Pub Date : 2024-01-27DOI: 10.1134/s0015462823602152
V. V. Bulatov, I. Yu. Vladimirov
Abstract
The problem of constructing asymptotics of the internal gravity waves far fields arising from an pulsed localized source of perturbations in a stratified fluid of finite depth rotating as a whole is solved. In the approximation of constancy of the buoyancy frequency, uniform and nonuniform asymptotics of solutions are constructed to describe far wave fields, which are expressed in terms of the Airy function and its derivative. The exact and asymptotic results are compared, and it is shown that at times longer than several buoyancy periods and at distances on the order of the liquid-layer thickness, the obtained asymptotics allow one to describe the amplitude–phase structure of far wave fields.
{"title":"Far Fields Asymptotics of Internal Gravity Waves from a Pulse Localized Source in a Rotating Stratified Medium","authors":"V. V. Bulatov, I. Yu. Vladimirov","doi":"10.1134/s0015462823602152","DOIUrl":"https://doi.org/10.1134/s0015462823602152","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The problem of constructing asymptotics of the internal gravity waves far fields arising from an pulsed localized source of perturbations in a stratified fluid of finite depth rotating as a whole is solved. In the approximation of constancy of the buoyancy frequency, uniform and nonuniform asymptotics of solutions are constructed to describe far wave fields, which are expressed in terms of the Airy function and its derivative. The exact and asymptotic results are compared, and it is shown that at times longer than several buoyancy periods and at distances on the order of the liquid-layer thickness, the obtained asymptotics allow one to describe the amplitude–phase structure of far wave fields.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139585962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.1134/s0015462823602061
V. I. Melikhov, O. I. Melikhov, S. Bashar
Abstract
The regularities of the wave of the thermal interaction of water drops in high-temperature molten lead, i.e., a thermal-detonation wave, are studied. Due to the boiling of water on the surface of molten lead, both liquids (phases) are separated by a vapor film. A one-dimensional model of interacting and interpenetrating continua is used, which describes the dynamics of each fluid by introducing a special field characterized by its own velocity, temperature, and volume fraction. The wave velocity is set by the equality of phase velocities and temperatures in the Chapman–Jouguet plane. The parameters at the pressure peak are calculated from the conditions at the discontinuity which are the boundary conditions for integrating the conservation equations in the area of interaction between water droplets and the melt. The resulting structure of the thermal-detonation wave is characterized by the maximum pressure being located at some distance from the shock wave.
{"title":"Study of a Thermal Detonation Wave in a Mixture of Water Droplets and Molten Lead","authors":"V. I. Melikhov, O. I. Melikhov, S. Bashar","doi":"10.1134/s0015462823602061","DOIUrl":"https://doi.org/10.1134/s0015462823602061","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The regularities of the wave of the thermal interaction of water drops in high-temperature molten lead, i.e., a thermal-detonation wave, are studied. Due to the boiling of water on the surface of molten lead, both liquids (phases) are separated by a vapor film. A one-dimensional model of interacting and interpenetrating continua is used, which describes the dynamics of each fluid by introducing a special field characterized by its own velocity, temperature, and volume fraction. The wave velocity is set by the equality of phase velocities and temperatures in the Chapman–Jouguet plane. The parameters at the pressure peak are calculated from the conditions at the discontinuity which are the boundary conditions for integrating the conservation equations in the area of interaction between water droplets and the melt. The resulting structure of the thermal-detonation wave is characterized by the maximum pressure being located at some distance from the shock wave.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139586041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.1134/s0015462823602012
A. A. Ochirov, Yu. D. Chashechkin
Abstract
The influence of a surface electric charge on the character and properties of wave motion along the free surface of a viscous homogeneous fluid is investigated by analytical asymptotic methods. Expressions describing the dispersion relations of the wave-motion components are obtained. The phase and group velocities of the structures forming wave motion are determined.
{"title":"Wave Motion in a Viscous Homogeneous Fluid with a Surface Electric Charge","authors":"A. A. Ochirov, Yu. D. Chashechkin","doi":"10.1134/s0015462823602012","DOIUrl":"https://doi.org/10.1134/s0015462823602012","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The influence of a surface electric charge on the character and properties of wave motion along the free surface of a viscous homogeneous fluid is investigated by analytical asymptotic methods. Expressions describing the dispersion relations of the wave-motion components are obtained. The phase and group velocities of the structures forming wave motion are determined.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.1134/s0015462823602139
A. I. Grigor’ev, S. O. Shiryaeva, V. A. Koromyslov
Abstract
The physical regularities of implementing the electrostatic instability of a flat charged surface of a noncompressible viscous conducting liquid are considered for the case of a pool of finite dimensions where the spectrum of emerging capillary waves is discrete. The critical conditions for the onset of the electrostatic instability of an uncompressible viscous conductive liquid in a pool of finite dimensions are shown to coincide with those for a boundless surface of an infinitely deep ideal uncompressible liquid (coincide with the conditions for implementing Tonks–Frenkel instability). This makes it possible to experimentally verify the criterion for implementing Tonks–Frenkel instability using pools of finite dimensions without introducing qualitative errors.
{"title":"On Some Regularities in the Implementation of the Electrostatic Instability of a Charged Liquid Surface in a Pool of Finite Dimensions","authors":"A. I. Grigor’ev, S. O. Shiryaeva, V. A. Koromyslov","doi":"10.1134/s0015462823602139","DOIUrl":"https://doi.org/10.1134/s0015462823602139","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The physical regularities of implementing the electrostatic instability of a flat charged surface of a noncompressible viscous conducting liquid are considered for the case of a pool of finite dimensions where the spectrum of emerging capillary waves is discrete. The critical conditions for the onset of the electrostatic instability of an uncompressible viscous conductive liquid in a pool of finite dimensions are shown to coincide with those for a boundless surface of an infinitely deep ideal uncompressible liquid (coincide with the conditions for implementing Tonks–Frenkel instability). This makes it possible to experimentally verify the criterion for implementing Tonks–Frenkel instability using pools of finite dimensions without introducing qualitative errors.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.1134/s0015462823602024
Yu. N. Grigoryev, I. V. Ershov
Abstract
For a plane flow of a vibrationally excited dissociating diatomic gas the necessary conditions of the existence of growing (neutral) inviscid perturbations, similar to the Rayleigh criterion of a “generalized” inflection point, are obtained. The corresponding formulas are presented for cases with a certain physical interpretation. In particular, the model of a vibrationally excited one-component gas is considered as the initial stage of thermal dissociation, as well as a widespread model with one dissociation-recombination reaction. The case of a binary molecular-atomic mixture with a vibrationally excited molecular component and a frozen gas-phase dissociation-recombination reaction is considered as an intermediate one. Comparative numerical calculations are carried out, which show, in particular, that under conditions of developed dissociation, the use of the criterion of the generalized inflection point does not take into account the specifics of the process. The wavenumbers and phase velocities of the I and II inviscid modes calculated on its basis may differ significantly from the results obtained with using the new necessary condition.
摘要 对于振动激发解离二原子气体的平面流动，得到了存在增长（中性）不粘性扰动的必要条件，类似于 "广义 "拐点的瑞利准则。针对具有一定物理解释的情况，给出了相应的公式。特别是，将振动激发的单组分气体模型视为热解离的初始阶段，以及具有一个解离-重组反应的广泛模型。二元分子-原子混合物的振动激发分子成分和冻结气相解离-重组反应的情况被视为中间阶段。进行了比较数值计算，结果特别表明，在解离发达的条件下，使用广义拐点标准没有考虑到过程的特殊性。在此基础上计算出的 I 和 II 不粘性模态的波数和相速度可能与使用新的必要条件得出的结果有很大差异。
{"title":"Necessary Conditions for the Development of Inviscid Instabilities in a Vibrationally Excited Dissociating Gas","authors":"Yu. N. Grigoryev, I. V. Ershov","doi":"10.1134/s0015462823602024","DOIUrl":"https://doi.org/10.1134/s0015462823602024","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>For a plane flow of a vibrationally excited dissociating diatomic gas the necessary conditions of the existence of growing (neutral) inviscid perturbations, similar to the Rayleigh criterion of a “generalized” inflection point, are obtained. The corresponding formulas are presented for cases with a certain physical interpretation. In particular, the model of a vibrationally excited one-component gas is considered as the initial stage of thermal dissociation, as well as a widespread model with one dissociation-recombination reaction. The case of a binary molecular-atomic mixture with a vibrationally excited molecular component and a frozen gas-phase dissociation-recombination reaction is considered as an intermediate one. Comparative numerical calculations are carried out, which show, in particular, that under conditions of developed dissociation, the use of the criterion of the generalized inflection point does not take into account the specifics of the process. The wavenumbers and phase velocities of the I and II inviscid modes calculated on its basis may differ significantly from the results obtained with using the new necessary condition.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139586038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-26DOI: 10.1134/s0015462823600955
V. G. Lushchik, M. S. Makarova, S. S. Popovich
Abstract
Variations in the turbulent Schmidt and Prandtl numbers in the boundary layer on a wall with film cooling when helium is injected into xenon flow through a porous insert is investigated numerically using the three-parameter RANS turbulence model supplemented with transport equations for turbulent heat and mass transfer. The results obtained are compared with calculated data for constant turbulent Schmidt and Prandtl numbers.
{"title":"Turbulent Schmidt and Prandtl Numbers in the Boundary Layer on a Wall with Film Cooling when a Foreign Gas is Injected through a Porous Insert","authors":"V. G. Lushchik, M. S. Makarova, S. S. Popovich","doi":"10.1134/s0015462823600955","DOIUrl":"https://doi.org/10.1134/s0015462823600955","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Variations in the turbulent Schmidt and Prandtl numbers in the boundary layer on a wall with film cooling when helium is injected into xenon flow through a porous insert is investigated numerically using the three-parameter RANS turbulence model supplemented with transport equations for turbulent heat and mass transfer. The results obtained are compared with calculated data for constant turbulent Schmidt and Prandtl numbers.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-26DOI: 10.1134/s0015462823601304
S. A. Isaev, A. G. Sudakov, D. V. Nikushchenko, V. B. Kharchenko, L. P. Iunakov
Abstract
The effect of the boundary conditions of the first and second kind on the predicted characteristics of anomalous heat transfer intensification in the case of turbulent low-velocity air flow over an inclined groove in the hot wall of a narrow channel is numerically investigated. It is shown that the isothermality conditions lead to a considerable underestimation of the thermal efficiency of a surface structured with narrow grooves, compared with the conditions of heat flux constancy.
{"title":"The Effect of Boundary Conditions on the Modeling of Anomalous Intensification of Turbulent Heat Transfer in an Inclined Groove in the Wall of a Narrow Channel","authors":"S. A. Isaev, A. G. Sudakov, D. V. Nikushchenko, V. B. Kharchenko, L. P. Iunakov","doi":"10.1134/s0015462823601304","DOIUrl":"https://doi.org/10.1134/s0015462823601304","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The effect of the boundary conditions of the first and second kind on the predicted characteristics of anomalous heat transfer intensification in the case of turbulent low-velocity air flow over an inclined groove in the hot wall of a narrow channel is numerically investigated. It is shown that the isothermality conditions lead to a considerable underestimation of the thermal efficiency of a surface structured with narrow grooves, compared with the conditions of heat flux constancy.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139586046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-26DOI: 10.1134/s0015462823601985
S. T. Surzhikov
Abstract
The electrodynamic structure of an anomalous glow discharge between two plane electrodes located on the surface of a sharp plate in supersonic flow of molecular nitrogen is studied numerically in a wide range of Mach numbers using a modified ambipolar model of quasi-neutral electric-discharge plasma. The ambipolar diffusion coefficient and the effective ionization rate are modified while taking into account the external magnetic field. The problem is solved in the two-dimensional x–y formulation, when the external magnetic field strength is directed in the positive or negative direction of the z axis. The parameters of anomalous glow discharge are numerically studied in the pressure range p = 0.14–5 Torr and the voltage drops on the quasineutral current column of discharge plasma V = 30–320 V. The main problem parameters which make it possible to obtain a reasonable agreement with the available experimental data are determined.
摘要 利用改进的准中性放电等离子体的伏极模型，对分子氮超音速流中位于尖板表面的两个平面电极之间的异常辉光放电的电动力学结构进行了数值研究。在考虑到外部磁场的情况下，修改了伏极扩散系数和有效电离率。当外部磁场强度指向 z 轴的正方向或负方向时，问题以二维 x-y 形式求解。对压力范围 p = 0.14-5 托和放电等离子体准中性电流柱上的电压降 V = 30-320 V 的反常辉光放电参数进行了数值研究。
{"title":"Supersonic Flow past a Sharp Plate with Surface Anomalous Glow Discharge in a Magnetic Field","authors":"S. T. Surzhikov","doi":"10.1134/s0015462823601985","DOIUrl":"https://doi.org/10.1134/s0015462823601985","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The electrodynamic structure of an anomalous glow discharge between two plane electrodes located on the surface of a sharp plate in supersonic flow of molecular nitrogen is studied numerically in a wide range of Mach numbers using a modified ambipolar model of quasi-neutral electric-discharge plasma. The ambipolar diffusion coefficient and the effective ionization rate are modified while taking into account the external magnetic field. The problem is solved in the two-dimensional <i>x–y</i> formulation, when the external magnetic field strength is directed in the positive or negative direction of the <i>z</i> axis. The parameters of anomalous glow discharge are numerically studied in the pressure range <i>p</i> = 0.14–5 Torr and the voltage drops on the quasineutral current column of discharge plasma <i>V</i> = 30–320 V. The main problem parameters which make it possible to obtain a reasonable agreement with the available experimental data are determined.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139586773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-26DOI: 10.1134/s0015462823601894
A. V. Garbaruk, B. N. Dan’kov, A. A. Dyad’kin, A. P. Kosenko, M. V. Mikhailov, S. P. Rybak, M. Kh. Strelets, M. L. Shur
Abstract
We present the results of an analysis of flows in a gap between the reentry vehicle of a manned spacecraft and the propulsion bay located behind it in the case of their separation due to an emergency situation of the rocket in the active region of its trajectory. Emphasis is placed on different-in-nature oscillation processes occurring in transonic flight regimes. An approach to the estimation of the regimes of self-oscillation existence and their frequencies is proposed on the basis of the problem geometry and the flow conditions.
{"title":"Investigation of Self-Oscillation Processes Occurring between a Reentry Vehicle and the Propulsion Bay of a Manned Spacecraft in the Case of Emergency Separation","authors":"A. V. Garbaruk, B. N. Dan’kov, A. A. Dyad’kin, A. P. Kosenko, M. V. Mikhailov, S. P. Rybak, M. Kh. Strelets, M. L. Shur","doi":"10.1134/s0015462823601894","DOIUrl":"https://doi.org/10.1134/s0015462823601894","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We present the results of an analysis of flows in a gap between the reentry vehicle of a manned spacecraft and the propulsion bay located behind it in the case of their separation due to an emergency situation of the rocket in the active region of its trajectory. Emphasis is placed on different-in-nature oscillation processes occurring in transonic flight regimes. An approach to the estimation of the regimes of self-oscillation existence and their frequencies is proposed on the basis of the problem geometry and the flow conditions.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-26DOI: 10.1134/s0015462823601389
L. R. Shaidullin, S. A. Fadeev
Abstract
The effect of acoustic low-intensity oscillations in a homogeneous tube and in a tube with a conical extension is experimentally investigated for the same resonator volumes. The resonator shape is shown to have an effect on the oscillation spectrum and intensity and the pressure wave shape at constant values of the resonance frequency and the piston displacement amplitude. An increase in the resonator Q-factor is observable, when the resonator has a conical extension. An accelerated aerosol sedimentation in tubes is revealed in the case of acoustic oscillation with the resonance frequency. In the presence of a conical extension the aerosol drop concentration is reduced by a factor of 1.2 more rapidly than in the case of a uniform tube and three times more rapidly as compared with natural sedimentation. The results obtained can be used for increasing the efficiency of acoustic methods of gas purification from the disperse phase.
{"title":"Effect of a Conical Extension on Aerosol Sedimentation in the Case of Acoustic Small-Amplitude Oscillations in a Tube","authors":"L. R. Shaidullin, S. A. Fadeev","doi":"10.1134/s0015462823601389","DOIUrl":"https://doi.org/10.1134/s0015462823601389","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The effect of acoustic low-intensity oscillations in a homogeneous tube and in a tube with a conical extension is experimentally investigated for the same resonator volumes. The resonator shape is shown to have an effect on the oscillation spectrum and intensity and the pressure wave shape at constant values of the resonance frequency and the piston displacement amplitude. An increase in the resonator Q-factor is observable, when the resonator has a conical extension. An accelerated aerosol sedimentation in tubes is revealed in the case of acoustic oscillation with the resonance frequency. In the presence of a conical extension the aerosol drop concentration is reduced by a factor of 1.2 more rapidly than in the case of a uniform tube and three times more rapidly as compared with natural sedimentation. The results obtained can be used for increasing the efficiency of acoustic methods of gas purification from the disperse phase.</p>","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140886476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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