Pub Date : 2019-04-05DOI: 10.33257/phchgd.20.1.816
Y. Tunik
The work continues research on stabilization of detonation combustion of hydrogen-air mixtures entering axisymmetric convergent-divergent nozzles with high supersonic speed. The possibility of thrust generation under atmospheric conditions at heights of up to 30 km is numerically stud-ied. Hydrogen-air mixture flow modeling is carried out on the basis of non-stationary two-dimensional equations of an inviscid multi-component gas with chemical transformations. Cal-culations are performed on the basis of S.K. Godunov is of the first order of accuracy, as well as its modification, which increases the approximation order of smooth solutions to the second in spatial variables. It is shown the possibility of stable detonative combustion of hydrogen-air mixtures at altitudes up to 30 km (see figure below) at Mach number of oncoming flow of 7 up to 9. The configuration of suitable axisymmetric convergent-divergent nozzle and a central co-axial body is determined.
{"title":"Numerical simulation of hydrogen detonative combustion in a convergent-divergent nozzle with a central body","authors":"Y. Tunik","doi":"10.33257/phchgd.20.1.816","DOIUrl":"https://doi.org/10.33257/phchgd.20.1.816","url":null,"abstract":"The work continues research on stabilization of detonation combustion of hydrogen-air mixtures entering axisymmetric convergent-divergent nozzles with high supersonic speed. The possibility of thrust generation under atmospheric conditions at heights of up to 30 km is numerically stud-ied. Hydrogen-air mixture flow modeling is carried out on the basis of non-stationary two-dimensional equations of an inviscid multi-component gas with chemical transformations. Cal-culations are performed on the basis of S.K. Godunov is of the first order of accuracy, as well as its modification, which increases the approximation order of smooth solutions to the second in spatial variables. It is shown the possibility of stable detonative combustion of hydrogen-air mixtures at altitudes up to 30 km (see figure below) at Mach number of oncoming flow of 7 up to 9. The configuration of suitable axisymmetric convergent-divergent nozzle and a central co-axial body is determined.","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125793486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-05DOI: 10.33257/PHCHGD.20.1.781
S. Popovich
{"title":"Aerodynamic cooling for supersonic wake flow behind a backward-facing step","authors":"S. Popovich","doi":"10.33257/PHCHGD.20.1.781","DOIUrl":"https://doi.org/10.33257/PHCHGD.20.1.781","url":null,"abstract":"","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123686185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-05DOI: 10.33257/phchgd.20.1.803
S. Alexandrov, A. G. Zdor, A. Kireev, S. Chernov, V. L. Yumashev
Based on two-dimensional full Navier ‒ Stokes equations the flow about stagnation point of spherically blunted body at hypersonic flight in the atmosphere of the Earth is investigated. The problem is being solved taking into account non-equilibrium physical-chemical processes (vibration relaxation, vibration-dissociation coupling, dissociation, chemical reactions, ionization). Convective heat fluxes at the stagnation point are compared to ones obtained using simplified engineering technique.
{"title":"Non-equilibrium high speed air flow over spherical blunt bodies","authors":"S. Alexandrov, A. G. Zdor, A. Kireev, S. Chernov, V. L. Yumashev","doi":"10.33257/phchgd.20.1.803","DOIUrl":"https://doi.org/10.33257/phchgd.20.1.803","url":null,"abstract":"Based on two-dimensional full Navier ‒ Stokes equations the flow about stagnation point of spherically blunted body at hypersonic flight in the atmosphere of the Earth is investigated. The problem is being solved taking into account non-equilibrium physical-chemical processes (vibration relaxation, vibration-dissociation coupling, dissociation, chemical reactions, ionization). Convective heat fluxes at the stagnation point are compared to ones obtained using simplified engineering technique.","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121752110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-05DOI: 10.33257/phchgd.20.1.796
I. Shirokov, T. Elizarova
The influence of 3D spatial grid structure on a quality of the numerical modeling of viscous compressible gas flow at Mach number equal to 3 near a forward-facing part of a rectangular cylinder is demonstrated. The obtained results show that the grid structure produces critical ef-fects on the shape and the intensity of the head shock wave, which can exceed the influence of other numerical effects. The calculations are performed using a finite volume method imple-mented for regularized or quasi-gasdynamic equations.
{"title":"On the influence of a spatial grid structure on numerical simulation of a shock wave in a flow around 3D model","authors":"I. Shirokov, T. Elizarova","doi":"10.33257/phchgd.20.1.796","DOIUrl":"https://doi.org/10.33257/phchgd.20.1.796","url":null,"abstract":"The influence of 3D spatial grid structure on a quality of the numerical modeling of viscous compressible gas flow at Mach number equal to 3 near a forward-facing part of a rectangular cylinder is demonstrated. The obtained results show that the grid structure produces critical ef-fects on the shape and the intensity of the head shock wave, which can exceed the influence of other numerical effects. The calculations are performed using a finite volume method imple-mented for regularized or quasi-gasdynamic equations.","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126087800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-05DOI: 10.33257/phchgd.20.1.812
V. A. Eroshin, A. V. Boyko
For a long time, the debate about the advisability of using rolling bodies on the surface of the water for transport purposes remained purely rhetorical, although the first patent was issued to D. Vanderburg in 1888 [1‒4]. However, in recent years, numerous cases of water skiing on buggies, snowmobiles and motorcycles [5, 6] make us think about the practical use of this idea. The article describes the conditions of water rolling of wheel systems with lugs, the modeling of this phenomenon is carried out, the dependences of the draft and bearing capacity of the wheels on the Froude number are obtained for a number of values of the dimensionless mass of the system, and the position of the boundary of the stable rolling region is estimated.
{"title":"New trends in the hydrodynamics of high-speed overwater systems","authors":"V. A. Eroshin, A. V. Boyko","doi":"10.33257/phchgd.20.1.812","DOIUrl":"https://doi.org/10.33257/phchgd.20.1.812","url":null,"abstract":"For a long time, the debate about the advisability of using rolling bodies on the surface of the water for transport purposes remained purely rhetorical, although the first patent was issued to D. Vanderburg in 1888 [1‒4]. However, in recent years, numerous cases of water skiing on buggies, snowmobiles and motorcycles [5, 6] make us think about the practical use of this idea. The article describes the conditions of water rolling of wheel systems with lugs, the modeling of this phenomenon is carried out, the dependences of the draft and bearing capacity of the wheels on the Froude number are obtained for a number of values of the dimensionless mass of the system, and the position of the boundary of the stable rolling region is estimated.","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127213423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-05DOI: 10.33257/PHCHGD.20.1.780
A. Gordeev, A. Chaplygin
{"title":"Experimental study of heat transfer between dissociated air flow and a flat plate at angle of attack in RF-plasmatron","authors":"A. Gordeev, A. Chaplygin","doi":"10.33257/PHCHGD.20.1.780","DOIUrl":"https://doi.org/10.33257/PHCHGD.20.1.780","url":null,"abstract":"","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114446636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-05DOI: 10.33257/PHCHGD.20.1.793
V. M. Azriel, V. Akimov, L. I. Kolesnikova, L. Rusin, M. Sevryuk
We propose a general impulsive model for scattering of a system of atoms or ions from a flat solid surface without tangential forces (that is, forces parallel to the surface). It is assumed within the framework of this model that each individual encounter of an atom with the surface is a series of elastic hits of the atom against surface pseudoparticles, the hits instantly following each other. A distinctive feature of the model is that to each atom, one assigns two infinite sequences of masses of pseudoparticles. Criteria for both finiteness and infinity of series of elastic hits are formulated, based on the masses of the pseudoparticles and the mass of the atom. The model is a far-reaching generalization of the well-known “hard-cube model” for scattering of atoms from a solid surface. We illustrate (by some simplest examples related to scattering of potassium iodide molecules) an application of the correlation analysis to the study of the dependence of the dynamical characteristics of the scattering on the masses of the surface pseudoparticles. The absence of tangential forces seems to be a substantial limitation of the model (for instance, the recent experimental data on scattering of KI from a diamond surface indicate that tangential forces play a significant role in this process).
{"title":"General impulsive models of scattering of molecules from a solid surface without tangential forces","authors":"V. M. Azriel, V. Akimov, L. I. Kolesnikova, L. Rusin, M. Sevryuk","doi":"10.33257/PHCHGD.20.1.793","DOIUrl":"https://doi.org/10.33257/PHCHGD.20.1.793","url":null,"abstract":"We propose a general impulsive model for scattering of a system of atoms or ions from a flat solid surface without tangential forces (that is, forces parallel to the surface). It is assumed within the framework of this model that each individual encounter of an atom with the surface is a series of elastic hits of the atom against surface pseudoparticles, the hits instantly following each other. A distinctive feature of the model is that to each atom, one assigns two infinite sequences of masses of pseudoparticles. Criteria for both finiteness and infinity of series of elastic hits are formulated, based on the masses of the pseudoparticles and the mass of the atom. The model is a far-reaching generalization of the well-known “hard-cube model” for scattering of atoms from a solid surface. We illustrate (by some simplest examples related to scattering of potassium iodide molecules) an application of the correlation analysis to the study of the dependence of the dynamical characteristics of the scattering on the masses of the surface pseudoparticles. The absence of tangential forces seems to be a substantial limitation of the model (for instance, the recent experimental data on scattering of KI from a diamond surface indicate that tangential forces play a significant role in this process).","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"19 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132792476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-02-11DOI: 10.33257/PHCHGD.19.4.750
S. Sarkisov, V. V. Ryabchenkov, V. Yusim, Raf K. Kalimullin, V. Mikhailov, Julia Shirokovskaya
The sorption method of inert gases deep purification from unwanted chemically active impurities is offered on an example of chemical reactions between components that make up air and Ca-Mg alkaline-earth alloy process investigation.
{"title":"Physico-chemical processes of interaction of the alkaline earth metal alloy with gaseous media","authors":"S. Sarkisov, V. V. Ryabchenkov, V. Yusim, Raf K. Kalimullin, V. Mikhailov, Julia Shirokovskaya","doi":"10.33257/PHCHGD.19.4.750","DOIUrl":"https://doi.org/10.33257/PHCHGD.19.4.750","url":null,"abstract":"The sorption method of inert gases deep purification from unwanted chemically active impurities is offered on an example of chemical reactions between components that make up air and Ca-Mg alkaline-earth alloy process investigation.","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131758444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-02-11DOI: 10.33257/PHCHGD.19.4.779
A. Chaplygin, A. Gordeev, A. Kolesnikov, V. Sakharov, S. A. Vasil’evskii
{"title":"Experimental and numerical study of thermal effect of catalysis on the surfaces of metals and quartz in underexpanded jets of dissociated air","authors":"A. Chaplygin, A. Gordeev, A. Kolesnikov, V. Sakharov, S. A. Vasil’evskii","doi":"10.33257/PHCHGD.19.4.779","DOIUrl":"https://doi.org/10.33257/PHCHGD.19.4.779","url":null,"abstract":"","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115502381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-02-11DOI: 10.33257/phchgd.19.4.762
E. Kustova, Maria A. Mekhonoshina
The aim of this work is to build an adequate model for calculating the bulk viscosity in carbon dioxide and to evaluate its contribution to the normal mean stress under various conditions. Bulk viscosity characterizes the finite time of energy exchange between the translational and internal degrees of freedom Bulk viscosity in carbon dioxide is considered in the one-temperature approximation devel-oped using the Chapman ‒ Enskog method taking into account the rotational and vibrational degrees of freedom, as well as complex mechanisms of vibrational relaxation including intra-and inter-mode vibrational energy transitions. Chemical reactions are not included to the model. Two models for the bulk viscosity coefficient in CO 2 are considered: the model based on the exact kinetic theory methods, as well as the model representing the bulk viscosity coefficient as a sum of independent contributions of rotational and vibrational degrees of freedom. The latter model predicts that in carbon dioxide at room temperature, the bulk viscosity coefficient may exceed that of shear viscosity by several orders of magnitude and, thus, make a significant contribution to the stress tensor. In this work, it is shown that the use of a consistent theoretical approach does not allow separating the bulk viscosity into independent rotational and vibrational contributions. Vibrational relaxation times are evaluated using different models.
{"title":"Features of Bulk Viscosity Simulation in Carbon Dioxide","authors":"E. Kustova, Maria A. Mekhonoshina","doi":"10.33257/phchgd.19.4.762","DOIUrl":"https://doi.org/10.33257/phchgd.19.4.762","url":null,"abstract":"The aim of this work is to build an adequate model for calculating the bulk viscosity in carbon dioxide and to evaluate its contribution to the normal mean stress under various conditions. Bulk viscosity characterizes the finite time of energy exchange between the translational and internal degrees of freedom Bulk viscosity in carbon dioxide is considered in the one-temperature approximation devel-oped using the Chapman ‒ Enskog method taking into account the rotational and vibrational degrees of freedom, as well as complex mechanisms of vibrational relaxation including intra-and inter-mode vibrational energy transitions. Chemical reactions are not included to the model. Two models for the bulk viscosity coefficient in CO 2 are considered: the model based on the exact kinetic theory methods, as well as the model representing the bulk viscosity coefficient as a sum of independent contributions of rotational and vibrational degrees of freedom. The latter model predicts that in carbon dioxide at room temperature, the bulk viscosity coefficient may exceed that of shear viscosity by several orders of magnitude and, thus, make a significant contribution to the stress tensor. In this work, it is shown that the use of a consistent theoretical approach does not allow separating the bulk viscosity into independent rotational and vibrational contributions. Vibrational relaxation times are evaluated using different models.","PeriodicalId":309290,"journal":{"name":"Physical-Chemical Kinetics in Gas Dynamics","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126527557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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