Journal of Applied Mechanics and Technical Physics最新文献

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NUMERICAL SIMULATION OF THE GAS DYNAMICS OF NITROGEN JETS EXHAUSTING INTO A RAREFIED SPACE 氮气射流排入稀薄空间的气体动力学数值模拟

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060068

A. V. Zaitsev, L. V. Yarkov

Abstract

A nitrogen jet expanding during its exhaustion from a nozzle into a vacuum chamber is numerically simulated by a hybrid approach. The flow parameters in the nozzle and in the near field of the jet are determined by solving the Navier–Stokes equations by using the ANSYS Fluent software. The gas flow at large distances from the nozzle exit is modeled by the Direct Simulation Monte Carlo method by using the SMILE software system. Such an approach makes it possible to perform sufficiently accurate simulations in the near field of the jet; moreover, the temperature nonequilibrium of the expanding gas jet and other effects of rarefaction in the far field of the jet are taken into account. The approach is verified by using various approximate analytical models of gas exhaustion into vacuum. A comparison of the numerical results with available experimental data shows that they are in good agreement.

摘要采用混合方法对氮气射流从喷嘴排入真空室时的膨胀过程进行了数值模拟。喷嘴和射流近场的流动参数是通过使用 ANSYS Fluent 软件求解 Navier-Stokes 方程确定的。距离喷嘴出口较远的气体流动则通过 SMILE 软件系统的直接模拟蒙特卡洛法进行建模。这种方法可以对射流近场进行足够精确的模拟；此外，还考虑了膨胀气体射流的温度非平衡以及射流远场的其他稀释效应。通过使用气体排入真空的各种近似分析模型，对该方法进行了验证。将数值结果与现有的实验数据进行比较后发现，两者非常吻合。

引用次数: 0

USING A LEADER SAMPLE TO PREDICT THE CREEP AND LONG-TERM STRENGTH OF A MATERIAL DURING DUCTILE FRACTURE 利用引线样品预测材料在韧性断裂过程中的蠕变和长期强度

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060238

V. P. Radchenko, E. A. Afanaseva, M. N. Saushkin

Abstract

A method is developed for predicting creep and long-term strength based on the behavior of a previously tested sample (leader sample, prototype) in the case of ductile fracture. It is assumed that a loaded material does not undergo instantaneous plastic deformation and the first stage of creep. The incompressibility hypothesis is fulfilled in this case. It is shown that, if a constant-stress creep curve and the time to fracture are known for a leader sample, then obtaining a diagram of rheological deformation and long-term strength of the material at other stress values requires knowing only the initial (at the initial time) minimum creep strain rate of the samples for these stress values. The relevance of the developed method is checked with experimental data in two types of tests. The first type is tension tests of 12Kh18N10T corrosion-resistant steel samples at a temperature of 850°C and titanium alloy samples at a temperature of 600°C and the second type is tension and torsion tests of D16T alloy samples at a temperature of 250°C. It is shown that the prediction results are independent of the choice of a leader sample from many samples tested at different stresses. The possibility of using the developed method in experimental studies of creep of materials until their fracture is discussed.

摘要根据先前测试过的样品（领导样品、原型）在韧性断裂情况下的行为，开发了一种预测蠕变和长期强度的方法。假定加载材料不发生瞬时塑性变形和第一阶段蠕变。在这种情况下，不可压缩性假设成立。研究表明，如果已知领导样品的恒定应力蠕变曲线和断裂时间，那么只需知道这些应力值下样品的初始（初始时间）最小蠕变应变率，就能获得其他应力值下材料的流变变形和长期强度图。通过两类试验的实验数据检验了所开发方法的相关性。第一种是温度为 850°C 的 12Kh18N10T 耐腐蚀钢样品和温度为 600°C 的钛合金样品的拉伸试验，第二种是温度为 250°C 的 D16T 合金样品的拉伸和扭转试验。结果表明，预测结果与在不同应力下测试的多个样品中选择一个领导样品无关。讨论了在材料蠕变直至断裂的实验研究中使用所开发方法的可能性。

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引用次数: 0

TURBULENT STRUCTURE IN A FREE BUBBLY JET: AN ANALYSIS OF HIGHER-ORDER STATISTICAL MOMENTS OF VELOCITY FLUCTUATIONS 自由气泡喷流中的湍流结构：速度波动的高阶统计矩分析

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s002189442306010x

A. S. Severin, M. V. Timoshevskiy, B. B. Ilyushin, K. S. Pervunin

Abstract

This paper presents the results of a statistical analysis of turbulent structure in a free bubbly jet at a Reynolds number of 12 500 based on PIV measurements of the carrier-phase velocity. Distributions of higher-order statistical moments for velocity fluctuations (coefficients of skewness and excess) and the turbulence energy spectra for single-phase and gas-saturated jets were obtained after statistical filtering of instantaneous velocity fields. The influence of the dispersed phase (bubbles with an average diameter of 0.8 mm) with a volumetric gas fraction of 0, 1, 2, and 3% on the specified characteristics of the continuous phase was analyzed.

摘要本文介绍了根据载流相速度的 PIV 测量结果对雷诺数为 12 500 的自由气泡射流中的湍流结构进行统计分析的结果。在对瞬时速度场进行统计过滤后，获得了速度波动的高阶统计矩分布（偏度系数和过剩系数）以及单相和气体饱和射流的湍流能量谱。分析了气体体积分数为 0、1、2 和 3% 的分散相（平均直径为 0.8 毫米的气泡）对连续相特定特性的影响。

引用次数: 0

EXPERIMENTAL METHOD FOR STUDYING THE INTERACTION PROCESSES OF HIGH-VELOCITY IMPACTORS WITH MULTILAYER TRANSPARENT ARMOR 研究高速撞击器与多层透明装甲相互作用过程的实验方法

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060226

V. V. Fedyai, V. V. Selivanov, A. V. Petyukov

Abstract

An experimental method is developed that makes it possible to visualize the onset and spreading of damage in each layer of transparent armor. The damage development dynamics in multilayer packages consisting of four (480times 480)-mm layers and eight (300times 300)-mm layers is analyzed. The evolution of damage is obtained under the influence of a 12.7-mm bullet with a two-component core with a total mass of 59.2 g and a 7.62-mm bullet with a two-component core with a total mass of 10.9 g along the normal and at an acute angle in a range of impact velocities of 777–797 m/s. The experimental data are compared with the numerical simulation of interaction between an impactor and a multilayer transparent target.

摘要开发了一种实验方法，可以直观地观察透明装甲每一层中损伤的开始和扩展。分析了由四层（480乘以480）-mm层和八层（300乘以300）-mm层组成的多层装甲的损伤发展动态。在总质量为 59.2 g 的 12.7 毫米双组分弹芯子弹和总质量为 10.9 g 的 7.62 毫米双组分弹芯子弹沿法线和锐角的影响下，在 777-797 m/s 的撞击速度范围内，获得了损伤的演变过程。实验数据与撞击器与多层透明目标之间相互作用的数值模拟进行了比较。

引用次数: 0

DRAG COEFFICIENT OF A CYLINDER WITH A FLAT PLATE PLACED BEHIND IT 后面有平板的圆柱体的阻力系数

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060081

V. A. Frolov, Le Van Ha

Abstract

A passive method for reducing the drag of a cylinder by placing a flat plate behind it at a Reynolds number Re=10⁵ has been studied. The paper presents the results of an ANSYS Fluent simulation of the flow around a cylinder–plate system, including the velocity and pressure fields, streamlines, and the dependences of the drag coefficient and the position of the separation point on the surface of the cylinder on the relative length of the plate. It has been found that the drag coefficient of the cylinder–plate system can be reduced by approximately 40% compared to the case of an isolated cylinder.

摘要研究了在雷诺数 Re=105 条件下，通过在气缸后面放置一块平板来减少气缸阻力的被动方法。论文介绍了 ANSYS Fluent 对圆柱体-平板系统周围流动的模拟结果，包括速度场和压力场、流线、阻力系数以及圆柱体表面分离点位置与平板相对长度的关系。研究发现，与孤立的气缸相比，气缸-板系统的阻力系数可降低约 40%。

引用次数: 0

NUMERICAL ANALYSIS OF INTERACTION BETWEEN A SOLITARY WAVE AND A RECTANGULAR FIXED SEMI-SUBMERGED STRUCTURE 孤波与矩形固定半潜结构相互作用的数值分析

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060159

O. I. Gusev, V. S. Skiba, G. S. Khakimzyanov, L. B. Chubarov

Abstract

This paper describes a numerical simulation within the framework of a two-dimensional shallow water model of interaction of a solitary wave with a steady rectangular semi-submerged structure. The results of this study are compared with the results of calculations based on a model of irrotational three-dimensional flows, and it is shown that the simulation accuracy at small incident wave amplitudes is satisfactory. It is also revealed that, the solitary wave diffraction on the cylinder surface is neglected when using a one-dimensional shallow water model, then the maximum values of wave runup on the edge of the cylinder and the force loads on it become overestimated.

摘要本文介绍了在二维浅水模型框架内对孤波与稳定矩形半潜结构相互作用的数值模拟。研究结果与基于非旋转三维流模型的计算结果进行了比较，结果表明，在入射波幅较小的情况下，模拟精度令人满意。研究还发现，在使用一维浅水模型时，如果忽略了圆柱体表面的孤波衍射，那么圆柱体边缘的波浪上升最大值和其上的力载荷就会被高估。

引用次数: 0

SIMULATION OF DELAMINATION OF STEEL PIPES UNDER COMPLEX LOADING 模拟复杂载荷下的钢管分层

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060184

V. D. Kurguzov

Abstract

The formation of a mixed-type (fracture modes I and II) internal crack in a pipe wall that is made of an ideal elastoplastic material under the action of combined tensile (compression) and bending loads is described. The fracture of such materials is illustrated using a modified Leonov–Panasyuk–Dugdale model, which additionally uses the parameter of fracture process zone diameter. Another case under consideration is complex loading during which the crack path becomes curved, so its bend angle is determined using a force integral criterion based on the stress field asymptotics in the vicinity of the crack tip. Critical fracture parameters are obtained using a two-parameter (dual) strength criterion in the case of a complex stress state. The parameters included in the resulting analytical model are analyzed. The dimensionless geometric parameters of the structure are obtained numerically using the finite element method. Quasibrittle fracture diagrams are constructed.

摘要阐述了理想弹塑性材料管壁在拉伸（压缩）和弯曲联合载荷作用下形成混合型（断裂模式 I 和 II）内部裂缝的情况。使用修改后的 Leonov-Panasyuk-Dugdale 模型说明了此类材料的断裂情况，该模型还使用了断裂过程区直径参数。考虑的另一种情况是复杂加载，在这种情况下，裂纹路径变得弯曲，因此其弯曲角度是根据裂纹尖端附近应力场渐近线的力积分准则确定的。在复杂应力状态下，使用双参数（双重）强度准则获得临界断裂参数。对分析模型中的参数进行了分析。结构的无量纲几何参数是通过有限元法数值求得的。构建了准脆性断裂图。

引用次数: 0

SMALL ICING WIND TUNNEL BASED AT THE KHRISTIANOVICH INSTITUTE OF THEORETICAL AND APPLIED MECHANICS OF THE SIBERIAN BRANCH OF THE RUSSIAN ACADEMY OF SCIENCES 俄罗斯科学院西伯利亚分院克里斯蒂安诺维奇理论与应用力学研究所的小型结冰风洞

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060111

Yu. M. Prikhodko, A. A. Sidorenko, A. S. Shmakov, A. M. Shevchenko, A. M. Sorokin, A. A. Bogdanov, A. N. Shiplyuk

Abstract

A description of a small icing wind tunnel designed for studying the icing processes at the Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences is presented. The use of such a wind tunnel offers a possibility not only of studying the physical features of the icing process, but also of testing methods of anti-icing control, validating numerical methods used for calculating the icing processes, etc.

摘要介绍了俄罗斯科学院西伯利亚分院克里斯蒂安诺维奇理论和应用力学研究所为研究结冰过程而设计的小型结冰风洞。使用这种风洞不仅可以研究结冰过程的物理特征，还可以测试防冰控制方法、验证用于计算结冰过程的数值方法等。

引用次数: 0

GENERATION OF STREAMWISE STRUCTURES BY EXTERNAL VORTICAL AND THERMAL WAVES 外部涡流和热波产生的流向结构

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060123

S. A. Gaponov

Abstract

Streamwise structures generated by external vortical and thermal waves in subsonic and supersonic boundary layers have been studied. Particular attention is paid to the formulation of the boundary conditions at the outer edge of the boundary layer. It has been found that the disturbances of the boundary-layer streamwise velocities can be several times larger than the amplitude of the external vortical wave. The generation efficiency decreases with increasing Mach number. It has been shown that the influence of thermal external waves on the boundary-layer flow structure is much weaker than the influence of the vortex structure of the flow.

摘要研究了亚音速和超音速边界层中外部涡流和热波产生的流向结构。研究特别关注边界层外缘边界条件的制定。研究发现，边界层流向速度的扰动可能比外部涡旋波的振幅大几倍。生成效率随着马赫数的增加而降低。研究表明，热外力波对边界层流动结构的影响远远弱于流动涡旋结构的影响。

引用次数: 0

COOLING AND CRYSTALLIZATION OF MOLTEN ALUMINUM ALLOY DROPS IN WATER 熔融铝合金滴在水中的冷却和结晶

IF 0.6 4区工程技术 Q4 Engineering

Journal of Applied Mechanics and Technical Physics

Pub Date : 2024-02-13 DOI: 10.1134/s0021894423060019

M. V. Zharov

Abstract

The physical processes of crystallization of melt drops in water were studied using the drop granulation and melt centrifugation methods. A mathematical model was developed to determine the cooling and crystallization rates and structural dendritic parameter for aluminum alloy granules based on the initial data of the process, the diameter of melt drops, and cooling conditions. Predicting the dendritic parameter of the microstructure of granules makes it possible to predict the level of microstructure dispersion and hence the strength properties of the granulate material. The model parameters take into account the drop speed, features of heat removal processes, and the temperature dependence of the thermophysical parameters of the media. An application program implementing the developed mathematical model was developed. The developed mathematical model was implemented using the Microsoft Visual C++ programming language. The mathematical model was tested for the granulation of high-alloyed aluminum alloys (D1 and D16 alloys of the Al–Cu–Mg system, and B95 and B96Ts alloys of the Al–Zn–Mg–Cu system) obtained by centrifugal melt spraying and the drop method with cooling in water. Crystallization rate in full-scale samples was measured based on an analysis of the structural dendritic parameter of the material. Analysis of the calculated values of the dendritic parameter and its measurements for real granule samples shows good convergence of the simulation and measurement results.

摘要采用熔滴造粒法和熔体离心法研究了熔滴在水中结晶的物理过程。根据该过程的初始数据、熔滴直径和冷却条件，建立了一个数学模型来确定铝合金颗粒的冷却和结晶速率以及结构树枝状参数。通过预测颗粒微观结构的树枝状参数，可以预测微观结构的分散程度，进而预测颗粒材料的强度特性。模型参数考虑到了落料速度、散热过程的特征以及介质热物理参数的温度依赖性。我们开发了一个应用软件来实现所开发的数学模型。所开发的数学模型使用 Microsoft Visual C++ 编程语言实现。该数学模型针对高合金铝合金（铝-铜-镁体系的 D1 和 D16 合金，以及铝-锌-镁-铜体系的 B95 和 B96Ts 合金）的造粒进行了测试，这些合金是通过离心熔融喷涂法和在水中冷却的滴落法获得的。全尺寸样品的结晶速率是根据材料的树枝状结构参数分析测得的。对树枝状参数的计算值和实际颗粒样品的测量值进行的分析表明，模拟和测量结果趋同性良好。

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引用次数: 0

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