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SPECIFIC FEATURES OF FORMATION OF SUPERSONIC JETS OF RAREFIED GASES UNDER CONDITIONS OF DEVELOPED CONDENSATION 在发达冷凝条件下稀薄气体超音速喷流形成的具体特征
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050085
K. A. Dubrovin, A. E. Zarvin, A. K. Rebrov
{"title":"SPECIFIC FEATURES OF FORMATION OF SUPERSONIC JETS OF RAREFIED GASES UNDER CONDITIONS OF DEVELOPED CONDENSATION","authors":"K. A. Dubrovin,&nbsp;A. E. Zarvin,&nbsp;A. K. Rebrov","doi":"10.1134/S0021894423050085","DOIUrl":"10.1134/S0021894423050085","url":null,"abstract":"<p>Specific features of gas flows exhausting from supersonic nozzles to a flooded medium under conditions of clusterization are considered. Radiation of particles in the flow is initiated by a well-focused high-voltage electron beam. Radiation is measured by a high-resolution camera and a spectrometer with a wide range of wavelengths. For characteristic sizes of jets of condensing gases in the entire range of examined stagnation pressures and background ambient space, it is possible to use the same dependence on the parameters as that in the case with a correction factor for taking into account the influence of condensation, which, in turn, depends on the cluster size. The form of the correction factor is presented. The dependence of the previously detected process of formation of a secondary external jet in flows of easily condensing gases (“cluster wake\") is studied. The reasons and conditions for the emergence of this effect are considered. The processes of formation of the traditional spindle-shaped jet and the new secondary jet are compared. The results of measurements of the diameters of the traditional and secondary jets in the maximum cross sections by means of photometry in various exhaust regimes are reported. The reasons for the differences in formation of the traditional and secondary jets under conditions of developed condensation of particles are considered. The “cluster wake\" is found to affect the process of gas penetration from the ambient space to the supersonic flow. Specific features of radiation of the particles of the “cluster wake\" are considered, and the time of existence of radiation in the excited state is estimated.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"793 - 804"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475123","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}
引用次数: 0
PREDICTION OF DURABILITY OF A FIBER BUNDLE UNDER UNIAXIAL TENSION ON THE BASIS OF THE THERMAL-FLUCTUATION MODEL OF ITS BRITTLE FRACTURE 根据纤维束脆性断裂的热波动模型预测纤维束在单轴拉力下的耐久性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S002189442305019X
V. V. Shevelev
{"title":"PREDICTION OF DURABILITY OF A FIBER BUNDLE UNDER UNIAXIAL TENSION ON THE BASIS OF THE THERMAL-FLUCTUATION MODEL OF ITS BRITTLE FRACTURE","authors":"V. V. Shevelev","doi":"10.1134/S002189442305019X","DOIUrl":"10.1134/S002189442305019X","url":null,"abstract":"<p>A model is proposed for assessing the durability of a bundle of identical fibers under brittle fracture in a tensile stress region located to the left of the Griffiths fracture threshold. It is shown that, in a specified stress range, the average durability and the dispersion of durability values increase indefinitely with a decreasing tensile stress. Estimates are obtained for the incubation period of durability, its confidence probability, and the lower limit of the number of elements of a bundle of identical fibers that guarantee the required durability of the bundle.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"902 - 910"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475224","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}
引用次数: 0
SUPERSONIC GAS FLOW FROM AN ANNULAR NOZZLE INTO A LOW-PRESSURE CHAMBER WITH AN AXIAL CHANNEL: KINETIC AND CONTINUUM SOLUTIONS 超音速气流从环形喷嘴进入带轴向通道的低压腔：动力学和连续体解决方案
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050097
A. A. Morozov, I. B. Yudin, A. G. Abramov, P. A. Skovorodko, R. G. Sharafutdinov
{"title":"SUPERSONIC GAS FLOW FROM AN ANNULAR NOZZLE INTO A LOW-PRESSURE CHAMBER WITH AN AXIAL CHANNEL: KINETIC AND CONTINUUM SOLUTIONS","authors":"A. A. Morozov,&nbsp;I. B. Yudin,&nbsp;A. G. Abramov,&nbsp;P. A. Skovorodko,&nbsp;R. G. Sharafutdinov","doi":"10.1134/S0021894423050097","DOIUrl":"10.1134/S0021894423050097","url":null,"abstract":"<p>Supersonic gas flow from an annular nozzle into a low-pressure chamber is studied numerically using kinetic and continuum approaches. Such flows find applications in gas-jet plasma-chemical technologies using an electron beam passing through an axial channel. The study is performed by using the direct simulation Monte Carlo method and by solving continuum equations using ANSYS Fluent software. It is shown that the solutions obtained are in good agreement with each other even in low-density regions of the electron beam channel. This leads to the conclusion that ANSYS Fluent software is suitable for simulating flows of this type.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"805 - 813"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139474955","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}
引用次数: 0
SHOT-PEENING-INDUCED RESIDUAL STRESSES IN POWDER COATINGS PRODUCED BY SPRAYING 喷涂生产的粉末涂料中由喷丸引起的残余应力
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050188
V. Yu. Ul’yanitskii, D. K. Rybin, A. Yu. Larichkin
{"title":"SHOT-PEENING-INDUCED RESIDUAL STRESSES IN POWDER COATINGS PRODUCED BY SPRAYING","authors":"V. Yu. Ul’yanitskii,&nbsp;D. K. Rybin,&nbsp;A. Yu. Larichkin","doi":"10.1134/S0021894423050188","DOIUrl":"10.1134/S0021894423050188","url":null,"abstract":"<p>In order to study the shot peening that occurs during the application of powder coatings, experiments are carried out on glass shot peening of steel test strips using a CCDS2000 detonation device. Experimental dependences of the shot peening depth <span>(delta)</span> and the residual stresses <span>(sigma)</span> in a hardened layer on treatment parameters (particle size, density, and velocity, as well as the strength of the test strip material) are obtained. Engineering equations are proposed for calculating the values of <span>(delta)</span> and <span>(sigma)</span>.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"890 - 901"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139474960","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}
引用次数: 0
ASYMPTOTIC ANALYSIS OF THE PROBLEM OF EQUILIBRIUM OF AN INHOMOGENEOUS BODY WITH HINGED RIGID INCLUSIONS OF VARIOUS WIDTHS 带有不同宽度铰链刚性夹杂物的非均质体平衡问题的渐近分析
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050206
N. P. Lazarev, V. A. Kovtunenko
{"title":"ASYMPTOTIC ANALYSIS OF THE PROBLEM OF EQUILIBRIUM OF AN INHOMOGENEOUS BODY WITH HINGED RIGID INCLUSIONS OF VARIOUS WIDTHS","authors":"N. P. Lazarev,&nbsp;V. A. Kovtunenko","doi":"10.1134/S0021894423050206","DOIUrl":"10.1134/S0021894423050206","url":null,"abstract":"<p>Two models are considered, which describe the equilibrium state of an inhomogeneous two-dimensional body with two connected rigid inclusions. The first model corresponds to an elastic body with two-dimensional rigid inclusions located in regions with a constant width (curvilinear rectangle and trapezoid). The second model involves thin inclusions described by curves. In both models, it is assumed that there is a crack described by the same curve on the interface between the elastic matrix and rigid inclusions. The crack boundaries are subjected to a one-sided condition of non-penetration. The dependence of the solutions of equilibrium problems on the width of two-dimensional inclusions is studied. It is shown that the solutions of equilibrium problems in the presence of two-dimensional inclusions in a strong topology are reduced to the solutions of problems for thin inclusions with the width parameter tending to zero.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"911 - 920"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475156","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}
引用次数: 0
FREE VIBRATION ANALYSIS OF A BIDIRECTIONAL FUNCTIONALLY GRADED CARBON NANOTUBE REINFORCED COMPOSITE BEAM 双向功能分级碳纳米管增强复合梁的自由振动分析
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050176
M. Pang, S. M. Zhou, B. L. Hu, Y. Q. Zhang
{"title":"FREE VIBRATION ANALYSIS OF A BIDIRECTIONAL FUNCTIONALLY GRADED CARBON NANOTUBE REINFORCED COMPOSITE BEAM","authors":"M. Pang,&nbsp;S. M. Zhou,&nbsp;B. L. Hu,&nbsp;Y. Q. Zhang","doi":"10.1134/S0021894423050176","DOIUrl":"10.1134/S0021894423050176","url":null,"abstract":"<p>Based on the Timoshenko beam theory, the vibration properties of a bidirectional functionally graded carbon nanotube reinforced composite beam are investigated. The governing equation of free vibration for the composite beam is derived, which considers the main influential factors, such as the gradient index and the distribution, aspect ratio, and volume ratio of carbon nanotubes. The differential quadrature method is used to solve the governing equation. The natural frequency of the composite beam is obtained. It is found that the natural frequency and vibration mode shapes of the beam are dependent upon the gradient index, nanotube distribution, and volume ratio of nanotubes. However, it should be pointed out that the nanotube distribution in the height direction and the volume ratio of nanotubes have very limited effects on the mode shapes of the composite beam.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"878 - 889"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475182","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}
引用次数: 0
GAS AND GAS–DROPLET JET FLOWS INTO VACUUM 气体和气体-液滴喷射流进入真空
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050073
V. N. Yarygin, V. G. Prikhodko, I. V. Yarygin
{"title":"GAS AND GAS–DROPLET JET FLOWS INTO VACUUM","authors":"V. N. Yarygin,&nbsp;V. G. Prikhodko,&nbsp;I. V. Yarygin","doi":"10.1134/S0021894423050073","DOIUrl":"10.1134/S0021894423050073","url":null,"abstract":"<p>This paper presents a brief review of the experimental studies carried out at the Kutateladze Institute of Thermophysics of the Siberian Branch of the USSR Academy of Sciences to investigate the gas dynamics of low-density supersonic jets, including the design and construction of a vacuum gas-dynamic complex, the development of electron beam and laser methods diagnostics, studies of the influence of viscosity and nonequilibrium effects on the region of free supersonic expansion and the shock-wave structure of underexpanded jets. Problems are considered, and examples of using vacuum facilities to model the force, thermal, and contamination effects of full-scale orientation thruster jets on the structural elements of spacecraft and orbital stations are presented.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"784 - 792"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475219","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}
引用次数: 0
DESIGN AND EXPERIMENTAL ANALYSIS OF HEAT TRANSFER PERFORMANCE OF A TWO-PHASE CLOSED THERMOSYPHON SYSTEM 两相封闭式热虹吸系统传热性能的设计与实验分析
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050152
M. S. Elmosbahi, M. Hamdi, M. Hazami
{"title":"DESIGN AND EXPERIMENTAL ANALYSIS OF HEAT TRANSFER PERFORMANCE OF A TWO-PHASE CLOSED THERMOSYPHON SYSTEM","authors":"M. S. Elmosbahi,&nbsp;M. Hamdi,&nbsp;M. Hazami","doi":"10.1134/S0021894423050152","DOIUrl":"10.1134/S0021894423050152","url":null,"abstract":"<p>The aim of this research to assess the thermal performance of a locally developed two-phase closed thermosyphon system charged with methanol. The performance of the system is examined through experiments to determine the impact of changes in the electrical heat power, liquid charge, flow rate, inclination angle, and cooling water temperature on the output temperature. Temperatures at various points of the heat pipe, as well as cooling water, are recorded. Several fluid loadings are examined, ranging from 4 to 9 ml, which corresponds to the limits of the half full and overfilled evaporator. Different flow rates in the interval 0.2–0.7 kg/min, heat input in the interval 13.0–41.4 W, and cooling water temperature in the interval 15–35°C are considered. According to the findings, the ideal liquid fill ratio provides the best results in terms of the output temperature, and the heat transfer coefficient is between 64 and 71%. The impact of the adiabatic zone insulation on the temperature distribution along the heat pipe is illustrated.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"858 - 870"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888990","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}
引用次数: 0
INFLUENCE OF CURRENT DENSITY ON THE STRUCTURE OF AMORPHOUS SILICON SUBOXIDE THIN FILMS UNDER ELECTRON-BEAM ANNEALING 电子束退火条件下电流密度对非晶硅亚氧化物薄膜结构的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050061
E. A. Baranov, V. A. Nepomnyashchikh, V. O. Konstantinov, V. G. Shchukin, I. E. Merkulova, A. O. Zamchiy, N. A. Lunev, V. A. Volodin, A. A. Shapovalova
{"title":"INFLUENCE OF CURRENT DENSITY ON THE STRUCTURE OF AMORPHOUS SILICON SUBOXIDE THIN FILMS UNDER ELECTRON-BEAM ANNEALING","authors":"E. A. Baranov,&nbsp;V. A. Nepomnyashchikh,&nbsp;V. O. Konstantinov,&nbsp;V. G. Shchukin,&nbsp;I. E. Merkulova,&nbsp;A. O. Zamchiy,&nbsp;N. A. Lunev,&nbsp;V. A. Volodin,&nbsp;A. A. Shapovalova","doi":"10.1134/S0021894423050061","DOIUrl":"10.1134/S0021894423050061","url":null,"abstract":"<p>Electron-beam annealing of an amorphous silicon suboxide thin film with a stoichiometric coefficient of 0.5 was carried out in a vacuum chamber. The exposure time was 10 min at an accelerating electron-beam voltage of 1000 V and a current strength of 75 mA. Using probe measurements and calculations, the current density distribution over the electron-beam cross section was obtained assuming a normal distribution. The current density on the beam axis was 0.8 mA/mm<sup>2</sup>. The electron-beam annealing of the amorphous silicon suboxide thin film led to the formation of crystalline silicon nanoparticles with a size of <span>((4.1pm 0.1))</span> nm. The crystallite sizes did not depend on the electron-beam current density, in contrast to the degree of crystallinity, which decreased from 40% on the beam axis to zero (amorphous structure) on the periphery. It is suggested that during the formation of nanocrystalline silicon, a liquid phase is formed.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"778 - 783"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139474958","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}
引用次数: 0
MEASUREMENT OF SILICON MELT TEMPERATURE DURING ELECTRON BEAM REFINING 在电子束精炼过程中测量硅熔体温度
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050048
V. G. Shchukin, V. O. Konstantinov
{"title":"MEASUREMENT OF SILICON MELT TEMPERATURE DURING ELECTRON BEAM REFINING","authors":"V. G. Shchukin,&nbsp;V. O. Konstantinov","doi":"10.1134/S0021894423050048","DOIUrl":"10.1134/S0021894423050048","url":null,"abstract":"<p>A method for measuring the temperature of the silicon melt during plasma-chemical electron-beam refining is proposed. The method is based on measuring the radiation intensity from the melt in the infrared range and comparing it with the temperature. It is established that changing the refining conditions, in particular, the electron beam current allows a controlled change in the temperature refined silicon from 1500 K to 2600 K.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"767 - 771"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139474975","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}
引用次数: 0
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