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NUMERICAL SIMULATION OF THE DEVELOPMENT OF PERTURBATIONS INDUCED BY A PERIODIC HEAT SOURCE IN A SUPERSONIC BOUNDARY LAYER 超音速边界层中周期性热源引起的扰动发展的数值模拟
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050140
A. I. Kutepova, D. V. Khotyanovsky, A. A. Sidorenko
{"title":"NUMERICAL SIMULATION OF THE DEVELOPMENT OF PERTURBATIONS INDUCED BY A PERIODIC HEAT SOURCE IN A SUPERSONIC BOUNDARY LAYER","authors":"A. I. Kutepova,&nbsp;D. V. Khotyanovsky,&nbsp;A. A. Sidorenko","doi":"10.1134/S0021894423050140","DOIUrl":"10.1134/S0021894423050140","url":null,"abstract":"<p>Direct numerical simulation of interaction of a laminar boundary layer with a shock wave at a Mach number of 1.45 is performed. The influence of a periodic thermal source on the nature of this interaction is described.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"853 - 857"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475218","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
UNSTEADY AND QUASI-STEADY MODES OF THE FLOW OVER AN INTAKE TESTED IN A HOTSHOT WIND TUNNEL 在热风隧道中测试的进气口上方气流的非稳态和准稳态模式
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050127
Yu. P. Gounko, I. V. Kavun
{"title":"UNSTEADY AND QUASI-STEADY MODES OF THE FLOW OVER AN INTAKE TESTED IN A HOTSHOT WIND TUNNEL","authors":"Yu. P. Gounko,&nbsp;I. V. Kavun","doi":"10.1134/S0021894423050127","DOIUrl":"10.1134/S0021894423050127","url":null,"abstract":"<p>Results of a numerical simulation of an unsteady flow in an axisymmetric intake with internal compression tested in a hotshot wind tunnel with a fixed-volume settling chamber are discussed. The present simulations reveal the main features of various modes: unsteady processes of wind tunnel and intake starting, quasi-steady flow over the started intake with a supersonic flow velocity in the intake duct, and subsequent ulterior transition to the flow with a detached bow shock wave in front of the air intake with a subsonic flow velocity in the duct. A previously unknown mode of the flow over the intake with oscillating motion of the bow shock wave is observed. It is shown that oscillations decay with time, and the bow shock wave position in the incoming flow becomes stabilized at a certain distance from the leading edge of the intake with the test flow in the wind tunnel being preserved.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"827 - 839"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475228","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
FERROMAGNETIC-ENHANCED LOW-PRESSURE INDUCTIVE DISCHARGE FOR PLASMA PROCESSING 用于等离子体加工的铁磁增强型低压感应放电
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050036
M. V. Isupov, V. A. Pinaev
{"title":"FERROMAGNETIC-ENHANCED LOW-PRESSURE INDUCTIVE DISCHARGE FOR PLASMA PROCESSING","authors":"M. V. Isupov,&nbsp;V. A. Pinaev","doi":"10.1134/S0021894423050036","DOIUrl":"10.1134/S0021894423050036","url":null,"abstract":"<p>The generation of a low-frequency low-pressure inductive discharge with ferromagnetic enhancement of the magnetic coupling between the coil and the plasma is investigated. The main features and advantages of this plasma generation method for surface processing technologies are considered. New experimental data on the electrophysical and dynamic characteristics of ferromagnetic-enhanced low-pressure inductive discharge in argon with the addition of oxygen are presented. It is shown that the radial distribution of plasma parameters in a gas-discharge chamber can be controlled using distributed discharge generation. Significant fluctuations in the electron temperature during the discharge electric field period are found, and the mechanism of their occurrence is analyzed.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"757 - 766"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889063","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
STRUCTURING OF COPPER SURFACE BY GLOW DISCHARGE PLASMA 利用辉光放电等离子体对铜表面进行结构处理
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S002189442305005X
A. V. Petrova, A. I. Safonov
{"title":"STRUCTURING OF COPPER SURFACE BY GLOW DISCHARGE PLASMA","authors":"A. V. Petrova,&nbsp;A. I. Safonov","doi":"10.1134/S002189442305005X","DOIUrl":"10.1134/S002189442305005X","url":null,"abstract":"<p>This study demonstrates that the surface roughness of a copper sample can be controlled by treating it with glow discharge plasma. It is established that the main process affecting the morphology and composition of the surface is oxidation. Treatment causes the formation of various copper oxide nano- and microstructures on the surface of a copper sample. It is shown that, in the parameter range studied, the working gas pressure has a more significant effect on the formation of various structures than the glow discharge current density. As a result of the treatment, various stages of the surface oxidation are observed, caused by differences in the surface temperature.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"772 - 777"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475010","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-JET SYNTHESIS OF DIAMOND COATINGS ON SILICON SUBSTRATES FROM AN H2 + CH4 + Ar MIXTURE ACTIVATED IN A MICROWAVE DISCHARGE 在微波喷射器中激活的 H2 + CH4 + Ar 混合气喷射合成硅基体上的金刚石涂层
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050024
A. A. Emelyanov, M. Yu. Plotnilkov, N. I. Timoshenko, I. B. Yudin
{"title":"GAS-JET SYNTHESIS OF DIAMOND COATINGS ON SILICON SUBSTRATES FROM AN H2 + CH4 + Ar MIXTURE ACTIVATED IN A MICROWAVE DISCHARGE","authors":"A. A. Emelyanov,&nbsp;M. Yu. Plotnilkov,&nbsp;N. I. Timoshenko,&nbsp;I. B. Yudin","doi":"10.1134/S0021894423050024","DOIUrl":"10.1134/S0021894423050024","url":null,"abstract":"<p>The paper described further development of a gas-jet method of synthesizing diamond coatings with the use of a high-velocity jet for transporting the gas mixture (hydrogen, methane, and argon) activated in a microwave discharge to a silicon substrate. A substrate holder is developed, which ensures substrate integrity under thermal loading under conditions of chemical vapor deposition. The diamond synthesis rate in the present experiments is higher than that obtained previously in microwave plasma-assisted chemical vapor deposition experiments without addition of argon.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"748 - 756"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475115","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
EFFECT OF A LINEAR PARAMETER ON THE BRITTLE FRACTURE OF AN ELASTIC LAYER WITH A CIRCULAR HOLE 线性参数对带圆孔弹性层脆性断裂的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050164
V. V. Glagolev, A. A. Markin
{"title":"EFFECT OF A LINEAR PARAMETER ON THE BRITTLE FRACTURE OF AN ELASTIC LAYER WITH A CIRCULAR HOLE","authors":"V. V. Glagolev,&nbsp;A. A. Markin","doi":"10.1134/S0021894423050164","DOIUrl":"10.1134/S0021894423050164","url":null,"abstract":"<p>The effect of a hole radius in an elastic layer on a critical external load at the moment of the onset of fracture, determined by the energy criterion, is investigated. A free energy flow through an interaction arc is used as a fracture criterion to describe the dependence of a critical external load on a hole radius. The length of the interaction arc constructed in the vicinity of a free energy peak point is determined using a linear parameter. The introduced linear parameter for a polymethyl methacrylate layer is obtained using known experimental data. The maximum value of the linear parameter can be taken as a material constant.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"871 - 877"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475117","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
ULTRASONIC AND METALLOGRAPHIC STUDY OF THE HEAT-AFFECTED ZONE OF A CARBON STEEL WELDED JOINT UNDER PLASTIC DEFORMATION AND FATIGUE 塑性变形和疲劳条件下碳钢焊接接头热影响区的超声波和金相研究
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050218
A. V. Gonchar, A. A. Solov’ev
{"title":"ULTRASONIC AND METALLOGRAPHIC STUDY OF THE HEAT-AFFECTED ZONE OF A CARBON STEEL WELDED JOINT UNDER PLASTIC DEFORMATION AND FATIGUE","authors":"A. V. Gonchar,&nbsp;A. A. Solov’ev","doi":"10.1134/S0021894423050218","DOIUrl":"10.1134/S0021894423050218","url":null,"abstract":"<p>Failure of an St3sp steel sample under uniaxial tension and fatigue is studied using metallographic and ultrasonic pulse-echo techniques. Samples are cut out from a welded joint, particularly from a parent metal area and an incomplete recrystallization area in the heat-affected zone. The evolution of persistent slip bands in the heat-affected zone and those in the parent metal are subjected to a comparative analysis. A relationship between Poisson’s ratio determined by the ultrasonic method and the mechanical characteristics of the material is established. Methods for estimating the plasticity life under uniaxial tension and the number of cycles before fatigue failure are proposed.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"921 - 928"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475161","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
SIMULATION OF WETTABILITY OF NANOTEXTURED SURFACES BY MOLECULAR DYNAMICS 通过分子动力学模拟纳米纹理表面的润湿性
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-01-15 DOI: 10.1134/S0021894423050103
V. A. Andryushchenko, K. V. Artishevskii, D. V. Smovzh
{"title":"SIMULATION OF WETTABILITY OF NANOTEXTURED SURFACES BY MOLECULAR DYNAMICS","authors":"V. A. Andryushchenko,&nbsp;K. V. Artishevskii,&nbsp;D. V. Smovzh","doi":"10.1134/S0021894423050103","DOIUrl":"10.1134/S0021894423050103","url":null,"abstract":"<p>Wettability of textured surfaces of copper and carbon substrates is under study. It is revealed that the geometric parameters of the textures being created (e.g., depth and regularity) significantly affect the surface lyophilicity and the manner in which a water droplet spreads and moves. The contact angles obtained experimentally are consistent with the angles obtained via molecular dynamics simulations.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 5","pages":"814 - 820"},"PeriodicalIF":0.5,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475184","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
INITIATION OF ROTATION IN FLUID NEAR A FREE BOUNDARY 在靠近自由边界的流体中开始旋转
IF 0.6 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2023-10-26 DOI: 10.1134/S0021894423040089
V. A. Batishchev
{"title":"INITIATION OF ROTATION IN FLUID NEAR A FREE BOUNDARY","authors":"V. A. Batishchev","doi":"10.1134/S0021894423040089","DOIUrl":"10.1134/S0021894423040089","url":null,"abstract":"<p>A system of Navier–Stokes equations is used to calculate rotational modes of thermocapillary fluid flows in a semi-infinite space bounded from above by a non-deformable free boundary, with a local temperature distribution specified on it. It is shown that, near the free boundary in the boundary layer, bifurcation causes rotational modes of fluid flows as this boundary is unevenly cooled. Secondary rotational modes are calculated, which form two families of solutions that depend on several parameters, two of which are not determined by external conditions.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 4","pages":"628 - 634"},"PeriodicalIF":0.6,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910427","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
EFFECT OF THE NOZZLE—SURFACE DISTANCE ON HEAT TRANSFER DURING BOILING IN A FORCED LIQUID FLOW 强制液体流动沸腾过程中喷嘴-表面距离对传热的影响
IF 0.6 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2023-10-26 DOI: 10.1134/S0021894423040041
T. A. Gubanova, A. R. Zabirov, I. A. Molotova, V. A. Ryazantsev, V. V. Yangov
{"title":"EFFECT OF THE NOZZLE—SURFACE DISTANCE ON HEAT TRANSFER DURING BOILING IN A FORCED LIQUID FLOW","authors":"T. A. Gubanova,&nbsp;A. R. Zabirov,&nbsp;I. A. Molotova,&nbsp;V. A. Ryazantsev,&nbsp;V. V. Yangov","doi":"10.1134/S0021894423040041","DOIUrl":"10.1134/S0021894423040041","url":null,"abstract":"<p>This paper presents the results of experimental studies of cooling a zirconium ball in subcooled ethanol under the action of a submerged jet. The degree of subcooling of the cooled liquid and the distance from the nozzle exit to the cooled surface varies during the experiments. The heat patterns of cooling are presented and the effect of the distance between the nozzle and the surface on the duration of cooling and the transition temperature from stable film boiling to intense heat transfer is revealed.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 4","pages":"591 - 598"},"PeriodicalIF":0.6,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910430","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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