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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 0.5 4区 工程技术
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
{"title":"TURBULENT STRUCTURE IN A FREE BUBBLY JET: AN ANALYSIS OF HIGHER-ORDER STATISTICAL MOMENTS OF VELOCITY FLUCTUATIONS","authors":"A. S. Severin,&nbsp;M. V. Timoshevskiy,&nbsp;B. B. Ilyushin,&nbsp;K. S. Pervunin","doi":"10.1134/S002189442306010X","DOIUrl":"10.1134/S002189442306010X","url":null,"abstract":"<p>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.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1011 - 1014"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751717","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
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 0.5 4区 工程技术
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
{"title":"EXPERIMENTAL METHOD FOR STUDYING THE INTERACTION PROCESSES OF HIGH-VELOCITY IMPACTORS WITH MULTILAYER TRANSPARENT ARMOR","authors":"V. V. Fedyai,&nbsp;V. V. Selivanov,&nbsp;A. V. Petyukov","doi":"10.1134/S0021894423060226","DOIUrl":"10.1134/S0021894423060226","url":null,"abstract":"<p>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 <span>(480times 480)</span>-mm layers and eight <span>(300times 300)</span>-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.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1108 - 1118"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751851","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
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 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060081
V. A. Frolov, Le Van Ha
{"title":"DRAG COEFFICIENT OF A CYLINDER WITH A FLAT PLATE PLACED BEHIND IT","authors":"V. A. Frolov,&nbsp;Le Van Ha","doi":"10.1134/S0021894423060081","DOIUrl":"10.1134/S0021894423060081","url":null,"abstract":"<p>A passive method for reducing the drag of a cylinder by placing a flat plate behind it at a Reynolds number Re=10<sup>5</sup> 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.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"993 - 999"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889000","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 DELAMINATION OF STEEL PIPES UNDER COMPLEX LOADING 模拟复杂载荷下的钢管分层
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060184
V. D. Kurguzov
{"title":"SIMULATION OF DELAMINATION OF STEEL PIPES UNDER COMPLEX LOADING","authors":"V. D. Kurguzov","doi":"10.1134/S0021894423060184","DOIUrl":"10.1134/S0021894423060184","url":null,"abstract":"<p>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.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1078 - 1089"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751629","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
BENDING OF A THIN PLATE IN A HIGH PRESSURE FIELD 薄板在高压场中的弯曲
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060214
M. A. Ilgamov
{"title":"BENDING OF A THIN PLATE IN A HIGH PRESSURE FIELD","authors":"M. A. Ilgamov","doi":"10.1134/S0021894423060214","DOIUrl":"10.1134/S0021894423060214","url":null,"abstract":"<p>A linear theory of static cylindrical bending of a thin plate is constructed without using the Kirchhoff hypotheses. Transverse shear, thickness compression, and the resulting longitudinal force are taken into account. In view of changes in the areas of both surfaces during bending, the transverse distributed force is determined. It is assumed that the average pressure on the plate is several orders of magnitude greater than the pressure difference. Bending is considered under the conditions of a plane strain state and a stress state.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1100 - 1107"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751712","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
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 0.5 4区 工程技术
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
{"title":"NUMERICAL ANALYSIS OF INTERACTION BETWEEN A SOLITARY WAVE AND A RECTANGULAR FIXED SEMI-SUBMERGED STRUCTURE","authors":"O. I. Gusev,&nbsp;V. S. Skiba,&nbsp;G. S. Khakimzyanov,&nbsp;L. B. Chubarov","doi":"10.1134/S0021894423060159","DOIUrl":"10.1134/S0021894423060159","url":null,"abstract":"<p>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.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1046 - 1057"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752011","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
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 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060123
S. A. Gaponov
{"title":"GENERATION OF STREAMWISE STRUCTURES BY EXTERNAL VORTICAL AND THERMAL WAVES","authors":"S. A. Gaponov","doi":"10.1134/S0021894423060123","DOIUrl":"10.1134/S0021894423060123","url":null,"abstract":"<p>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.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1025 - 1035"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751714","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 TYPE OF A PLANE PROBLEM FOR A THIN ELASTOPLASTIC ADHESIVE LAYER ON (J) INTEGRAL VALUES 弹塑性薄粘合层平面问题的类型对 $$j$$ 积分值的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060196
V. E. Bogacheva, V. V. Glagolev, L. V. Glagolev, A. A. Markin
{"title":"EFFECT OF THE TYPE OF A PLANE PROBLEM FOR A THIN ELASTOPLASTIC ADHESIVE LAYER ON (J) INTEGRAL VALUES","authors":"V. E. Bogacheva,&nbsp;V. V. Glagolev,&nbsp;L. V. Glagolev,&nbsp;A. A. Markin","doi":"10.1134/S0021894423060196","DOIUrl":"10.1134/S0021894423060196","url":null,"abstract":"<p>This paper describes a study of deformation of an ideal elastoplastic adhesive layer of a sample in the form of an elastic double-cantilever beam. The <span>(J)</span> integral values are determined for a number of adhesives with account for all diagonal stress tensor components in the layer. It is shown that the <span>(J)</span> integral value is significantly affected by the plane problem type in the case where an elastic-plastic model of layer deformation is applied. As demonstrated in the study, compressive stresses may be present during normal fracture in the irreversible deformation region of the adhesive in a plane stressed state.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"1090 - 1096"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751852","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 SUBSTRATE PREHEATING ON THE CERMET COATING STRUCTURE OBTAINED USING ADDITIVE TECHNOLOGIES 基底预热对使用添加剂技术获得的金属陶瓷涂层结构的影响
IF 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060032
I. S. Gertsel, V. M. Fomin, M. A. Gulov, A. G. Malikov, A. A. Filippov
{"title":"EFFECT OF SUBSTRATE PREHEATING ON THE CERMET COATING STRUCTURE OBTAINED USING ADDITIVE TECHNOLOGIES","authors":"I. S. Gertsel,&nbsp;V. M. Fomin,&nbsp;M. A. Gulov,&nbsp;A. G. Malikov,&nbsp;A. A. Filippov","doi":"10.1134/S0021894423060032","DOIUrl":"10.1134/S0021894423060032","url":null,"abstract":"<p>This paper is devoted to the influence of substrate preheating on the structure of cermet coatings made of TI–6AL–4V alloy reinforced with B<sub>4</sub>C particles using direct metal deposition. Coatings with a 15% mass fraction of B<sub>4</sub>C were obtained for the first time. It is shown that substrate preheating makes it possible to produce cermet coatings without cracks. In tribological tests, the wear scar volume of the cermet coating decreased by a factor of eight compared to the coating with a 10% mass fraction of B<sub>4</sub>C.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"959 - 963"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139751867","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
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 0.5 4区 工程技术
Journal of Applied Mechanics and Technical Physics Pub Date : 2024-02-13 DOI: 10.1134/S0021894423060019
M. V. Zharov
{"title":"COOLING AND CRYSTALLIZATION OF MOLTEN ALUMINUM ALLOY DROPS IN WATER","authors":"M. V. Zharov","doi":"10.1134/S0021894423060019","DOIUrl":"10.1134/S0021894423060019","url":null,"abstract":"<p>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.</p>","PeriodicalId":608,"journal":{"name":"Journal of Applied Mechanics and Technical Physics","volume":"64 6","pages":"943 - 953"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752020","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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