Thermophysics and Aeromechanics最新文献_第10页

Dynamic compliance of viscoelastic coatings used for drag reduction 用于减阻的粘弹性涂层的动态顺应性

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030059

V. M. Kulik

{"title":"Dynamic compliance of viscoelastic coatings used for drag reduction","authors":"V. M. Kulik","doi":"10.1134/S0869864325030059","DOIUrl":"10.1134/S0869864325030059","url":null,"abstract":"<div><p>The paper describes the response of a viscoelastic layer glued onto a solid base to a non-stationary convective pressure wave. A complete equation of motion of coating material particles in the case of two-dimensional deformations is derived and it takes into account the viscosity of the medium. A system of equations for calculating the longitudinal and transverse dynamic compliance, determined by the ratio of the displacement components to the applied pressure, is obtained. The derived equations allow the description of not only stationary oscillations of the coating, but also the process of their stabilization. It is noted that, in addition to viscosity and Poisson ratio, stationary and dynamic compliances depend only on two parameters: the ratio of the disturbance wave velocity to the propagation velocity of shear oscillations in the coating and the ratio of the wavelength to the coating thickness. An example of calculating stationary compliance for a typical case of a silicone rubber coating is given. Attention is drawn to the need to take into account the transition period of the forced oscillation stabilization, since the coating cannot oscillate instantly due to inertia and viscosity. Known attempts to calculate this process have been analyzed.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 3","pages":"579 - 589"},"PeriodicalIF":0.6,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147872382","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

Aerodynamic investigation of banking effect on a blended wing body at low speeds 混合翼身低速倾斜效应的气动研究

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030187

S. Mohan, P. Kumar

{"title":"Aerodynamic investigation of banking effect on a blended wing body at low speeds","authors":"S. Mohan, P. Kumar","doi":"10.1134/S0869864325030187","DOIUrl":"10.1134/S0869864325030187","url":null,"abstract":"<div><p>The Blended Wing Body (BWB) aircraft design holds promise for enhanced passenger capacity and improved fuel efficiency. This study rigorously investigates the aerodynamic performance of BWB aircraft, with a particular focus on lift, drag, and the impact of banking angles. Both experimental and computational methods were utilized to evaluate how banking angles affect BWB aerodynamics. The experimental study was conducted in an open-circuit wind tunnel with a 9:1 contraction ratio, while computational analysis was performed using FLUENT CFD software. Results demonstrate that the BWB configuration maintains effective lift even at elevated roll angles, though flow dynamics over the wings were disrupted during high-angle turns, with span-wise flow shift observed from port to starboard. Additionally, variations in lift and drag coefficients in response to banking angles produced significant effects on the BWB’s aerodynamic performance, with notable changes in normalized flow velocity at 0.2C height. The study highlights the underlying flow physics of the BWB configuration and confirms the consistency between experimental and computational results, validating the robustness of the findings.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 3","pages":"749 - 770"},"PeriodicalIF":0.6,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147872407","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 a sweeping jet on the flow structure in a slot channel with flow blockage 扫流射流对流阻槽内流动结构的影响

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030096

M. V. Shestakov

引用次数: 0

On effectiveness of introducing the homobaricity concept in a study of bubble behavior in liquid 在液体气泡行为研究中引入均匀性概念的有效性

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030023

N. S. Khabeev

引用次数: 0

Features of the flow structure in the mixing chamber of the Coanda ejector Coanda喷射器混合室流动结构的特点

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030072

O. Yu. Otmakhov, M. A. Pakhomov, N. P. Skibina, I. A. Chohar, V. I. Terekhov

{"title":"Features of the flow structure in the mixing chamber of the Coanda ejector","authors":"O. Yu. Otmakhov, M. A. Pakhomov, N. P. Skibina, I. A. Chohar, V. I. Terekhov","doi":"10.1134/S0869864325030072","DOIUrl":"10.1134/S0869864325030072","url":null,"abstract":"<div><p>The experimental results on the study of the flow structure and pressure distributions on the wall and along the axis of the Coanda ejector mixing chamber are presented. The experiments were carried out in the range of changes in the absolute value of the total pressure in the prechamber <i>P</i><sub>K</sub> = 1.2 – 3.5 atm, which corresponded to both sub- and supercritical jet outflow regimes. The width of the annular gap through which the ejector flow was blown into the mixing chamber took the values <i>h</i> = 0.15, 0.25 and 0.5 mm. An increase in the vacuum on the wall in the initial part of the nozzle was observed with an increase in the total pressure. It was found that the static pressure distributions along the nozzle axis are characterized by the presence of a vacuum region almost along the entire length of the cylindrical channel. At subcritical jet outflows, recirculation zones can form in the vicinity of the channel axis near its inlet. A fundamentally different character of the velocity distribution and pulsation intensity in the cross section of the mixing chamber is noted, depending on the outflow regimes.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 3","pages":"609 - 622"},"PeriodicalIF":0.6,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147872255","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

Density of CeAl2 and NdAl2 intermetallic compounds in solid and liquid states 固体和液体状态下CeAl2和NdAl2金属间化合物的密度

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030163

S. V. Stankus, R. A. Khairulin

引用次数: 0

Heat transfer and hydraulic losses in a channel with spherical intensifiers during circulation of a non-azeotropic alcohol-water mixture 非共沸酒精-水混合物循环过程中带有球形增强剂的通道内的传热和水力损失

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S086986432503014X

V. E. Zhukov, N. N. Mezentseva

引用次数: 0

Determination of emissivity dependence on wavelength using a hybrid least squares method for non-contact temperature measurements 非接触式温度测量用混合最小二乘法测定发射率与波长的关系

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030151

P. V. Zinin, P. A. Grishaev, K. M. Bulatov

引用次数: 0

Heat dissipation study of AHRPM motor for electric vehicles 电动汽车AHRPM电机散热研究

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030205

H. G. Gao, C. H. Zhao, Z. H. Cao

{"title":"Heat dissipation study of AHRPM motor for electric vehicles","authors":"H. G. Gao, C. H. Zhao, Z. H. Cao","doi":"10.1134/S0869864325030205","DOIUrl":"10.1134/S0869864325030205","url":null,"abstract":"<div><p>To address insulation aging and permanent magnet demagnetization caused by high temperatures during permanent magnet motor operation, it is essential to study the motor’s cooling and heat dissipation structure. This paper takes an asymmetric hybrid rotor structure permanent magnet synchronous motor with a peak power of 60 kW as an example. First, the losses at different rotational speeds during the weak magnetic control process are investigated. Next, the temperature rise of each component is compared in Fluent when different cooling channels are used during the weak magnetic acceleration process, and the optimal channel structure is selected. Further research is conducted for the 12 000 rpm operating condition, which has the highest heat dissipation demand, comparing the temperature rise of the windings and the pressure differential of the water channel at different water injection flow rates, to select the optimal flow rate. To address the insufficient cooling of the end windings by the water-cooled structure alone, an air-cooled structure is added for simulation. The results show that adding the air-cooled structure effectively alleviates the high temperature problem of the end windings in the permanent magnet motor and also provides good cooling and heat dissipation for the rotor and permanent magnet parts.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"32 3","pages":"785 - 800"},"PeriodicalIF":0.6,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147872383","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 modeling of propagation of a turbulent jet flowing from a slot into a confined space 湍流射流从狭缝进入密闭空间的数值模拟

IF 0.6 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2026-05-12 DOI: 10.1134/S0869864325030084

M. A. Zasimova, N. G. Ivanov, V. V. Ris, E. D. Stepasheva

引用次数: 0