Thermophysics and Aeromechanics最新文献_第9页

Mathematical modeling of self-excited oscillations over the pitch of a conical-spherical body at Mach number M = 1.75 using the forced-oscillation hypothesis 利用强迫振荡假说对马赫数 M = 1.75 时锥球体俯仰自激振荡进行数学建模

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050086

E. A. Chasovnikov

引用次数: 0

Study of the transient gas outflow from a container 容器中瞬时气体流出研究

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050050

T. A. Gimon, V. I. Zvegintsev, N. N. Fedorova

引用次数: 0

The single-phase swirling flow simulation in a heat exchange channel with coolants counterflow at the operation parameters of PWR 压水堆运行参数下带有冷却剂逆流的热交换通道中的单相漩涡流模拟

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050025

S. M. Dmitriev, A. E. Sobornov, R. R. Ryazapov, A. V. Kotin, N. V. Matsin

{"title":"The single-phase swirling flow simulation in a heat exchange channel with coolants counterflow at the operation parameters of PWR","authors":"S. M. Dmitriev, A. E. Sobornov, R. R. Ryazapov, A. V. Kotin, N. V. Matsin","doi":"10.1134/S0869864323050025","DOIUrl":"10.1134/S0869864323050025","url":null,"abstract":"<div><p>The results of experimental and computational studies of the processes of hydrodynamics and heat transfer of a swirling flow, heated by the counter coolant flow in the heat exchange channel under standard technological parameters of a nuclear power plant are presented in this paper. The temperature field of the heat exchange channel as a whole and the coefficient of hydraulic resistance of channels with twisted tapes of a constant swirl pitch were obtained in experiments.</p><p>The numerical study was carried out using the domestic software package LOGOS and the Ansys CFX complex. The simulations were performed using the <i>k-ω</i> SST turbulence model, corrected for streamline curvature and rotation. Two versions of the calculation grid were developed. A comparative analysis of the calculated and experimental values of the hydraulic friction coefficient, the swirling flow temperature, and the heat transfer coefficients from the wall to the swirling flow was carried out. The analysis allowed identification of the strengths and weaknesses of the calculation methodology implemented in the domestic package. Deviations of the obtained values were compared. There is a good agreement between the calculated and experimental data, as well as with the data based on generalized dependences. One of the most important conclusions of the study is the need to modernize the process of solving the coupled heat transfer problem in the LOGOS package to expand the range of problems to be solved.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"809 - 817"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772387","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 heat losses in the temperature transducer in measurements in hotshot wind tunnels 热风隧道测量中温度传感器热损失的影响

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050074

I. S. Tsyryulnikov, T. A. Korotaeva, A. A. Maslov

{"title":"Effect of heat losses in the temperature transducer in measurements in hotshot wind tunnels","authors":"I. S. Tsyryulnikov, T. A. Korotaeva, A. A. Maslov","doi":"10.1134/S0869864323050074","DOIUrl":"10.1134/S0869864323050074","url":null,"abstract":"<div><p>The study is aimed at measuring the gas flow temperature by thermocouples whose time of reaching the equilibrium temperature is comparable with the measurement time, and heat release to structural elements of the transducer can be rather large. The results of numerical simulations of the gas flow in the temperature transducer used for measuring the stagnation temperature in high-enthalpy hotshot wind tunnels are presented. A coupled problem of the air flow around the temperature transducer is solved, and the flow field inside the stagnation chamber is calculated with allowance for heat losses to input wires and structural elements of the transducer. The data obtained are considered as the results of a virtual experiment and are treated by methods of experimental aerodynamics. The retrieved results are compared with the initial numerical values of the stagnation temperature in the flow impinging onto the transducer. The sources of uncertainties arising in temperature measurements are determined, and the applicability of experimental methods for determining the stagnation temperature in short-duration wind tunnels, including those with parameters decreasing during the run, is justified.</p><p>It is shown that the method of “two thermocouples” can be successfully used to determine the stagnation temperature even if the heat losses to transducer elements are comparable with heat input from the gas flow. The values of the retrieved stagnation temperature correspond to the flow temperature in the transducer within 1.2–3 % depending on the initial temperature of the thermocouple.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"893 - 902"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772600","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 the laser welding of porous and monolithic metallic plates 多孔金属板和整体金属板的激光焊接模拟

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050128

V. N. Popov, A. N. Cherepanov

引用次数: 0

Formation of a separation vortex in the vicinity of a dihedral corner configuration at M∞ = 2.27 and α ≤ 6° 在 M∞ = 2.27 和 α ≤ 6° 的二面角构型附近形成分离漩涡

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050013

A. I. Maksimov, I. N. Kavun

引用次数: 0

An OpenFOAM-based evaluation of various wall treatment strategies in simulating separated flows past bluff bodies with heat transfer 基于 OpenFOAM 的各种壁面处理策略评估，用于模拟流经崖体的分离流和热传导

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050049

K. Chakraborty, S. Saroha, S. S. Sinha, S. Lakshmipathy

{"title":"An OpenFOAM-based evaluation of various wall treatment strategies in simulating separated flows past bluff bodies with heat transfer","authors":"K. Chakraborty, S. Saroha, S. S. Sinha, S. Lakshmipathy","doi":"10.1134/S0869864323050049","DOIUrl":"10.1134/S0869864323050049","url":null,"abstract":"<div><p>The effect of wall treatment on the performance of <i>k-ε</i> model in incompressible, turbulent, separated flows with and without heat transfer has been evaluated in this study. We have simulated two benchmark cases: (i) flow past a circular cylinder at Re = 3900, and (ii) flow past a heated square cylinder at Re = 21 400 using the open source CFD package: OpenFOAM. We have compared three variants of the <i>k-ε</i> model, namely, Launder-Sharma <i>k-ε</i> model (Yap corrected) (LSKEY), Lam–Bremhorst <i>k-ε</i> model (Yap corrected) (LBKEY) and two-layer <i>k-ε</i> model (TLKE) along with the available experimental and direct numerical simulation (DNS) data. Comparisons are made in terms of the models’ capability to predict the mean flow variables, surface integral quantities, and heat transfer characteristics at different wake locations. On the basis of the presented study, we conclude that LSKEY performs better than the other models in predicting the wake and surface flow and heat transfer parameters. Further our comparisons show that, while LSKEY and LBKEY require comparable clock time per flow-through cycle, the computational time needed by TLKE is almost twice as compared to LBKEY or LSKEY. These results call for more attention from the CFD community onto the LSKEY model, in particular, so that it can be incorporated in various other flow fields, especially the scale resolving methodologies like the partially-averaged Navier-Stokes (PANS) equations, wherein a superior wall treatment along with a shorter computational time could be of immense advantage. In authors’ opinion, these benefits of the LSKEY model have largely been overlooked, perhaps because of a biased preference to the TLKE model, which enjoys the default presence in popular commercial CFD packages.</p></div>","PeriodicalId":800,"journal":{"name":"Thermophysics and Aeromechanics","volume":"30 5","pages":"835 - 856"},"PeriodicalIF":0.5,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139772725","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

Solubility of crystalline tricosane in supercritical CO2 and CO2 + cosolvents 晶体三元烷在超临界二氧化碳和二氧化碳+共溶剂中的溶解度

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050141

I. Sh. Khabriev, L. Yu. Sabirova, I. Z. Salikhov, L. Yu. Yarullin, V. F. Khairutdinov, T. R. Bilalov, I. M. Abdulagatov

引用次数: 0

Thermophysical and physicochemical basis for hydrogen production in compact energy systems of low-carbon economy 低碳经济紧凑型能源系统制氢的热物理和物理化学基础

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S086986432305013X

V. V. Kuznetsov, O. A. Gasenko

引用次数: 0

Thermal boundary conditions at the fluid–solid interface in the case of a conducting body: a novel thermal lattice Boltzmann analysis 导电体流固界面的热边界条件：新型热晶格玻尔兹曼分析法

IF 0.5 4区工程技术

Thermophysics and Aeromechanics Pub Date : 2024-02-13 DOI: 10.1134/S0869864323050062

Y. Dahani, A. Amahmid, M. Hasnaoui, S. Hasnaoui, A. El Mansouri, I. Filahi

引用次数: 0