Volume 38, Number 2, April 2020
|Page(s)||261 - 270|
|Published online||17 July 2020|
Flow-Heat Conjugate Numerical Simulation Based on the Time-Domain Method
Shengyang Aircraft Design and Research Institute, Shenyang 110035, China
2 School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
For the popups of the applicability of the time-domain based unsteady flow-heat coupling numerical simulation method in physical problems with time-period characteristic, the cases of the plate convection heat transfer and the hollow blunt-nosed blade with periodic hot spots were conducted through the internal CFD code namely HGFS. The unsteady results are analysed both in the time——domain and the frequency-domain and the main conclusions are as follows:the numerical simulation results of the plate convection heat transfer indicate that the time-scale of heat convention in the fluid domain is 10-3 s order of magnitude, while that of heat conduction in solid domain is seconds. Thus, the disparity of time scale may lead to a sharp increase in the amount of calculation, and even lead to failure of the calculation method based on time-domain. The unsteady numerical simulation of the simplified turbine blade with hot spots shows that, when the sweep frequency increases to 5 times of the original, the first-order amplitude of the temperature wave in the blade decreases to 50.4%, from 0.343 K to 0.173 K, and the corresponding penetration depth decreases to 42.8%, from 5.21 mm to 2.23 mm. The temperature fluctuation amplitude and penetration depth reduce significantly with the increasing of frequency.
为研究基于时间推进的非定常流-热耦合数值模拟方法在具有时间周期性特征的物理问题中的适用性，利用课题组HGFS程序平台完成了平板对流换热以及带有周期性热斑的空心钝头叶片等算例的数值模拟，并在时域和频域范畴对非定常计算结果进行了深入分析，得到的主要结论如下：平板对流换热的数值模拟结果表明，流体域热对流的时间尺度为10-3 s量级，而固体域热传导的时间尺度为秒的量级，时间尺度的差异可能会导致计算量急剧增加，甚至使基于时间推进的计算方法失效；对简化涡轮叶片的非定常计算表明，热斑的扫过频率增加到原来的5倍时，叶片内部温度波的一阶幅值减小为原来的50.4%，由0.343 K减小到0.173 K，而渗透深度减小为原来的42.8%，由5.21 mm减小到2.23 mm，频率的增加会使温度波动幅值和渗透深度显著降低。
Key words: unsteady / flow-heat conjugate / time-domain / CFD
关键字 : 非定常 / 流-热耦合 / 时域 / 计算流体力学
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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