湍流模型对瞬态流固耦合换热数值模拟影响分析

采用ANSYS Fluent程序建立了固体加热功率指数增长的气体冷却模型，分析了瞬态过程中的流动传热特性，通过数值模拟结果与3组实验数据进行对比，研究了标准k-ε模型、标准k-ω模型、过渡SST模型和RSM模型4种典型湍流模型对瞬态过程中流固耦合换热数值模拟结果的影响。通过分析发现：热负载指数提升过程中，热功率一部分用于对流换热，而另一部分仍留在固体内，且热功率提升速率越高，对流换热的占比越低；采用不同湍流模型模拟出的等效表面热流密度均低于实验值，且采用ε类湍流模型的模拟结果与实验数据更接近。

Effect of Turbulence Model on Rapid Transient Fluid-solid Coupled Heat Transfer

The ANSYS Fluent was employed to establish the gas cooling and solid heating with power exponential growth model, and the characteristics of transient flow and heat transfer were analyzed. The numerical simulation results employing four typical turbulence models including standard k-ε model, standard k-ω model, transition SST model as well as Reynolds stress model were compared with three different types of experimental data, to study the effect of turbulence models on the transient fluid-solid coupled heat transfer. The results show that the exponentially increasing heat power is used partly for convection heat transfer while the other part remains in the solid, and the higher the increasing rate of heat power is, the lower the proportion of convective heat transfer is. Besides, the simulated equivalent surface heat fluxes are all lower than the experimental data, and the simulated values using ε type turbulence models are closer to the experimental data.