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采用基于剪切应力输运(SST)k-ω两方程湍流模型的分离涡(DES)方法和雷诺时均Navier-Stokes(RANS)方法对超燃气动斜坡结合燃气发生器增进掺混方案进行数值仿真研究。通过对比DES仿真结果、RANS仿真结果与试验结果,发现DES仿真结果对流场内涡结构的捕捉和分辨能力强于RANS方法获得的结果。选取燃气发生器喷流形成的壁面涡流特征角为比较标准,DES仿真结果显示该角度为48°,RANS仿真结果为37°,而试验测得该角度为47°。可见DES仿真结果与试验结果更为接近,说明对于气动斜坡结合燃气发生器的超燃掺混方案,DES方法仿真结果是合理的。
Using the separation vortex (DES) method and the Reynolds average Navier-Stokes (RANS) method based on the turbulence model of shear stress transport (SST) k-ω turbulent flow model, simulation Research. By comparing the DES simulation results with the RANS simulation results and the experimental results, it is found that the DES simulation results are better than those obtained by the RANS method in capturing and resolving vortices in the flow field. The characteristic angle of wall eddy current formed by the jet of gas generator is selected as the comparative standard. The DES simulation results show that the angle is 48 °, and the RANS simulation result is 37 °, while the angle measured by the experiment is 47 °. It can be seen that the DES simulation results are closer to the experimental ones, which shows that the DES simulation results are reasonable for the combination of the gas-ram and the gas generator.