跨声速风洞扩散段数值模拟

Numerical Simulation of the Diffuserfor the Transonic Wind Tunnel

运用时间相关的全隐ＡＦ方法，计算二维及轴对称亚声速高速扩散段内流场。流动控制方程使用全Ｎ－Ｓ方程。湍流模型选择了Ｂａｌｄｗｉｎ－Ｌｏｍａｘ代数湍流模型，和两层κ－ε二方程模型。经过同国外实验结果的比较，证明本文计算结果合理。在此基础上，计算了中国气动力研究与发展中心２．４ｍ×２．４ｍ引射式跨声速风洞第二扩散段在不考虑喷流干扰及常规运行状态下的流场。

In this paper,the time dependent fully implicit Approximate Factorization (AF) algorithm was used to solve the flow fields of the subsonic high speed diffuser over the two dimensional and axial symmetry cases.The governing equations are the full Navier Stokes euqations.There are two models of turbulence to be used for the computation,one is the Baldwin Lomax algebraic model,and the other is the two layer κ ε turbulent model.Comparing the numeric results of this paper with the experiments and computation data of the chosen model,it is indicated that the numerical results are effictive and the calculated flow fields show similar phenomenon with the physical mechanism.Since the confidence of the program was proved,the second diffuser flow fields of the CARDC 2.4m×2.4m injection driven transonic wind tunnel was calculated under the normal and high pressure conditions without the disturbance of injector.