轴流压气机考虑展向掺混的数值计算

Numerical Calculation of Axial Compressor Considering Spanwise Mixing

为了更加准确地反映压气机内部流场的展向分布特性并提高计算精度,基于流线曲率法发展了1种考虑压气机内部展向掺混作用的计算方法。应用Gallimore-Cumpst y(G-C)掺混模型模拟紊流扩散的作用,在2维Cart er公式基础上引入改善的Rober t s修正模型对落后角进行预估,通过落后角反映二次流的作用,并对3级轴流压气机3S1进行了计算分析和比较。结果表明:不考虑掺混因素时所得计算数据的展向分布情况与实际流场相差较大;只有同时考虑紊流掺混和二次流2种因素,才能得到最优结果。该方法能够较好地模拟轴流压气机的展向掺混作用,得到更加贴近实际的气动参数分布,可为压气机设计和优化提供参考。

In order to reflect the spanwise distribution characteristics of inner flow field of compressor more accurately and to improve calculation accuracy,a calculation method considering spanwise mixing in the axial compressor was developed,based on streamline curvature method.The turbulent diffusion was simulated by applying Gallimore-Cumpsty（G-C）mixing model.The deviation angle,which was used to reflect the effect of secondary flow,was predicted by the modified Roberts model based on the Carter＇s 2 D formula.and the computational analysis and comparison of a three-stage axial compressor 3 S1 were performed.The results show that the spanwise distribution of the calculation taking no account of mixing is much different from the actual flow field,and the optimal results can be achieved only if turbulent diffusion and secondary flow are considered simultaneously.The method can simulate the spanwise mixing performance of axial compressors better and obtain reliable aerodynamic parameter distribution,which is helpful to the design and optimization of compressor.