多级轴流压气机的径向掺混

MIXING FOR MULTI-STAGE AXIAL-FLOW COMPRESSORS

随着压气机向着更高的级负荷和更低的展弦比方向发展,径向掺混问题在气动分析和气动设计中越来越重要,当前对决定径向掺混的主要因素众说不一。本文用严格的理论,得到了用统一形式表示含二次流和湍流在内的各个径向掺混因素的多级轴流压气机通流基本方程组,并讨论了二维通流流场湍流掺混与实际流场三维剪切结构的关系。基本方程组的数值结果与试验结果以及其它掺混理论结果比较表呀,该方程组能够满意地模拟多级轴流压气机中的径向掺混特性。

A set of equations has been derived for through-flow fields in multi-stage axial-flow compressors, and all the spanwise mixing effects in a unified form are presented, including both turbulence and secondary flows. The relations have been discussed between three-dimensional shear structures of the compressors flow fields and the turbulent mixing effects in the two-dimensional throughflow fields. It has been found that the turbulent mixing in the two-dimensional throughflow fields is determined by the three-dimensional shear structures, rather than the two-dimensional shear structures alone. From the comparison of the computational results of the equations and experimental results as well as the results of Gallimore's mixing calculations, it has been shown that the characteristics of spanwise mixing can be modeled better by applying these equations.