短突扩压器流场计算

NUMERICAL STUDY OF AN ANNULAR DUMP DIFFUSER FLOW

本文在三维贴体坐标系下对短环突扩扩压器进行流声计算．利用偏微分方程法和曲面论生成三维贴体网格，在按非交错网格系统求解各守恒方程时，采用抑制措施，避免压力振荡产生．考虑到扩压器是多通道区域，本文采用区域法进行数值分析，计算结果表明本计算方法合理可行．

In this paper a three dimensional calculation procedure for Simulating the turbulentannular dump diffuser Flows is presented, using a non-stagged grid system. The 3D body-fitted grid is generated by solving a system of elliptic partial differential equations. Thetransformation between cylindrical coordinates and non-orthogonal curvilinear coordinatesis performed by tensor. The governing equations are discretized by the control-volumeapproach. A specific scheme is used here to suppress the pressure oscillation. The k-εmodel is utilized to describe the turbulent now process. A subregional scheme is adopted tosuitabe for engineering applications. A SIMPLE algorithm is formulated on 3D curvilinearcoordinate. A three-dimensional calculation for the dump diffuser shows the potentical ofthis computation procedure.