MSEMD排气系统扩压长支管定常流动研究

INVESTIGATION ON STEADY TURBULENT FLOW IN AXISYMMETRIC DIFFUSER OF MSEMD SYSTEM

本文用数值方法研究了MSEMD系统（单总管扩压长支管系统）轴对称扩压长支管的定常流动特性。在贴体坐标系中用与时间相关的二维流动计算方法对湍流流动的控制方程进行了数值求解，用二阶MacCormack差分方法处理内部节点，用二阶参考平面上的特征线法处理进、出口边界条件，并把计算结果与实测结果进行了比较，它们之间吻合得相当好。

The calculation of axisymmetric diffuser steady turbulent flow in MSEMD system is presented. In body-fitted coordinate system, the governing equations are numerically computed with timeixdependent method. The internal grids are dealt with the second-order MacCormack method and inlet and outlet conditions are calculated by the second-order reference plane characteristic method. The comparisons between the numerical and experimental results indicate that they fit well.