NUMERICAL STUDY OF TOPOLOGICAL STRUCTURE OF 3-D TRANSONIC VISCOUS FLOW FIELD (TVFF) INSIDE TURBINE CASCADE

The major purpose of this paper is to numerically study the complex structure of vortex system occurring within transonic turbine cascade. The transonic viscous flow in turbine cascade is simulated by solving full 3D Reynolds average N S equations, and then detailed analyses of vortex system structure are presented. Under guidance of topology, the wall limiting streamlines are employed to reveal the flow structure near the wall, and an analysis of space streamlines and cross section streamlines is given for the investigation of flow structure in the flow field. Through the analysis, the formation and evolution of the vortex system and the whole process of separation occurring within this turbine cascade are revealed

涡轮高压导叶流场结构及损失分析

采用具有TVD性质的三阶精度Godunov格式 ,数值模拟了某型涡轮高压导叶流场 ,并对流场损失及涡系结构进行分析 ,结果表明由于强烈的径向窜流 ,使低能流体大量地迁移到下端壁 ,使得下端部的损失显著增大 ,从而引起了总损失的增加。因此在高压导叶设计中 ,当采用低展弦比叶片时 ,应注意削弱叶片出口附近流场的严重径向窜流。

振动边界耦合作用下基于微分求积法的三维不可压缩粘性流体的数值模拟

本文采用微分求积(DQ)法基于非交错网格建立在考虑流体 结构相互作用下求解三维不可压缩流体 Navier Stokes方程的数值方法。弹性振动边界为矩形薄板,诱发板振动的因素为作用在板上的脉动压力场,边界板的振动与流动形成耦合作用。数值结果给出了一箱形流道内雷诺数分别为 100,1000 和 10000 时的流场。大量分析表明,用本文方法模拟考虑流体 结构相互作用下的流动问题是可行的。