Numerical Analysis of Three-Dimensional Compressible and Incompressible Viscous Flow in Turbomachines

• Main Authors: Cheng,Po-Jen, 鄭博仁
• Other Authors: Yang,Yi-Lung
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/64739987148033627872

碩士 === 中華大學 === 機械與航太工程研究所 === 89 === A Multi-block (H-Grid、O-Grid、Tip leakage-Grid) scheme has been developed for three-dimensional compressible & incompressible viscous fluid flow in turbomachinery. The O-Grid is used to solve the L.E. and T.E. distortion of the H-Grid. A special tip leakage-Grid is used to calculate the leakage flow field. The method is based on the Jameson‘s cell-centered finite volume scheme where a 4-stage Runge-Kutta integration is employed. Numerical analysis of compressible flow use density-based method, and numerical analysis of incompressible flow use pressure-based method. The programs are compared with the experimental data. The difference between numerical simulation and experimental data is within 5% for fluid flow exit angle. Compared with compressible flow and incompressible flow program. The difference is within 5% for Mach number of each cross section, and fluid flow exit angle & tangential velocity & axial velocity. The simulation of these two programs is very consistent. In this case, incompressible flow program operational time is shorter then compressible flow program by 60%, so analysis near incompressible flow using incompressible flow program is preferred.