高レイノルズ数条件下における高圧タービン翼まわりの非定常流れ解析 : 後縁近傍の非定常流れとベース圧

概要

論文の詳細を見る
This paper presents the attempts to predict the base pressure of the unsteady flowfield in a high-pressure turbine vane using the numerical simulation. In the present work, a two-equation turbulence model based unsteady Reynolds-averaged Navier-Stokes (URANS) simulation and detached-eddy simulation (DES) are carried out. The flowfield contains the unsteadiness caused by the vortex shedding which affects the base pressure behavior. For this reason, the time-accurate unsteady simulations are used with a second-order accurate implicit time marching method. The base pressure decrease is well known as a phenomenon which should be avoided as much as possible to reduce the blade profile loss. The fine grid DES result provides the quantitatively agreement with the experimental data and shows the LES-like vortex structure in the wake. Meanwhile, the same grid URANS result provides the two-dimensional spanwise vortex structures and the base pressure decrease stronger than the DES result.
2010-01-20