A Three-Dimensional Navier-Stokes Simulation of A Film-Cooled Turbine Stage

概要

論文の詳細を見る
Three-dimensional Navier-Stokes simulation is performed on the flow through a turbine stage with cooling air injection from multi-row holes on the surface of the stator vanes and the rotor blades. The computation is performed on a parallel computer with a very fine grid system, which has about thirty grid points inside each of cooling hole exits on the blade surface. The arrangements of the cooling holes, as well as the geometries of blades and passages, are given according to the real machine. The calculated result shows that the complicated three-dimensional flow structure in the stator and rotor passages, including secondary flow and flow separation on the end walls. It also shows how the injected coolant flows along the blade surfaces and how much the surface temperature is thereby lowered. A pair of kidney-shaped vortices is generated around cooling holes by the interaction between the coolant jet and the mainstream flow. The cooling effectiveness is estimated from the numerical result and compared with an empirical equation used for designing film-cooling arrangement. The influence of the coolant injection on the aerodynamic performance of turbine stage is also examined quantitatively.
社団法人日本ガスタービン学会の論文
2005-07-20