MULTI-FIELD COUPLING ANALYSIS ON THE FILM-COOLING OF A TURBINE GUIDE VANE

摘要

Multi-field coupling method is used to assess the film-cooling properties of a turbine guide vane. The creep strain is used to evaluate the film-cooling validness, in order to take into account the effects of both temperature and thermal stress. Because of the high temperature gradients, thermal stress is much higher than the aerodynamic stress in a guide vane. It is found that large creep strain may be generated where the cooling holes locate, especially near the shower-head and upper endwall. For the shower-head film cooling, three types of holes (cylindrical, fan-shaped, double-jet) were studied. The results showed that fan-shaped and double-jet holes were suitable for the cooling of the shower-head of the guide vane. For the endwall, adding more cooling holes could reduce the area of high temperature and also reduce the creep strain.