关键词: 涡轮叶片;薄膜冷却;气体冷却;喷流试验;湍流模型;数值分析

Abstract: An experimental study on velocity and turbulence fields downstream of a single film hole jet has been completed by using X probe of hot wire(DISA55M).A fan shaped hole with flared angle of 15° was adopted in the experiment.Under the influence of jet,the turbulence level is obviously increased and strong anisotropic turbulence exists in the downstream of the hole.In the regions unaffected by the jet,the turbulence can be still regarded as isotropic.The general eddy viscosity relationships are adaptable yet for simulating the shear stresses in film cooling flow fields.However,the eddy viscosity variation itself is rather complex in these regions that it requires significant modification in different directions.Compared with experimental data,the calculated results of the standard k ε turbulence model could be successful in internal flow of the hole and downstream of jet with the small streamwise inclined angle.In the case of large streamwise angle,the velocity and film cooling effectiveness were underpredicted with this kind of turbulence model.It might be necessary to introduce a nonisotropic turbulence model in the simulation of film cooling flow fields

Key words: Turbine blade;Film cooling;Gas cooling;Jet test;Turbulence model;Numerical analysis