Study on Cooling and Loss Characteristics of Air Film in Front of Back Throat of Air Cooled Turbine Guide Blade
Aiming at the first stage guide vane profile of E3 high-pressure turbines,the cooling structure modeling was carried out,and the influence of the inclination angle of the air film hole on the air film cooling efficiency and aerodynamic loss was studied by using software ANSYS simulation analysis method.The air film cooling efficiency at the lift off point and recontact point after the cool air was discharged from the hole row with large curvature was quantitatively analyzed.To ensure the guide vane can work safely and reliably provide technical support.The pressure ratio of cold air inlet to main gas is 1.45 and inclination angles of 20°,25°,30°,35°,40°and 45°under different curvations are studied.The results show that the film cooling efficiency decreases and the pressure loss coefficient and energy loss coefficient increase with the increase of film hole inclination angle,for 0.125 holes,the change of inclination angle has little influence on the position of lift-off point,and the change of inclination angle has little influence on the film cooling efficiency and aerodynamic loss,the inclination angle is more obvious to the reattachment point.
air-cooled turbineguide vanegas film coolingaerodynamic loss
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