Session: 12-07 Optimization of Film Cooling Geometries

Paper Number: 82358

82358 - Shape Optimization of the Laidback Fan-Shaped Film Cooling Hole on Pressure Surface of Turbine Guide Vane 

The present study employs computational fluid dynamics (CFD) to explore the effect of the shape parameters of fan-shaped holes on film cooling effectiveness, and the optimum values and change rules of each shape parameter to maximize the averaged film cooling effectiveness are presented.

Among the shape parameters of a laidback fan-shaped film hole, the injection angle and the hole length are fixed as 25 degrees and 2.5 millimeters, respectively, the three shape parameters, the forward expansion angle, the lateral expansion angle, and the shaped-length ratio, are selected as variables by the Box-Behnken Design (BBD) method. And RSM (Response Surface Methodology) is used to obtain the optimal values of each parameter. Results show that the film cooling effectiveness of the optimal hole is higher than that of the reference cylindrical hole by 224%. The factors influence analysis shows that film cooling effectiveness increases as the forward and lateral expansion angles increase, and increases and then decreases with the shaped-length ratio. However, when the shaped-length ratio is greater than 0.4, the film cooling effectiveness decreases with the increase of the lateral expansion angle. In general, holes with a higher orifice area show higher film cooling effectiveness. The change rules are not monotonous, therefore, all shape parameters should be considered simultaneously to achieve shape optimization of the laidback fan-shaped film cooling hole on pressure surface of turbine guide vane.

Presenting Author: Jiang yan Beihang University

Presenting Author Biography: I am studying for a master's degree in Beihang University.

Authors:

Jiang yan University
Li haiwang Beihang University
Tao zhi Beihang University
Zhou zhiyu Beihang University