Numerical investigation and optimized design of the performance of curved diffuser cascades with different turning angles

Through a numerical simulation investigated is the impact on the cascade performance of the curved height and curved angle in a curved diffuser cascade having different turning angles. Through the use of an experimental design and genetic algorithms an optimized design and a selection of possible options were carried out, resulting in the identification of an optimum matching range of curved height and curved angle under different turning angles. It has been found that the law governing the optimal matching of curved height and curved angle under three different turning angles can be different. With the increase in the turning angle of a diffuser cascade the matching of a relative small curved height and curved angle will be more effective in achieving the reduction of aerodynamic losses.