Influence and Optimization of Elliptic Trailing Edge on Aerodynamic Performance of Transonic Cascades
To investigate the impact of elliptic trailing edge on transonic cascade losses,the cascades with different elliptic trailing edge were simulated by CFD.The results showed that in the range of outlet Mach number 0.9～1.4,the elliptic eccentricity increased could reduce the blade profile loss of transonic cascades,the blade profile losses is minimum when the elliptic eccentricity close to 1.0.The secondary flow losses and tip leakage losses of transonic cascades decreased first and then increased with the increase of elliptic eccentricity,but the optimal elliptic eccentricity of the secondary flow losses and tip leakage losses were different which show the inversely proportional to outlet Mach number.By optimizing radial distribution of the elliptic eccentricity for a twisted dynamic blade,the total loss of the optimized cascade was reduced by 4.3％compared to the circular trailing edge.Specifically,the blade profile loss decreased by 9.6％,the secondary flow loss increased by 3％,and the tip leakage loss decreased by 1.6％.
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