Topology Optimization Design and Experimental Study of Bleed Air Cavity in a Coanda Jet Cascade
In order to reduce the deviation between the jet direction outflowing from the inside of Coanda jet cascade and cascade mainstream direction,and further improve the inhibition effect of Coanda jet on flow separation,the structure of the original Coanda jet cascade bleed air cavity was optimized in this pa-per,based on the fluid topology optimization technology and the guide rib layout method.A numerical calculation and a high speed wind tunnel test were used to evaluate the enhancement effect of the bleed air cavity structure optimization on the aerodynamic performance of Coanda jet cascade.Results show that the optimized ribbed bleed air cavity structure can reduce the angle of deviation between the Coanda jet and the mainstream mixture,and the flow separation area of the trailing edge of the suction surface of the blade is reduced further;with an inflow Ma of 0.5,an angle of attack of 0° and a jet mass flow ratio of 1.25%,compared to the original bleed air cavity structure,the total pressure loss coefficient of the Coanda jet cascade with a ribbed bleed air cavity is decreased by 7.15%;the use of a ribbed bleed air cavity structure can make the total blade pressure loss of cascade under different operating conditions low-er than that of original cavity structure,and the minimum total pressure loss coefficient is obtained at the optimal jet mass flow ratio.
Coanda jethighly loaded compressorflow separationtopology optimizationcascade test
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