Experimental Study on Sensitivity of Different Film Hole Discharge Coefficients under External Crossflow Conditions
In this paper,a high-speed plane wind tunnel test platform was built,and the discharge coef-ficient characteristics of cylindrical holes,fan-shaped holes,laidback fan-shaped holes and convergent slot holes were tested in the range of external crossflow Mach number 0-0.65 and gas film hole pressure ratio 0-2.Based on the test data,the flow coefficient prediction model of different gas film holes was es-tablished and the flow coefficient prediction model of convergent slot holes was improved.The results show that when there is no external crossflow,the discharge coefficients are fan-shaped holes,laidback fan-shaped holes,cylindrical holes and convergent slot holes in order from large to small.When there is external crossflow,it has a significant influence on the discharge coefficient of the gas film holes,and the external crossflow reduces the discharge coefficient of the gas film holes,and the smaller the gas film hole pressure ratio,the greater the influence on the Mach number of the external crossflow.
film coolingexternal crossflowhole patternpressure ratiodischarge coefficient
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