Effect of double rows of film holes interaction on film cooling efficiency
The cooling efficiency of flat film was measured using a high-precision infrared thermal imager,and the film cooling efficiency between double-cross-row holes and single row holes is compared.The interaction between film holes and the influence of blowing ratio(M=0.65,1.0,1.5)and density ratio(DR=1.0,1.5)on the cooling efficiency was analyzed.Moreover,the flow field with film cooling was compared using numerical calculation methods.The results show that,with the increase of the blowing ratio,the cooling efficiency of the single row holes decreases while that of the double-cross-row holes improved greatly,but the film coverage effect at the spanwise direction deteriorates.Increasing the density ratio will improve the cooling performance.However,the influence of double rows of film holes and blow ratio is much higher on the cooling effectiveness,compared with the density ratio.For the double rows of film holes cooling,the cooling jet forms a reverse kidney-shaped vortex downstream of the holes,which will prevent the jet blowing away from the cooling wall.
turbine bladefilm coolingcooling efficiencydouble rows of film holesflow and heat transfer
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