Numerical decoupling of overall cooling effectiveness based on double-wall cooling structure
Numerical decoupling method was used to quantitatively analyze the relationship between the overall cooling effectiveness of impingement-effusion model and the internal cooling,bore cooling and coolant coverage.The blowing ratios were 0.25,0.5,1 and 1.5.It was found that the blowing ratio had a significant effect on the comprehensive cooling effect of the impact divergence model.When the blowing ratio increased from 0.25 to 1.5,the overall cooling effectiveness increased by 57.9％.The stagnation region of impingement jet was mainly dominated by internal cooling.The region where the bore cooling had the greatest influence on the overall cooling effectiveness was located upstream of the film hole outlet,and the influence of bore cooling along the streamwise direction was gradually reduced.The influence of coolant coverage on the overall cooling effectiveness gradually accumulated along the streamwise direction,and the influence near the third film hole outlet was the largest.The influence in the downstream of film hole was greater than that in the region away from the film hole.When the blowing ratio increased to 1,the effect of bore cooling on the overall cooling effectiveness exceeded that of coolant coverage.
overall cooling effectivenessfilm coolinginternal coolingdecoupling methodblowing ratioflat-plate model
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