Effect of Geometric Factors of Micro-ribs on Impingement Cooling Performance of Turbine Blades
In order to investigate the strengthening effect of W-shaped ribs on impingement cooling,this paper studied the effect of rib width,height and angle on the heat transfer target surface when the im-pingement Reynolds number Re is in the range of 4 000-10 000 based on the smooth target surface by u-sing the numerical simulation method.The studied rib width W is 0.05d,0.1d,0.2d,0.4d,height H is 0.1d,0.3d,0.4d,0.8d and angle α is 90°,120°,150°,180°.The results show that with the in-crease of rib height,the total heat transfer and the resistance increase as a whole,and the comprehensive thermal performance is the best at H=0.3d.The amount of heat transfer first increases and then decrea-ses with increasing rib width,reaching a maximum at W=0.1d.As the angle increases,the resistance first increases and then decreases,and the comprehensive thermal performance gradually decreases,with the best comprehensive thermal performance at α=90° and the maximum total heat transfer at α=120°.As a whole,the comprehensive thermal performance of the W-shaped rib is the best at W=0.1d,H=0.3d and α=90°.And the heat transfer capacity can be improved by 28.5％-33.5％compared with that of the smooth target surface.
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