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肋粗糙表面在透平叶片冷却中已有实际应用。为更有效地提高冷却效果,在叶片内腔壁面设置肋-槽型复合粗糙元是一种有力措施(见图1)。由于在肋间加了槽,从而加强了粗糙元对流体的连续性扰动,同时换热面积也有所增加。文献[1]以水和二甲苯为介质在肋-槽型复合粗糙环形通道中进行的换热和阻力试验表明:复合粗糙面的换热强度高于肋粗糙表面,而流动阻力增加较小。
The ribbed rough surface has practical applications in turbine blade cooling. In order to improve the cooling effect more effectively, it is a powerful measure to dispose the rib-groove composite roughness on the wall of the vane cavity (see Fig. 1). Due to the addition of grooves in the intercostal space, the continuous disturbance of the coarse elements to the fluid is strengthened and the heat transfer area also increases. The heat transfer and resistance tests of [1] using water and xylene as medium in the rib-groove composite rough annular channel show that the heat transfer intensities of the composite rough surface are higher than those of the rough surface of the rib, and the increase of the flow resistance is small.