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为了获得某型发动机支板内通道冲击射流的换热特性,采用热色液晶全表面瞬态测温技术对楔形通道内表面进行换热实验。研究了射流雷诺数、射流角度和出口缝的位置对努塞尔数的分布和大小的影响。射流雷诺数的变化范围是6.3×103~15.9×103,射流角度的变化为0~30°。研究表明:射流雷诺数的增加,射流角度的增大均会使得平均换热效果增强。在射流角度0~15°内,出口缝离射流入口越近,壁面换热越强。射流斜吹情况下,被冲击面的努塞尔数要高于未被冲击面。其中,射流角度30°时换热的不对称性最显著。在射流角度为15°时,支板前缘的换热效果最强。
In order to obtain the heat transfer characteristics of impinging jets in a certain type of engine support, the heat transfer experiment on the inner surface of the wedge channel was carried out by the thermochromic liquid crystal full surface transient temperature measurement technique. The effects of jet Reynolds number, jet angle and exit slit position on the distribution and size of Nusselt number were studied. The range of Reynolds number of jet is 6.3 × 103 ~ 15.9 × 103, and the change of jet angle is 0 ~ 30 °. The results show that the increase of jet Reynolds number and the increase of jet angle all make the average heat transfer enhancement. In the jet angle of 0 ~ 15 °, the exit slit near the jet inlet, the wall heat transfer stronger. Jet oblique blowing case, the impact of the Nusselt number is higher than the surface was not hit. Among them, when the jet angle of 30 ° heat exchange asymmetry most significant. In the jet angle of 15 °, the front edge of the strongest heat exchanger.