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改进瞬态实验方法,使实验件的初始温度在上下表面间形成线性分布,降低了对实验设备和操作的要求.以此方法研究涡轮转子端壁的流动和换热情况,实验结果表明,端壁表面的换热强度受来流雷诺数和端壁二次流结构的共同影响.来流雷诺数增加,端壁整体换热增强;二次流的影响,导致端壁表面存在若干局部传热强化的区域,包括前缘马蹄涡形成的区域、马蹄涡分支覆盖的区域、靠近吸力面一侧通道涡生成的区域、以及角涡产生的位置.实验测得的结果符合对端壁二次流结构的现有认识.
The experimental results show that the initial temperature of the test piece is linearly distributed between the upper and lower surfaces and the requirements of the experimental equipment and operation are reduced.This method is used to study the flow and heat transfer conditions of the turbine rotor end wall.The experimental results show that the end The heat transfer intensity of the wall surface is affected by both the Reynolds number of the flow and the secondary flow structure of the end wall. The Reynolds number of the flow increases and the overall heat exchange of the end wall increases. The secondary flow causes several local heat transfer The regions strengthened include the region formed by the leading horseshoe vortex, the region covered by the branch of the horseshoe vortex, the region formed by the passage vortex near the suction side, and the position produced by the angular vortexes. The experimental results agree well with those of the secondary wall Existing understanding of structure.