关键词: 旋转换热；侧向冲击；楔形通道；实验研究；涡轮叶片

Abstract: In order to investigate the effects of lateral impingement on heat transfer in a turbine blade inner cooling structure， experimental tests were conducted in a lateral impingement wedge-shaped channel simplified from blade trailing edge. The test conditions were arranged at the Re of 5×103 to 1×104， and Ro of 0 to 0.54. The heated cooper plate technique is applied to obtain the span-wise and stream-wise heat transfer distributions. According to the experimental results， the lateral coolant impingement causes higher heat transfer at inner and mid regions than outer region. And the rotation enhances this span-wise heat transfer difference. As the Ro increases， the regional heat transfer of the channel middle part decreases first， and till to a critical rotation number which is corresponding for the lowest local heat transfer， and then increases again. The critical rotation number was found to decrease with increasing radial stream-wise locations. Compared to static channel， the averaged heat transfer level of rotational channel decrease till to 15% when Ro reaches 0.15， while increase up to 20% within the test range (Ro≈0.55).

Key words: Rotational heat transfer；Lateral impingement；Wedge-shaped channel；Experimental investigation；Turbine blade