Tip-Shaping for HP Turbine Blade Aerothermal Performance Management
Tip-Shaping for HP Turbine Blade Aerothermal Performance Management
复制标题
DOI：
10.1115/1.4007896
复制
发表时间：
2013-09
影响因子：
1.7
通讯作者：
Qiang Zhang;Li He
中科院分区：
文献类型：
--
作者：
Qiang Zhang;Li He
对于典型的高压 (HP) 涡轮叶片来说，大部分的过叶尖泄漏流通常是跨音速的。已经观察到，高速流动尖端区域中的尖端传热明显低于低速区域中的尖端传热。因此，本研究研究了通过尖端成形来控制叶片传热以局部加速流动至跨音速状态的可行性。结果表明，局部流动加速可以显着降低热负荷。这种过度尖端成形提供了作为控制叶片尖端表面上的热负荷分布（以及由此产生的热应力）的有效手段的巨大潜力。 CFD 分析详细证明了该概念和流动物理的可行性，无论是否存在移动套管的影响。还介绍了从高速线性级联设施获得的实验结果。本文提出的新颖的尖端成形概念可以提供促进尖端间隙内阻塞的潜力，作为控制尖端泄漏质量流量的新方法。 © VC 2013，ASME。
A large portion of the over-tip leakage flow is often transonic for a typical high pressure (HP) turbine blade. It has been observed that the tip heat transfer is noticeably lower in a high speed flow tip region than in a low speed region. The present study therefore investigates the feasibility of controlling blade heat transfer by tip shaping to locally accelerate the flow to a transonic regime. The results show that a significant heat load reduction can be achieved by the local flow acceleration. Such over-tip-shaping provides a great potential as an effective means to control heat load distribution (and hence thermal stress) over the blade tip surface. The feasibility of the concept and flow physics have been demonstrated in detail by CFD analyses, with and without the effect of moving casing. The experimental results obtained from a high speed linear cascade facility have also been presented. The novel tip-shaping concept proposed in this paper could provide a potential for promoting choking inside the tip gap as a new way to control the over-tip leakage mass flow. © VC 2013 by ASME.