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首页> 外文会议>41st AIAA fluid dynamics conference and exhibit 2011 >An Experimental Investigation on the Trailing Edge Cooling of Turbine Blades by using PIV and PSP Techniques
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An Experimental Investigation on the Trailing Edge Cooling of Turbine Blades by using PIV and PSP Techniques

机译：PIV和PSP技术对涡轮叶片后缘冷却的实验研究

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摘要

An experimental investigation was conducted to study the flow characteristics of the wall jets exiting from the trailing edge cooling slots at the pressure side breakout of turbine blades and the resultant film cooling effectiveness over the protected wall. In the present study, while air flow was supplied to simulate the hot main stream, the cooling jet streams were fed by using pure nitrogen. The mixing of the hot ambient gas into the cooling flows in gas turbines is replaced by the mixing of ambient air flow into the nitrogen jet streams over the protected wall. A high-resolution Particle Image Velocimetry (PIV) system was used to achieve detailed flow field measurements to quantify the evolutions of the unsteady vortex and turbulent flow structures in the cooling jet streams to examine the dynamic mixing process between the cooling jet streams and the main stream flows on the protested wall. Based on the theory of mass transfer analogy, the adiabatic film cooling effectiveness on the protected wall is expressed in the term of the oxygen concentration distribution over the protected wall, which is measured by using the pressure sensitive paint (PSP) technique. The detailed flow field measurements were correlated with the adiabatic cooling effectiveness maps to elucidate underlying physics in order to improve our understanding for a longer lifetime and better performance of turbine blades used for future advanced power.
机译：进行了实验研究，以研究在涡轮叶片压力侧断裂时从后缘冷却槽流出的壁流的流动特性，以及在保护壁上产生的薄膜冷却效果。在本研究中，在提供空气流以模拟热主流的同时，使用纯氮气供入冷却的喷射流。将热的环境气体混合到燃气轮机中的冷却流中，由周围的空气混合到受保护壁上的氮气流中来代替。高分辨率粒子图像测速（PIV）系统用于实现详细的流场测量，以量化冷却射流中不稳定涡流和湍流结构的演变，以检查冷却射流与主射流之间的动态混合过程。溪流在抗议墙上。基于传质类比理论，受保护壁上的绝热膜冷却效率用受保护壁上的氧气浓度分布来表示，该浓度是通过使用压敏涂料（PSP）技术测量的。详细的流场测量值与绝热冷却效果图相关联，以阐明基本物理原理，从而增进我们对更长寿以及更高功率的涡轮叶片的理解，该叶片用于未来的先进动力。

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