Experimental Heat Transfer and Bulk Air Temperature Measurements for a Multipass Internal Cooling Model with Ribs and Bleed.
Experimental Heat Transfer and Bulk Air Temperature Measurements for a Multipass Internal Cooling Model with Ribs and Bleed.
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DOI：
10.1115/2000-gt-0233
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发表时间：
2000-05
期刊：
影响因子：
--
通讯作者：
D. Thurman;Philip E. Poinsatte
中科院分区：
文献类型：
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作者：
D. Thurman;Philip E. Poinsatte
采用简单的3腿蛇形试验段进行了传热和空气温度的实验研究，该试验段模拟了涡轮叶片带有脱扣带和放气孔的内部冷却通道。目的是研究肋和各种排气条件对内部冷却的相互作用，并更好地了解内部通道中的整体空气温度。利用热致变色液晶的瞬态技术获得了稳态传热测量结果。起下钻带连接在测试段的一面壁上，位于排气孔之间或附近。对用于气膜冷却的排气孔进行了测量，以模拟外部压力对涡轮叶片的影响。研究发现，靠近排气孔的肋板比孔间的肋板传热增强更大，并且这两种配置都受上游排气孔率的影响较小。空气温度测量是沿着模型的一条腿在不显眼的位置进行的。平均空气温度沿模型的一条腿保持相当恒定。ASME版权所有©2000
An experimental study was made to obtain heat transfer and air temperature data for a simple 3-leg serpentine test section that simulates a turbine blade internal cooling passage with trip strips and bleed holes. The objectives were to investigate the interaction of ribs and various bleed conditions on internal cooling and to gain a better understanding of bulk air temperature in an internal passage. Steady state heat transfer measurements were obtained using a transient technique with thermochromic liquid crystals. Trip strips were attached to one wall of the test section and were located either between or near the bleed holes. The bleed holes, used for film cooling, were metered to simulate the effect of external pressure on the turbine blade. Heat transfer enhancement was found to be greater for ribs near bleed holes compared to ribs between holes, and both configurations were affected slightly by bleed rates upstream. Air temperature measurements were taken at discreet locations along one leg of the model. Average bulk air temperatures were found to remain fairly constant along one leg of the model.Copyright © 2000 by ASME