Film Cooling With Swirling Coolant Flow on a Flat Plate and the Endwall of High-Loaded First Nozzle
Film Cooling With Swirling Coolant Flow on a Flat Plate and the Endwall of High-Loaded First Nozzle
复制标题
DOI：
10.1115/gt2014-25798
复制
发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
K. Takeishi;Y. Oda;Shinpei Kondo
中科院分区：
文献类型：
--
作者：
K. Takeishi;Y. Oda;Shinpei Kondo
本文介绍了一种通过平板和高负荷第一喷嘴端壁喷射旋转气膜冷却剂的圆形和扇形气膜冷却孔的气膜冷却效率的实验研究。实验采用平板风洞和二维叶片叶栅进行，该叶栅是根据NASA项目下研究的节能发动机（E3）的第一级叶片设计的。采用压敏漆（PSP）技术测量了E3型涡轮机第一喷管扩大端壁和平板风洞上的气膜冷却效率。实验结果表明，增大两股射流在孔内的夹角θ，可以提高圆孔气膜冷却效率，两股射流既用于冷却孔内壁，又在气膜冷却剂中产生旋流运动。相比之下，对于圆形气膜孔，存在θ = 20°的最佳喷流角，对于平板风洞试验，存在θ = 5-10°的最佳喷流角，对于扇形气膜孔的叶栅试验，存在θ = 15°的最佳喷流角。因此，即使在如此复杂的流场下，使用旋流冷却空气的新型薄膜冷却方法也能保持较高的薄膜冷却效率。Copyright © 2014 by ASME
This paper describes an experimental study on the film cooling effectiveness of circular and fan-shaped film cooling holes with a swirling film coolant injected through a flat plate and the endwall of a high-loaded first nozzle. The experiments were conducted using a flat plate wind tunnel and a two-dimensional vane cascade, which is designed based on the first-stage vane of an Energy Efficient Engine (E3) studied under a NASA project. The film cooling effectiveness on a flat plate wind tunnel and the endwall of the enlarged first nozzle of the E3 turbine was measured using pressure sensitive paint (PSP) techniques. The experimental results indicate that the film cooling effectiveness of a circular hole improved by increasing the angle θ of two impinging jets inside the cavity, which are used both for cooling the internal wall and generating a swirling motion in the film coolant. In contrast, it was found that there exist optimal jet angles of θ = 20° for a circular film cooling hole, θ = 5–10° for a flat plate wind tunnel test, and θ = 15° for the cascade test conducted using a fan-shaped film cooling hole. Thus the new film cooling method using swirling cooling air has been demonstrated to maintain high film cooling effectiveness even under such a complicated flow field.Copyright © 2014 by ASME