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research-article

Interaction of Flow and Film-Cooling Effectiveness between Double-Jet Film-Cooling Holes with Various Spanwise Distances

[+] Author and Article Information
Jiaxu Yao

State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an Shaanxi, 710049, China
yaojiaxu@hotmail.com

Jin Xu

State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an Shaanxi, 710049, China
xujinxjtu@126.com

Ke Zhang

State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an Shaanxi, 710049, China
kezhang@mail.xjtu.edu.cn

Jiang Lei

State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an Shaanxi, 710049, China
leijiang@mail.xjtu.edu.cn

Lesley Wright

Department of Mechanical Engineering, Baylor University, Waco, TX 76798-7356
lesley_wright@tamu.edu

1Corresponding author.

ASME doi:10.1115/1.4041809 History: Received May 31, 2018; Revised October 18, 2018

Abstract

The interaction of flow and film-cooling effectiveness between jets of double-jet film-cooling (DJFC) holes on a flat plate is studied experimentally. The time-averaged flow field in several axial positions is obtained through a seven-hole probe. The downstream film-cooling effectiveness on the flat plate is measured by Pressure sensitive paint (PSP). The inclination angle (?) of all the holes is 35°, and the compound angle (ß) is ±45°. Effects of the spanwise distance between the two interacting jets of DJFC holes are studied while the streamwise distance (s) is kept as 3d. Results show that the interaction between the two jets of DJFC holes has different effects at different spanwise distances. For a small spanwise distance (p/d=0), the interaction between the jets presents a pressing effect. The downstream jet is pressed down and kept attached to the surface by the upstream one. The effectiveness is not sensitive to blowing ratios. For mid spanwise distances (p/d=0.5 and 1.0), the anti-kidney vortex pair dominates the interaction, and pushes both of the jets down, thus leading to better coolant coverage and higher effectiveness. As the spanwise distance becomes larger (p/d=1.5), the pressing effect almost disappears, and the anti-kidney vortex pair effect is weaker. The jets separate from each other and the coolant coverage decreases. At a higher blowing ratio, the interaction between the jets of DJFC holes happens later.

Copyright (c) 2018 by ASME
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