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research-article

Effect of Density Ratio on Film-Cooling Effectiveness Distribution and Its Uniformity for Several Hole Geometries on A Flat Plate

[+] 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:10.1115/1.4041810 History: Received May 31, 2018; Revised October 18, 2018

Abstract

The film cooling effectiveness distribution and its uniformity downstream of a row of film cooling holes on a flat plate are investigated by Pressure sensitive paint (PSP) under different density ratios. Several hole geometries are studied, including streamwise cylindrical holes, compound-angled cylindrical holes, streamwise fan-shape holes, compound-angled fan-shape holes, and double-jet film-cooling (DJFC) holes. For a fair comparison, the pitch is kept as 4d for the cylindrical and the fan-shape holes, and 8d for the double-jet film-cooling holes. The uniformity of effectiveness distribution is described by a new parameter (Lateral-Uniformity, LU) defined in this paper. Effects of density ratios on the film-cooling effectiveness and its uniformity are focused. Differences among geometries and effects of blowing ratios are also considered. Results show that at higher density ratios, the lateral spread of the discrete-hole geometries is enhanced, while the DJFC holes is more advantageous in film-cooling effectiveness. Mostly, a higher lateral-uniformity is obtained at DR=2.5 due to better coolant coverage and enhanced lateral spread, but effects of the density ratio on the lateral-uniformity are not monotonic in some cases. Utilizing the compound angle configuration leads to an increased lateral-uniformity due to a stronger spanwise motion of the jet. Generally, with a higher blowing ratio, the lateral-uniformity of the discrete-hole geometries decreases due to narrower traces, while it of the DJFC holes increases due to a stronger spanwise movement.

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