Session: 12-01 Turbine Film Cooling

Paper Number: 82178

82178 - Experimental Investigation of Effusion Film Cooling on a Cylindrical Leading Edge Model 

Effusion film cooling is effective for cooling high temperature turbine blades because it consumes less amount of coolant and produces more uniform temperature distribution. This study focuses on the effect of effusion cooling on a cylindrical model representing the leading edge of a gas turbine blade. The experiment was conducted in a low speed wind tunnel operating at a Reynolds number of 100,000. The pressure sensitive paint (PSP) was used to acquire the adiabatic film cooling effectiveness. Additive manufacturing was used to fabricate the porous structure on the test cylinder for effusion cooling. In the current study, the cooling injection employed simple and compound angles. Effects of streamwise and spanwise hole spacings, turbulence intensities (1%, 8.7%), and blowing ratios (0.075, 0.15, 0.3, and 0.6) were studied. Compared to the traditional film cooing, effusion cooling achieved higher cooling effectiveness and produced better coolant coverage. Increasing the streamwise spacing noticeably reduced the cooling effectiveness for the simple angle case as a result of the film lift-off, and the compound angle cases achieved higher effectiveness. The simple angle holes were more sensitive to the change in the mainstream turbulence intensity and an increase in the turbulence intensity promoted the mixing of the coolant with the mainstream. In addition, the effusion cooling was more resistant to the coolant lift-off at high blowing ratios.

Presenting Author: Yao-Hsien Liu National Yang Ming Chiao Tung University

Presenting Author Biography: Dr. Yao-Hsien Liu is a professor in the department of mechanical engineering at National Yang Ming Chiao Tung University.

Authors:

I-Cheng Huang National Yang Ming Chiao Tung University
Kuan-Hsueh Lin National Yang Ming Chiao Tung University
Chih-Yung Huang National Tsing Hua University
Yao-Hsien Liu National Yang Ming Chiao Tung University