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Appl. Sci. 2017, 7(6), 633; doi:10.3390/app7060633

Experimental Investigation on the Effects of DBD Plasma on the Film Cooling Effectiveness of a 30-Degree Slot

1
School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10417, Korea
2
Center for Urban Energy Research, Korea Institute of Science and Technology, Seoul 02792, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Xianchang Li
Received: 22 March 2017 / Revised: 22 May 2017 / Accepted: 15 June 2017 / Published: 19 June 2017
(This article belongs to the Special Issue Advances in Thermal System Analysis and Optimization)
View Full-Text   |   Download PDF [6411 KB, uploaded 19 June 2017]   |  

Abstract

The effects of dielectric barrier discharge (DBD) plasma on the film cooling effectiveness of a 30-degree slot was experimentally investigated in a low-speed wind tunnel. The pressure sensitive paint (PSP) technique was used to measure the film cooling effectiveness, and two blowing ratios (0.5 and 1.0) were tested. A sinusoidal waveform with a 1-kHz frequency was supplied to the exposed electrode. Two input voltages (6 and 7 kV) and two exposed electrode locations were considered. The results showed that the film cooling effectiveness of the slot was higher for the blowing ratio of the 1.0 case than that for the blowing ratio of the 0.5 case regardless of plasma operation. The higher input voltage case (7 kV) showed higher film cooling effectiveness than the lower input voltage case (6 kV). The improvement in film cooling effectiveness facilitated by the DBD plasma was more significant when the coolant had less momentum. The maximum improvement of the area averaged film cooling effectiveness was 2.3% for the case with the exposed electrode located at the slot exit and a blowing ratio of 0.5. View Full-Text
Keywords: gas turbine; slot film cooling; film cooling effectiveness; pressure sensitive paint (PSP); dielectric barrier discharge (DBD) plasma gas turbine; slot film cooling; film cooling effectiveness; pressure sensitive paint (PSP); dielectric barrier discharge (DBD) plasma
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, Y.J.; Kim, G.M.; Shin, Y.; Kwak, J.S. Experimental Investigation on the Effects of DBD Plasma on the Film Cooling Effectiveness of a 30-Degree Slot. Appl. Sci. 2017, 7, 633.

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