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research-article

Film Cooling on the Geometrically Modified Trailing Edge Model of Gas Turbine Blade

[+] Author and Article Information
Zifeng Yang

3640 Colonel Glenn Hwy 209 RC Mechanical Engineering Dayton, OH 45435 zifeng.yang@wright.edu

Mark Johnson

3640 Colonel Glenn Hwy 209 RC Mech Engineering Dayton, OH 45435 mark.johnson@wright.edu

Natalia Posada

1950 Fifth St AFRL/RQTT Bldg 18 WPAFB, OH 45433 natalia.posada.1@us.af.mil

Shichuan Ou

1950 Fifth St AFRL/RQTT Bldg 18 WPAFB, OH 45433 shichuan.ou@gmail.com

Rolf Sondergaard

1950 Fifth Street Building 18 Wright Patterson AFB, OH 45433 rolf.sondergaard@us.af.mil

1Corresponding author.

Manuscript received August 8, 2018; final manuscript received May 31, 2019; published online xx xx, xxxx. Assoc. Editor: Dr. David G. Bogard.

ASME doi:10.1115/1.4043968 History: Received August 08, 2018; Accepted May 31, 2019

Abstract

The objective of this study is to examine the effect of the geometrical modification of the land on the overall film cooling effectiveness on the cutback region of a turbine blade model. A room temperature experiment was conducted, in which nitrogen serves as the cooling stream, and the mainstream flow is air. The adiabatic film cooling effectiveness was mapped employing the Pressure Sensitive Paint (PSP) technique. Data was acquired at five different blowing ratios (from 0.45 to 1.65) for both the baseline and the modified model. Detailed film cooling effectiveness from PSP measurements in correlation with the flow map in streamwise and spanwise planes from Particle Image Velocimetry (PIV) measurements were performed, characterizing the effect of rounding the edges of the lands. The results show that the rounded edges enable the coolant flow to reach the top surface of the land area more readily, especially at low blowing ratios. Superior coolant coverage on the land surface observed in the PSP measurements are well correlated with the PIV measurements. At the high blowing ratio of 1.65, the round edge of the lands helps regulate the mixing between the coolant and mainstream flows, therefore the film cooling effectiveness in the slot region is also improved.

Copyright © 2019 by ASME
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