Experimental and numerical investigations were carried out to study the average cooling performance of two different rectangular structures: 1) purely ribbed channel (only ribs were periodically embedded inner the wall of the structure); 2) combined structure of film cooling with the ribs (in the ribbed wall, film holes were periodically drilled). To create a similar environment of gas turbine blade, the experiments were performed at a high temperature mainstream, and the ambient temperature cooling air passed through the channel with the direction normal to the mainstream. In the experimental and numerical investigations, the overall cooling effect contributed by the heat conduction through channel’s wall and convections including internal ribbed wall and external film cooling was considered. In the numerical investigation, 3D conservation equations including mass, momentum, energy, turbulence eddy frequency and turbulence kinetic energy equations were solved with ANSYS-CFX, and the hybrid mesh technique and shear stress transport (SST) k-ω model were adopted. This numerical approach was validated by the experimental data. Using the validated numerical approach, the influence factors on the overall cooling effectiveness are discussed, and the effects of the internal ribs and external film cooling are numerically compared by the two structures. The relationship of the overall cooling effectiveness averaged over the rectangular surface with the mainstream Reynolds number, mass flow ratio and temperature ratio of the mainstream to cooling air, as well as the blowing ratio injected through the film holes was fitted by the numerical results.
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ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
June 11–15, 2012
Copenhagen, Denmark
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4470-0
PROCEEDINGS PAPER
Numerical Investigations of Cooling Enhancement With Internal Ribs and External Coolant Film
Zhixin Feng,
Zhixin Feng
University of Science and Technology of China, Hefei, Anhui, China
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Zhongwang Dou,
Zhongwang Dou
University of Science and Technology of China, Hefei, Anhui, China
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Jianhua Wang,
Jianhua Wang
University of Science and Technology of China, Hefei, Anhui, China
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Shiyan Ma,
Shiyan Ma
Aeroengine Institute of Aviation Industry Corporation of China, Shenyang, Liaoning, China
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Zhiqiang Zhang
Zhiqiang Zhang
Aeroengine Institute of Aviation Industry Corporation of China, Shenyang, Liaoning, China
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Zhixin Feng
University of Science and Technology of China, Hefei, Anhui, China
Zhongwang Dou
University of Science and Technology of China, Hefei, Anhui, China
Jianhua Wang
University of Science and Technology of China, Hefei, Anhui, China
Shiyan Ma
Aeroengine Institute of Aviation Industry Corporation of China, Shenyang, Liaoning, China
Zhiqiang Zhang
Aeroengine Institute of Aviation Industry Corporation of China, Shenyang, Liaoning, China
Paper No:
GT2012-68682, pp. 243-253; 11 pages
Published Online:
July 9, 2013
Citation
Feng, Z, Dou, Z, Wang, J, Ma, S, & Zhang, Z. "Numerical Investigations of Cooling Enhancement With Internal Ribs and External Coolant Film." Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 4: Heat Transfer, Parts A and B. Copenhagen, Denmark. June 11–15, 2012. pp. 243-253. ASME. https://doi.org/10.1115/GT2012-68682
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