NDLI: Numerical Investigations of Cooling Enhancement With Internal Ribs and External Coolant Film

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Feng, Zhixin Dou, Zhongwang Wang, Jianhua Ma, Shiyan Zhang, Zhiqiang
Copyright Year	2012
Abstract	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.
Sponsorship	International Gas Turbine Institute
Starting Page	243
Ending Page	253
Page Count	11
File Format	PDF
ISBN	9780791844700
DOI	10.1115/GT2012-68682
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2012-06-11
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Temperature Turbulence Cooling Blades Reynolds number High temperature Flow (dynamics) Heat conduction Gas turbines Eddies (fluid dynamics) Shear stress Coolants Film cooling Kinetic energy
Content Type	Text
Resource Type	Article

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