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Purge and Secondary Flow Interaction Control by Means of Platform Circumferential Contouring

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Date Issued:
2011
Abstract/Description:
This study presents an attempt to reduce the losses produced by the purge flow in a turbine stage by incorporating circumferential platform contouring. Two contours are proposed and compared against a baseline at different levels of swirl. The computational simulations were performed using a RANS three-dimensional Computational Fluid Dynamics code with the Shear Stress Transport turbulence model. The results of steady simulations demonstrate that for the first contour, when the flow is swirled to 50% of the rim speed, the purge flow exits the cavity with less cross flow. This in turn reduces the strength of the passage vortex. However, at swirl extremes of 0% and 100% the baseline has the best performance. The results show that a carefully designed platform has the potential to reduce losses when the operating condition is in the proximity of 50% swirl.
Title: Purge and Secondary Flow Interaction Control by Means of Platform Circumferential Contouring.
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Name(s): Seco Soley, Melissa, Author
Kapat, Jayanta, Committee Chair
Deng, Weiwei, Committee Member
Gordon, Ali, Committee Member
, Committee Member
University of Central Florida, Degree Grantor
Type of Resource: text
Date Issued: 2011
Publisher: University of Central Florida
Language(s): English
Abstract/Description: This study presents an attempt to reduce the losses produced by the purge flow in a turbine stage by incorporating circumferential platform contouring. Two contours are proposed and compared against a baseline at different levels of swirl. The computational simulations were performed using a RANS three-dimensional Computational Fluid Dynamics code with the Shear Stress Transport turbulence model. The results of steady simulations demonstrate that for the first contour, when the flow is swirled to 50% of the rim speed, the purge flow exits the cavity with less cross flow. This in turn reduces the strength of the passage vortex. However, at swirl extremes of 0% and 100% the baseline has the best performance. The results show that a carefully designed platform has the potential to reduce losses when the operating condition is in the proximity of 50% swirl.
Identifier: CFE0004163 (IID), ucf:49054 (fedora)
Note(s): 2011-12-01
M.S.M.E.
Engineering and Computer Science, Mechanical, Materials and Aerospace Engineering
Masters
This record was generated from author submitted information.
Subject(s): purge flow -- secondary flow -- fluid dynamics -- turbine -- high pressure turbine -- cavity -- rim seal -- cooling flows
Persistent Link to This Record: http://purl.flvc.org/ucf/fd/CFE0004163
Restrictions on Access: public 2011-12-15
Host Institution: UCF

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