Heat transfer is a critical factor in the durability of gas turbine components, particularly in the first vane. An axisymmetric contour is sometimes used to contract the cross sectional area from the combustor to the first stage vane in the turbine. Such contouring can lead to significant changes in the endwall flows, thereby altering the heat transfer. This paper investigates the effect of axisymmetric contouring on the endwall heat transfer of a nozzle guide vane. Heat transfer measurements are performed on the endwalls of a planar and contoured passage whereby one endwall is modified with a linear slope in the case of the contoured passage. Included in this study is upstream leakage flow issuing from a slot normal to the inlet axis. Each of the endwalls within the contoured passage presents a unique flow field. For the contoured passage, the flat endwall is subject to an increased acceleration through the area contraction, while the contoured endwall includes both increased acceleration and a turning of streamlines due to the slope. Results indicate heat transfer is reduced on both endwalls of the contoured passage relative to the planar passage. In the case of all endwalls, increasing leakage mass flow rate leads to an increase in heat transfer near the suction side of the vane leading edge.
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e-mail: aat142@psu.edu
e-mail: kthole@psu.edu
e-mail: satoshi_hada@mhi.co.jp
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October 2011
Research Papers
Effects of an Axisymmetric Contoured Endwall on a Nozzle Guide Vane: Convective Heat Transfer Measurements
A. A. Thrift,
A. A. Thrift
Department of Mechanical and Nuclear Engineering,
e-mail: aat142@psu.edu
Pennsylvania State University
, State College, PA 16803
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K. A. Thole,
K. A. Thole
Department of Mechanical and Nuclear Engineering,
e-mail: kthole@psu.edu
Pennsylvania State University
, State College, PA 16803
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S. Hada
S. Hada
Takasago Machinery Works,
e-mail: satoshi_hada@mhi.co.jp
Mitsubishi Heavy Industries Ltd.
, Hyogo 676-8686, Japan
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A. A. Thrift
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, State College, PA 16803e-mail: aat142@psu.edu
K. A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, State College, PA 16803e-mail: kthole@psu.edu
S. Hada
Takasago Machinery Works,
Mitsubishi Heavy Industries Ltd.
, Hyogo 676-8686, Japane-mail: satoshi_hada@mhi.co.jp
J. Turbomach. Oct 2011, 133(4): 041008 (10 pages)
Published Online: April 20, 2011
Article history
Received:
June 30, 2010
Revised:
July 1, 2010
Online:
April 20, 2011
Published:
April 20, 2011
Citation
Thrift, A. A., Thole, K. A., and Hada, S. (April 20, 2011). "Effects of an Axisymmetric Contoured Endwall on a Nozzle Guide Vane: Convective Heat Transfer Measurements." ASME. J. Turbomach. October 2011; 133(4): 041008. https://doi.org/10.1115/1.4002966
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