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TECHNICAL PAPERS: Gas Turbines: Controls, Diagnostics, and Instrumentation

Particle Image Velocimetry Measurements of the Three-Dimensional Flow in an Exhaust Hood Model of a Low-Pressure Steam Turbine

[+] Author and Article Information
Wei Zhang, Young Gil Jang

Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyo-Ja Dong, Pohang, 790-784, Korea

Bu Geun Paik

Maritime & Ocean Engineering Research Institute, KORDI, Jang-dong 171, Yuseong-gu, Daejeon, 305-343, Korea

Sang Joon Lee

Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyo-Ja Dong, Pohang, 790-784, Koreasjlee@postech.ac.kr

Su Eon Lee, Jin Hwan Kim

Turbine/Generator Business Group,Doosan Heavy Industries & Construction Co., Ltd.

J. Eng. Gas Turbines Power 129(2), 411-419 (Jul 30, 2006) (9 pages) doi:10.1115/1.2431387 History: Received April 15, 2005; Revised July 30, 2006

The three-dimensional flow structure inside an exhaust hood model of a low-pressure steam turbine was investigated using a particle image velocimetry (PIV) velocity field measurement technique. The PIV measurements were carried out in several selected planes under design operation conditions with simulated total pressure distribution and axial velocity profile. The mean flow fields revealed a complicated vortical flow structure and the major sources of energy loss. Vortices with different scales were observed inside the exhaust hood: a strong separation vortex (SV) behind the tip of the guide vane, a longitudinal vortex (LV) at the exhaust hood top, a large-scale passage vortex (PV) evolving throughout the flow path, and an end-wall vortex (EWV) in the region adjacent to the front end-wall. Both the SV and the large-scale PV seemed to consume large amounts of kinetic energy and reduce the pressure recovery ability. The results indicate that the steam guide vane and the bearing cone should be carefully designed so as to control the vortical flow structure inside the exhaust hood.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram and photograph of the exhaust hood model tested (units in mm), (a) longitudinal view; (b) end wall view, and (c) photograph

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Figure 2

Simulated experimental conditions in the annulus height at the entrance of the tested exhaust hood model: (a) axial velocity profile and (b) total pressure distribution (Pmax=2000Pa)

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Figure 3

Selected measurement planes through the flow passage of the exhaust hood model: (a) the vertical center plane and ZD1-ZD4 planes, (b) the horizontal center plane, and (c) the condenser neck flange

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Figure 4

Instantaneous velocity field in the horizontal center plane

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Figure 5

Mean flow field in the top vertical center plane (θ=180deg): (a) streamline distribution; (b) velocity magnitude contours, (c) vorticity contours, and (d) turbulent kinetic energy contours

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Figure 6

Mean flow field at section ZD1 (a) streamline distribution, (b) speed magnitude contours, and (c) vorticity contours

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Figure 7

Mean flow field at section ZD2: (a) streamline distribution, (b) speed magnitude contours, and (c) vorticity contours

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Figure 8

Mean flow field at section ZD3: (a) streamline distribution, (b) speed magnitude contours, (c) vorticity contours

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Figure 9

Mean flow field at section ZD4: (a) streamline distribution, (b) speed magnitude contours, (c) vorticity contours

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Figure 10

Mean flow field in the horizontal center plane: (a) velocity magnitude contours, (b) streamline distribution, (c) vorticity contours, and (d) turbulent kinetic energy contours

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Figure 11

Speed magnitude and streamline distribution at the condenser neck flange plane

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