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Particle image velocimetry measurements of the three-dimensional flow in an exhaust hood model of a low-pressure steam turbine

Authors
Zhang, WeiPaik, Bu GeunJang, Young GilLee, Sang JoonLee, Su EonKim, Jin Hwan
Issue Date
4월-2007
Publisher
ASME
Keywords
exhaust hood; low-pressure steam turbine; PIV
Citation
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME, v.129, no.2, pp 411 - 419
Pages
9
Journal Title
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
Volume
129
Number
2
Start Page
411
End Page
419
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/1406
DOI
10.1115/1.2431387
ISSN
0742-4795
1528-8919
Abstract
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 exhausi 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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Paik, Bu Geun
지능형선박연구본부 (함정공학연구센터)
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