THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Yunsong Zhang

,

Yongbao Liu

,

Yujie Li

,

Qijie Li

NUMERICAL STUDY ON AEROTHERMAL PERFORMANCE OF SHROUD MOVEMENT IN THE VIVINITY OF TURBINE TIPS

ABSTRACT
In this paper, the effects of shroud movement on transonic flow and heat transfer in the vicinity of turbine tip was studied by using 3-D simulation of GE-E3 first-stage high pressure turbine. Aerothermal performance and flow structure were analyzed with and without turbine shroud moving, respectively. Based on the distribution of limiting streamlines and the vortex structures, the influential characteristics between the leakage flow and the secondary flow generated by shroud movement were studied. Moreover, the coefficient of heat transfer at the wall was investigated. Results show that the flow structure is changing with the movement of turbine shroud, and the location of the separation-line changes significantly by the influence of the secondary flow. The leakage vortex initial location delayed in axial direction and its breakdown point located at 65% cross-section. This accelerates the mixing loss and increase the perturbation. In addition, it is observed that the coefficient of average heat transfer is increased obviously by 54.8% in the region of shroud surface. However, this coefficient in the region of suction surface decreased by 11.9%.
KEYWORDS
blade tip region, transonic flow, shroud movement, leakage vortex
PAPER SUBMITTED: 2020-06-28
PAPER REVISED: 2020-08-31
PAPER ACCEPTED: 2020-09-24
PUBLISHED ONLINE: 2020-10-31
DOI REFERENCE: https://doi.org/10.2298/TSCI200628321Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 5, PAGES [3365 - 3375]
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Numerical study on aerothermal performance of shroud movement in the vivinity of turbine tips

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence