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research-article

The Development and Mechanisms of the High Pressure Turbine Vane Wake Vortex

[+] Author and Article Information
Dun Lin

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Beijing 100084, China
lindun91@gmail.com

Xinrong Su

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Beijing 100084, China
suxr@mail.tsinghua.edu.cn

Xin Yuan

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Beijing 100084, China
yuanxin@mail.tsinghua.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039802 History: Received April 25, 2017; Revised February 26, 2018

Abstract

The wake vortex is an important origin of unsteadiness and losses in the turbine. In this paper, the development and underlying mechanisms of the shedding vortex of a high-pressure transonic turbine vane are studied and analyzed using the Delayed Detached Eddy Simulation (DDES) and Proper Orthogonal Decomposition (POD). Special attention is paid to the mechanisms behind the length characteristics. Interactions of the wake vortex with the shock wave and pressure waves are also discussed. First, the DDES simulation results are compared with published experimental data, Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES). Then, the development of the vane wake vortex, especially the different length characteristics from the cylinder vortex, is discussed. The reason of stronger pressure-side vortex shedding compared to suction-side vortex shedding is revealed. Wake-shock wave interaction and wake-pressure waves interactions are investigated. The pressure waves are found to have a stronger effect than the shock wave on the span-wise motion and the dissipation of the wake vortex. An analysis of the development of loss through the turbine vane passage is carried out to evaluate the contributions of thermal and viscous irreversibilities. Losses analysis also confirm the strong interaction between the wake vortex and pressure waves. After that, spatial and temporal POD study of the wake behaviour was carried out. The results indicate that the shedding vortex are dominant in the unsteady flow. The phase relation between the pressure side wake vortex and the suction side wake vortex are confirmed.

Copyright (c) 2018 by ASME
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