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research-article

Detached-Eddy Simulation Applied to Aeroelastic Stability Analysis in a Last-stage Steam Turbine Blade

[+] Author and Article Information
Tianrui Sun

Dormitory Building 11#, Beihang University, Xueyuan Road 37#, Haidian District Beijing, Beijing 100191 China mengzhuanjingshi@yeah.net

Paul Petrie-Repar

Brinellvägen 68 Stockholm, 10044 Sweden paul.petrie-repar@energy.kth.se

Damian M. Vogt

Pfaffenwaldring 6 Stuttgart, 70569 Germany damian.vogt@itsm.uni-stuttgart.de

Anping Hou

School of Jet Propulsio,Beijing University of Aeronautics and Astronautics, Beijing, China Beijing, 100083 China houap@buaa.edu.cn

1Corresponding author.

Manuscript received October 1, 2018; final manuscript received March 30, 2019; published online xx xx, xxxx. Assoc. Editor: Rakesh Srivastava.

ASME doi:10.1115/1.4043407 History: Received October 01, 2018; Accepted April 02, 2019

Abstract

Blade flutter in the last stage is an important design consideration for the manufacturers of steam turbines. Therefore, the accurate prediction method for blade flutter is critical. Since the majority of aerodynamic work contributing to flutter is done near the blade tip, resolving the tip leakage flow can increase the accuracy of flutter predictions. Previous research has shown that the induced vortices in the tip region can have a significant influence on the flow field near the tip. The structure of induced vortices due to the tip leakage vortex cannot be resolved by URANS simulations because of the high dissipation in turbulence models. To the best of author's knowledge, the influence of induced vortices on flutter characteristics has not been investigated. In this paper, the results of DES and URANS flutter simulations of a realistic-scale last stage steam turbine are presented and the influence of induced vortices on the flutter stability is investigated. Significant differences for the predicted aerodynamic work coefficient distribution on the blade surface, especially on the rear half of the blade suction side near the tip are observed. At the least stable IBPA, the induced vortices show a destabilization effect on blade aeroelastic stabilities. The motion of induced vortices is dependent on the blade amplitude and hence the aerodynamic damping is also dependent on the blade vibration amplitude. In conclusion, the induced vortices can influence the predicted flutter characteristics of the steam turbine test case.

Copyright © 2019 by ASME
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