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Large Eddy Simulations of Separated Shear Layer Behaviors in a High-Lift LP Turbine

[+] Author Affiliations
Weihao Zhang, Zhengping Zou

Beihang University, Beijing, China

Jian Ye

Chongqing University, Chongqing, China

Paper No. GT2015-43054, pp. V02AT38A022; 14 pages
doi:10.1115/GT2015-43054
From:
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 2A: Turbomachinery
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5663-5
  • Copyright © 2015 by ASME

abstract

Separated shear layer behaviors under the conditions without and with elevated inlet freestream turbulence intensity (FSTI=2.5%) are investigated by using large eddy simulations (LES) in this paper. The study is performed on a low-Re high-lift LP turbine blade (T106D-EIZ) at Reynolds number (Re) of 60,154 (based on the chord and outflow velocity) and isentropic exit Mach number of 0.402. A number of detection points are set along the dividing streamlines and long time series of data are gathered. The time-mean flow and the transient vortex structures are discussed, which indicated the FSTI can suppress the open separation and thus improve the aeroperformance. Power spectra and wavelet analysis are applied to axial velocity and pressure signals of the detection points. The results show that although the vortices pairing are missed, the subharmonic of the roll-up frequency is still observable under the elevated FSTI condition. It is also found that both of the locations and power of the vortices roll-up, as well as vortices pairing, vary with time in large scales and these phenomena are weakened under the elevated FSTI condition.

Copyright © 2015 by ASME

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