Study on flow characteristics of low-pressure turbine boundary layer based on
	
	
		multiple analysis methods

Abstract

Abstract:

To investigate the unsteady flow characteristics of the low-pressure turbine suction surface boundary layer of an

aero-engine under the influence of wake, the commercial software CFX 15.0 was used for numerical simulation in

this paper, and a cascade test platform with an upstream wake simulation function was used for experimental verification. Firstly, three different upstream reduced frequencies of wakes were achieved by changing the speed of the

upstream wake bar while keeping the axial velocity unchanged. Then, by numerical simulation, the flow field data

of the low-pressure turbine suction surface boundary layer under three conditions were obtained and compared.

Three new flow field analysis methods including proper orthogonal decomposition (POD), dynamic mode decomposition (DMD) and Fourier mode decomposition (FMD), were used in the analysis. The results show that, under the

three reduced frequencies, the height of the wake center from the blade surface differs greatly when it passes

through the separation area. The influence degree of the wake in the suction surface boundary layer and the main

identified characteristics are also very different under the influence of wake.

Key words:

low-pressure turbine, boundary layer, wake, separation, roll-up vortex

CLC Number:

V231.3

SUN Shuang, HUANG Zhen, KANG Jinhui, SUN Xiaopeng, WANG Maomao, LU Lehan.

Study on flow characteristics of low-pressure turbine boundary layer based on

multiple analysis methods

[J]. Journal of Civil Aviation University of China, 2024, 42(5): 36-44.

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Study on flow characteristics of low-pressure turbine boundary layer based on

multiple analysis methods

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