Numerical Study of Unsteady Pulsed Suction through Endwall Bleed Holes in a Highly Loaded Compressor Cascade

Hongxin Zhang; Shaowen Chen; Songtao Wang; Zhongqi Wang

doi:10.1515/tjj-2018-0035

Article

Numerical Study of Unsteady Pulsed Suction through Endwall Bleed Holes in a Highly Loaded Compressor Cascade

Hongxin Zhang , Shaowen Chen , Songtao Wang and Zhongqi Wang

Published/Copyright: October 30, 2018

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From the journal International Journal of Turbo & Jet-Engines Volume 39 Issue 3

Abstract

Unsteady pulsed suction (UPS) was applied as an unsteady flow control (UFC) technique in a certain highly loaded compressor cascade to control the flow separations. Only two bleed holes symmetrically mounted on the endwalls (one on the upper endwall and another on the lower endwall) were set up to achieve steady constant suction (SCS) and UPS. The improvements in aerodynamic performance by SCS and UPS under different time-averaged suction flow rates are firstly investigated and compared. The related unsteady aerodynamic parameters of UPS such as excitation frequency, excitation location, pitch angle, and skew angle are discussed and analyzed in detail. The results show that UPS can provide a better flow control effect than SCS with the same time-averaged dimensionless suction flow rate in the control of flow separation. The aerodynamic performance of compressor cascades can be significantly enhanced by UPS when unsteady aerodynamic parameters are in their optimum ranges. Based on the optimum parameters for UPS, the total pressure loss coefficient is reduced by 19 % only with the time-averaged dimensionless suction flow rate m_s =0.4 %.

Keywords: unsteady pulsed holed suction; highly loaded compressor cascade; flow separation; unsteady aerodynamic parameters

PACS: 47.85.Gj

Funding statement: The work was supported by the National Natural Science Foundation of China (grant numbers 51776048 and 51436002).

Nomenclature

Notation
b: Chord length
CFD: Computational fluid dynamics
Cp: Time-averaged Static pressure coefficient
e: Pitch
Excited: Unsteady case with UPS
EXP: Experimental
f: Excitation frequency
f_e: Relative excitation frequency
f_shed: Natural frequency of vortex shedding
FFT: Fast Fourier Transformation
h: Blade height
i: Incidence angle
l: Axial chord length
m_s: Time-averaged dimensionless suction flow rate
N: Mesh number
p: Static pressure
p*: Total pressure
S: Strain rate tensor
SCS: Steady contant suction
SFC: Steady flow control
SST: Shear stress transport
T: One period
t: Simulation time
U: Velocity
UFC: Unsteady flow control
U_m: Maximum suction velocity
Unexcited: Unsteady case without suction
UPS: Unsteady pulsed suction
α: Pitch angle
β: Skew angle
γ: Stagger angle
θ ₁: Inflow angle
θ ₂: Outflow angle
∆θ: Camber angle
Ω: Rotation rate tensor
ϖ: Time-averaged total pressure loss coefficient
y+: Dimensionless wall distance
Subscripts
in: Inlet of the computational domain
out: Outlet of the computational domain
suction: Outlet of the bleed hole
*: Total condition

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Received: 2018-10-08

Accepted: 2018-10-22

Published Online: 2018-10-30

Published in Print: 2022-08-26

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Articles in the same Issue

https://doi.org/10.1515/tjj-2018-0035

Keywords for this article

unsteady pulsed holed suction; highly loaded compressor cascade; flow separation; unsteady aerodynamic parameters