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http://dx.doi.org/10.3795/KSME-B.2007.31.1.068

A Three-Dimensional Numerical Simulation of Rotating Stall in an Axial Compressor  

Choi, Min-Suk (포항공과대학교 대학원 기계공학과)
Oh, Seong-Hwan (국방과학연구소)
Ki, Dock-Jong (국방과학연구소)
Baek, Je-Hyun (포항공과대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.31, no.1, 2007 , pp. 68-75 More about this Journal
Abstract
A three-dimensional computation is conducted to simulate a three-dimensional rotating stall in a low speed axial compressor. It is generally known that a tip leakage flow has an important role on a stall inception. However, almost of researchers have taken no interest in a role of the hub-comer-stall on the rotating stall even though it is a common feature of the flow in an axial compressor operating near stall and it has a large effect on the flows and loss characteristics. Using a time-accurate unsteady simulation, it is found that the hub-comer-stall may be a trigger to collapse the axisymmetric flows under high loads. An asymmetric disturbance is initially originated in the hub-comer-stall because separations are naturally unstable flow phenomena. Then this disturbance is transferred to the tip leakage flows from the hub-comer-stall and grows to be stationary stall cells, which adheres to blade passage and rotate at the same speed as the rotor. When stationary stall cells reach a critical size, these cells then move along the blade row and become a short-length-scale rotating stall. The rotational speed of stall cells quickly comes down to 79 percent of rotor so they rotate in the opposite direction to the rotor blades in the rotating frame.
Keywords
Rotating Stall; Hub-Corner-Stall; Axial Compressor; Numerical Simulation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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