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RESEARCH PAPERS

Vortex Simulation of Propagating Stall in a Linear Cascade of Airfoils

[+] Author and Article Information
C. G. Speziale

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332

F. Sisto, S. Jonnavithula

Mechanical Engineering Department, Stevens Institute of Technology, Hoboken, NJ 07030

J. Fluids Eng 108(3), 304-312 (Sep 01, 1986) (9 pages) doi:10.1115/1.3242578 History: Received October 21, 1985; Online October 26, 2009

Abstract

A numerical simulation of propagating stall in a linear cascade of airfoils at high Reynolds numbers is conducted using a vortex method which was first developed by Spalart [7] for this problem. In this approach, the vorticity is discretized into a large collection of vortex blobs whose motion is tracked in time by the use of a well-known vortex tracing algorithm based on the Euler equation. The near-wall effects of viscosity are accounted for by the creation of discrete vortex sheets at the boundaries of the airfoils consistent with the no-slip condition. These boundary vortices are then released into the flow field downstream of the separation points which are obtained from a boundary-layer routine. Calculations are presented for a variety of flow geometries. It is demonstrated that (for a given cascade of airfoils, disturbance wavelength, and stagger angle) several different flow regimes are obtained: Attached flow at lower angles of attack and a chaotic deep stall configuration at larger angles of attack with a narrow intermediate range of such angles where propagating stall occurs. The physical characteristics of this propagating stall are parameterized and a quantitative study of the effects of camber and imposed wavelength is conducted. Comparisons are made with previous theoretical and experimental studies.

Copyright © 1986 by ASME
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