On the Use of Atmospheric Boundary Conditions for Axial-Flow Compressor Stall Simulations

[+] Author and Article Information
M. Vahdati, A. I. Sayma, M. Imregun

Mechanical Engineering Department,  Imperial College, Exhibition Road, London SW7 2BX, UK

C. Freeman

 Rolls-Royce plc, PO Box 31, Moor Lane, Derby DE24 8BJ, UK

The contribution of the Reviewers is gratefully acknowledged.

J. Turbomach 127(2), 349-351 (Aug 27, 2004) (3 pages) doi:10.1115/1.1861912 History: Received March 01, 2004; Revised August 27, 2004

This paper describes a novel way of prescribing computational fluid dynamics (CFD) boundary conditions for axial-flow compressors. The approach is based on extending the standard single passage computational domain by adding an intake upstream and a variable nozzle downstream. Such a route allows us to consider any point on a given speed characteristic by simply modifying the nozzle area, the actual boundary conditions being set to atmospheric ones in all cases. Using a fan blade, it is shown that the method not only allows going past the stall point but also captures the typical hysteresis loop behavior of compressors.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Computational domains for Strategies 1 and 2

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Figure 2

Compressor characteristic at 70%. Strategy 1 predictions, Strategy 2 predictions and measured data

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Figure 3

Computed vs measured at design speed and 70% part-speed

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Figure 4

Time history for blade lift



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