Study of blade to blade flows and circumferential stall propagation in radial diffusers and radial fans by vortex cloud analysis

Lewis, R. Ivan (2004) Study of blade to blade flows and circumferential stall propagation in radial diffusers and radial fans by vortex cloud analysis. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 5 (2). pp. 323-335. ISSN 1586-2070

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Abstract

The objective of this paper is extension of vortex cloud simulation to the study of deep rotating stall cell propagation in radial turbomachines. Previous studies [1][2] provided the basic analysis, summarized in part here, for radial and mixed-flow blade rows but with identical blade-to-blade flow. Lifting of this restriction here permits the natural development of circumferential flow variations, revealing the growth of major upstream rotating stall cells for a radial diffuser with ten log-spiral blades but with high angle of attack (deep stall). For the same blade row run as a radial fan, however, stall cell formation and propagation is found to be inhibited. Additional studies are included for a cambered blade geometry typical of axial compressors. Used as an eight bladed radial diffuser, classical rotating stall is predicted. When operated as a rotor, rotating is again inhibited and modified.

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