Three-dimensional unsteady flow and forces in centrifugal impellers with circumferential distortion of the outlet static pressure

Journal Article · Wed Jan 01 00:00:00 EST 1997 · Journal of Turbomachinery

DOI:https://doi.org/10.1115/1.2841015· OSTI ID:438783

Fatsis, A; Pierret, S; Braembussche, R van den ^[1]

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1. von Karman Inst. for Fluid Dynamics, Rhode-St.-Genese (Belgium). Turbomachinery Dept.

This paper describes the numerical investigation of the centrifugal impeller response to downstream static pressure distortions imposed by volutes at off-design operations. An unsteady three-dimensional Euler solver with nonreflecting upstream and downstream boundary conditions and phase-lagged periodicity conditions is used for this purpose. The mechanisms governing the unsteady flow field are analyzed. A parametric study shows the influence of the acoustic Strouhal number on the amplitude of the flow perturbations. Radial forces calculated on backward leaned and radial ending centrifugal impellers show nonnegligible influence of the impeller geometry.

• Sponsoring Organization: USDOE
• OSTI ID: 438783
• Report Number(s): CONF-950629-; ISSN 0889-504X; TRN: IM9711%%247
• Journal Information: Journal of Turbomachinery, Vol. 119, Issue 1; Conference: 40. International gas turbine and aeroengine congress and exposition, Houston, TX (United States), 5-8 Jun 1995; Other Information: PBD: Jan 1997
• Country of Publication: United States
• Language: English

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