Results 191 to 200 of about 1,822 (225)

Rotating Stall Characteristics in a Wide Vaneless Diffuser

Volume 6: Turbo Expo 2005, Parts A and B, 2005
Paper reports a numerical study on vaneless diffuser flow instability performed for the purpose of better understanding of rotating stall mechanism in radial vaneless diffusers. This analysis is restricted to the two-dimensional flow where effect of wall boundary layers is neglected.
Ljevar, S., Lange, de, H.C., Steenhoven, van, A.A.   +2 more
openaire   +2 more sources

Investigation of the Rotating Stall in a Centrifugal Compressor

Volume 1: Fora, Parts A and B, 2002
Instability of the compressor operation is manifested in two forms: by mild or deep surge. Both of them should be avoided as they lead to reduced performance or serious damage to the machine and its driving system. One of the pre-surge symptoms is rotating stall that appears mainly in the impeller and transfers to other parts of the compressor.
Longin Horodko, Wladyslaw Kryllowicz
openaire   +1 more source

Experimental Study of Rotational Effect on Stalling

Chinese Physics Letters, 2013
Tomographic particle image velocimetry (TPIV) and static pressure measurements are performed in a wind tunnel on a scaled model of the rotor blade of a 5 kW horizontal-axis wind turbine designed by using the blade element momentum method. This study is to investigate the physics of the stall-delay phenomenon observed for a rotating blade.
Hsiao Mun Lee, Yan-Hua Wu
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Rotating stall in axial compressors

Zeitschrift für angewandte Mathematik und Physik ZAMP, 1955
The phenomenon known as ‘rotating stall’ is described. Basically, it involves a nonuniform pattern of flow, steadily rotating relative to both the fixed and the rotating blades of axial-flow compressors. Attempts to analyze the phenomenon by means of small-perturbation theories are reviewed.
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Physical mechanism of rotational stall for HAWTs

AIP Conference Proceedings, 2012
Although most blade element momentum (BEM) models yields acceptable results for high tip-speed ratios where the local angles of attack are small, no generally accepted model exists up to date that consistently predicts the loads and power in stall regime for stall-controlled turbines. Understanding of the stall delay phenomenon on wind turbines remains,
H. Dumitrescu, F. Frunzulică, V. Cardos   +2 more
openaire   +1 more source

Delayed Stall Modeling of the Rotating Blades

AIP Conference Proceedings, 2010
Most aerodynamic design tools for horizontal‐axial wind turbines are based on the blade‐element momentum theory (BEM). Due to the nature of this theory, the design tools need 2‐D steady sectional lift and drag curves as an input. In practice, flow over a wind turbine rotor blade is neither two‐dimensional nor steady, and is affected by rotation ...
Alexandru Dumitrache, Vladimir Cardos, Horia Dumitrescu, Theodore E. Simos, George Psihoyios, Ch. Tsitouras   +5 more
openaire   +1 more source

Simulation of rotating stall by the vortex method

Journal of Propulsion and Power, 1985
The vortex method, coupled to a boundary-layer solver, is applied to the numerical simulation of high Reynolds number incompressible flow in two-dimensional cascades. Periodic conditions are imposed along the plane of the cascade, with several blades per period. Good agreement is found with two finite-difference methods for a single-blade case.
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Development of Rotating Stall Cell Under Coexisting Phenomena of Surge and Rotating Stall in an Axial-Flow Compressor

Volume 3A: Fluid Applications and Systems, 2019
Abstract The relationship between the growth of the stall cell and variation in the surge behavior was experimentally investigated. The aim of this study was to reveal the effect of the stall cell on the surge behavior from the viewpoint of the inner flow structure.
Yuu Sakata, Shuji Ando, Nobumichi Fujisawa, Yutaka Ohta   +3 more
openaire   +1 more source

Dämpfung von Rotating Stall in Radialverdichterstufen

Vakuum in Forschung und Praxis, 2001
Radialverdichter neigen im Teillastbereich zu rotierendem Ablosen der Stromung im Laufrad, das oft zu transienten Druckschwingungsvorgangen und zum "Pumpen" des Verdichters fuhrt. Betriebszustande im Teillastbereich mit transienten Vorgangen mussen vermieden werden, da sie den Verdichter und die Anlage durch Schwingungen gefahrden konnen.
openaire   +1 more source

Coherence analysis to detect unsteady rotating stall phenomenon based on pressure pulsation signals of a centrifugal pump

Mechanical Systems and Signal Processing, 2021
Ning Zhang, Dan Ni, Xiaokai Liu
exaly