Results 251 to 260 of about 32,011 (293)

Reduced-Order Modelling of Rotating Stall

Volume 2E: Turbomachinery, 2020
Abstract Rotating stall is a non-axisymmetric disturbance in axial compressors arising at operating conditions beyond the stability limit of a stage. Although well-known, its driving mechanisms determining the number of stall cells and their rotational speed are still marginally understood.
Dominik Schlüter, Robert P. Grewe, Fabian Wartzek, Alexander Liefke, Jan Werner, Christian Kunkel, Volker Gümmer   +6 more
openaire   +1 more source

Modeling for control of rotating stall

Automatica, 1994
Abstract An analytical model for control of rotating stall has been obtained from the basic fluid equations describing the process at inception. The model describes rotating stall as a traveling wave packet, sensed—in spatial components—via the Fourier decomposition of measurements obtained from a circumferential array of evenly distributed sensors ...
Paduano, J. D., Valavani, L., Epstein, A. H., Greitzer, E. M., Guenette, G. R.   +4 more
openaire   +1 more source

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.
openaire   +1 more source

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
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Rotating stall control for axial flow compressors

Proceedings of the 37th IEEE Conference on Decision and Control (Cat. No.98CH36171), 2001
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Belta, Calin, Gu, Guoxiang, Sparks, Andrew, Banda, Siva   +3 more
openaire   +2 more sources

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
openaire   +1 more source

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

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

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 the Onset of Rotating Stall

Fluids Engineering, 2001
Abstract This paper presents the results of a series of numerical simulations exploring the stability of fluid flow in vaneless diffusers of centrifugal compressors. Three-dimensional, time-dependent, Reynolds-averaged Navier-Stokes simulations were performed for a fixed diffuser width ratio.
Christopher J. Freitas, Anthony J. Smalley   +1 more
openaire   +1 more source