Results 221 to 230 of about 1,878 (261)

Rotating Stall and Surge

Journal of Fluids Engineering, 1980
Safe off-design operation of compressors is limited to the region in which the flow is stable. Flow instabilities can be of two types, rotating stall and surge. The first of these subjects the blading to high oscillating stresses while the second may also have a disastrous effect on the whole system of which the compressor is a component. In this paper,
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Nonlinear Analysis of Rotating Stall

Journal of Engineering for Power, 1972
A new stall model to describe rotating stall in axial-flow compressors is established, where blade rows are replaced by semiactuator disks, flow fluctuations are permitted to be finite and nonsteady, and blade row characteristics are taken into consideration in nonlinear and nonsteady forms. Through numerical analysis using the finite difference method,
H. Takata, S. Nagano
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Numerical Simulation of Rotating Stall in a Subsonic Compressor

40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2004
Abstract Rotating stall is generally the first instability met in multi-stages compressors, before surge. This 3D phenomenon is characterized by one or more cells of stalled flow which rotate at a fraction of the rotor speed ω . The present paper deals with the simulation and the analysis of the rotating stall in a stage of a subsonic compressor ...
N. Gourdain, S. Burguburu, F. Leboeuf, H. Miton   +3 more
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Modeling and control of rotating stall and surge: an overview

Proceedings of the 1998 IEEE International Conference on Control Applications (Cat. No.98CH36104), 2002
Stable operation of both axial and radial compressors is constrained by rotating stall and surge. Developments in the understanding of the physics behind these instabilities, and ideas of how to stabilize the compressor system, have opened the door to a new era in the field of compressor control: so-called active control. The paper gives an overview of
Willems, F.P.T., de Jager, Bram
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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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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
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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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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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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
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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
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