Results 241 to 250 of about 32,011 (293)

Influence of Rotation on Dynamic Stall

Journal of the American Helicopter Society, 2013
A computational investigation of the effect of rotation on two-dimensional (2D) deep dynamic stall has been undertaken, showing that the effect of rotation is to reduce the severity of the pitching moment peak and cause earlier reattachment of the flow. A generic single blade rotor geometry was investigated, which had a pitching oscillation around the
Gardner, Anthony Donald, Richter, Kai
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Criteria for Spike Initiated Rotating Stall

Volume 6: Turbo Expo 2005, Parts A and B, 2005
A computational study to define the phenomena that lead to the onset of short length-scale (spike) rotating stall disturbances has been carried out. Unsteady simulations show there are two conditions necessary for the formation of spike disturbances, both of which are linked to the tip clearance flow. One is that the interface between the tip clearance
Huu Duc Vo, Choon S. Tan, Edward M. Greitzer   +2 more
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Investigating rotating stall

World Pumps, 2020
Rotating stall is a flow phenomenon which can induce high vibration and damage to a system. In this case, the problems were addressed through an engineering design review and modifications, preventing further issues and restoring efficiency.
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Rotating Stall in Axial Flow Compressors

Journal of the Aeronautical Sciences, 1957
The classical theories of linearized aerodynamics yields a complete description of the flow field due to the rotating stall in a two-dimensional cascade of airfoils, when the extension of the stalled region is small. The corresponding physical scheme can be used for larger stalled regions, without the limitations of the linearizing assumptions, if no ...
Fabri, Jean, Siestrunck, Raymond
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STABILITY ANALYSIS AND CONTROL OF ROTATING STALL

IFAC Proceedings Volumes, 1992
Issues of stability and control of rotating stall in axial flow compressor dynamics are considered. A stationary bifurcation analysis of compression system near the stall point is obtained, which shows that the stability of system can be predicted from either of two mathematical models of system, regarding the choice of state variables.
Der-Cherng Liaw, E.H. Abed
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The Number and Speed of Stall Cells During Rotating Stall

Volume 6: Turbo Expo 2003, Parts A and B, 2003
The number of stall cells and their rotational speed are distinctive features of the rotating stall phenomenon and play an important role in the prediction and analysis of the pressure fields during rotating stall. Various aspects of numbers and speed of stall cells are analyzed using an original interpretation method based on the pressure distribution
Y. Levy, J. Pismenny
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A theory for rotating stall in contra-rotating fans

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2020
This paper reports on a theory of rotating stall in contra-rotating fans and compressors. The theory is developed from Moore’s theory. A second-order hysteresis is used in the current study for the pressure rise of the counter-rotating rows. This enables the model to predict the transient behavior of the stall cell.
Hossein Khaleghi, Mohammad Javad Shahriyari, Martin Heinrich   +2 more
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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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High performance computing of compressor rotating stall and stall control

Integrated Computer-Aided Engineering, 2009
The performance of gas turbine engines is limited by compressor stall. Stall control technologies developed recently have demonstrated the effectiveness of steady tip injection to increase the stable operating range of high-speed axial and centrifugal compressors.
Chen, Jen-Ping, Webster, Robert S., Hathaway, Michael D., Herrick, Gregory P., Skoch, Gary J.   +4 more
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