Results 241 to 250 of about 2,271 (286)
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Journal of Fluids Engineering, Transactions of the ASME, 2015
It is known that a kind of stall precursor-suppressed (SPS) casing treatment can be used to enhance compressor stall margin (SM) without recognizable efficiency loss. The further requirement in this regard is to develop an effective way to determine the variation range of the SM improvement during the design of such SPS casing treatment.
Dakun Sun, Xiaofeng Sun, Sun Dakun
exaly +2 more sources
It is known that a kind of stall precursor-suppressed (SPS) casing treatment can be used to enhance compressor stall margin (SM) without recognizable efficiency loss. The further requirement in this regard is to develop an effective way to determine the variation range of the SM improvement during the design of such SPS casing treatment.
Dakun Sun, Xiaofeng Sun, Sun Dakun
exaly +2 more sources
Stall Margin Improvement by Casing Treatment—Its Mechanism and Effectiveness
Journal of Engineering for Power, 1977 Experiments on the effect of casing treatment were carried out using low-speed axial-flow compressors. Results on the overall compressor performance and on the flow through the blade row as well as the flow within the treatment slots are presented. Then, based on the experiments, a possible mechanism of the stall margin improvement is suggested.
H. Takata, Y. Tsukuda
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Surrogate-Based Shape Optimization of Stall Margin and Efficiency of a Centrifugal Compressor
Journal of Propulsion and Power, 2015 Centrifugal compressors are required to increase their operating range and efficiency, which are limited at low mass flow rates by the rotating stall and surge. This paper presents a surrogate-based multi-objective optimization of a centrifugal compressor to improve its efficiency and stall margin.
Khalfallah, Smail +3 more
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Effects of recessed blade tips on stall margin in a transonic axial compressor
Aerospace Science and Technology, 2016Abstract In this paper, a recessed blade tip was applied to a transonic axial compressor in expectation of increasing the stable operating range. The internal flow has been calculated by a commercial flow solver for different recess cavities on the blade tip and the predicted performances for each case have been compared with one another.
Yohan Jung +2 more
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Aerospace Science and Technology, 2022 In order to enhance the aerodynamic performance of a centrifugal compressor with a vaned diffuser while also improving its stall margin, squealer tip cavities were applied to the tips of the impeller blades.
Ali Zamiri +2 more
exaly +2 more sources
Using CFD to Improve Stall Margin
Fluids Engineering, 1999Abstract Centrifugal compressors for multi-stage industrial applications must have both high efficiency and stable operation over a wide flow range. CFD analyses were used to evaluate the stall margins of candidate impeller designs compared to a baseline semi-inducer design.
James R. Hardin, Charles F. Boal
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Determination of aircraft stall margins during takeoff
Journal of Aircraft, 1996Numerical Results In numerical examples a is assumed to be 1 rad. Table 1 shows a comparison study of the total induced drag between the present method and two kinds of lifting-line theories. Two lifting-line theories are unable to predict the near-field induced drag.
Sergey Kofman, Georges A. Becus
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Dynamic stall due to unsteady marginal separation
Journal of Fluid Mechanics, 1987A theoretical investigation into the next stage of dynamic stall, concerning the beginnings of eddy shedding from the boundary layer near an aerofoil's leading edge, is described by means of the unsteady viscous-inviscid interacting marginal separation of the boundary layer.
Elliott, J. W., Smith, F. T.
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Stall Margin Improvement by Use of Casing Treatments
Volume 6A: Turbomachinery, 2013The beneficial impact of casing treatments on the stall margin of tip-critical compressors has been proven many times. However, there is still no simple and general method to predict their actual effectiveness. The present work considers the axial velocity deficit that is generally observed at the blade tip. This so called tip-blockage is caused by the
Christian T. Pixberg +4 more
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The Effect of Steam Ingestion on Transonic Rotor Stall Margin
Volume 6: Turbo Expo 2007, Parts A and B, 2007The adverse effect of high temperature water vapor on the stall margin of a transonic compressor rotor is investigated. This type of flow condition is experienced during the takeoff of carrier born aircraft. An experiment is designed to replicate these flow conditions on a transonic compressor test rig.
A. J. Gannon +3 more
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