Results 261 to 270 of about 46,935 (306)
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Aerospace Science and Technology, 2018
Abstract This paper presents the stall margin enhancement of a novel casing treatment subjected to circumferential pressure inlet distortion. Experimental results are carried out on a low-speed compressor. Experimental results show that the stall margin of the test compressor is gravely narrowed by circumferential pressure inlet distortion.
Xu Dong +3 more
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Abstract This paper presents the stall margin enhancement of a novel casing treatment subjected to circumferential pressure inlet distortion. Experimental results are carried out on a low-speed compressor. Experimental results show that the stall margin of the test compressor is gravely narrowed by circumferential pressure inlet distortion.
Xu Dong +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.
Young-Jin Jung +4 more
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Reliability-based design optimization of axial compressor using uncertainty model for stall margin
Journal of Mechanical Science and Technology, 2011Reliability-based design optimization (RBDO) of the NASA stage 37 axial compressor is performed using an uncertainty model for stall margin in order to guarantee stable operation of the compressor. The main characteristics of RBDO for the axial compressor are summarized as follows: First, the values of mass flow rate and pressure ratio in stall margin ...
Sangwon Hong +6 more
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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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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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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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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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Journal of Turbomachinery, 2015
A kind of casing treatment, named as stall precursor-suppressed (SPS), has been developed recently, which was proved to be able to effectively improve stall margin (SM) without significant efficiency loss in low-speed axial flow compressors and a transonic compressor rotor. In this paper, the effectiveness of the SPS casing treatment is investigated in
Dakun Sun +4 more
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A kind of casing treatment, named as stall precursor-suppressed (SPS), has been developed recently, which was proved to be able to effectively improve stall margin (SM) without significant efficiency loss in low-speed axial flow compressors and a transonic compressor rotor. In this paper, the effectiveness of the SPS casing treatment is investigated in
Dakun Sun +4 more
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Active Compressor Stability Management via a Stall Margin Control Mode
Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation; Education; Electric Power; Awards and Honors, 2009An active engine control scheme for protection against compressor instabilities such as rotating stall and surge is presented. Compressor stability detection is accomplished via a parameter known as the correlation measure, which quantifies the repeatability of the pressure fluctuations in the tip region of a compressor rotor.
Yuan Liu, Manuj Dhingra, J. V. R. Prasad
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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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