Results 231 to 240 of about 811 (268)

Effect of blade squealer tips on aerodynamic performance and stall margin in a transonic centrifugal compressor with vaned diffuser

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, Minsuk Choi, Jin Taek Chung   +2 more
exaly   +2 more sources

Single and Multiple Circumferential Casing Groove for Stall Margin Improvement in a Transonic Axial Compressor

Journal of Turbomachinery, 2021
The stability limit of a tip-stalling axial compressor is sensitive to the magnitude of the near-casing blockage. In transonic compressors, the presence of the passage shock could be a major cause for the blockage.
Vasudevan Kanjirakkad (4463632), Ahmad Fikri Bin Mustaffa (4466614)   +1 more
exaly   +3 more sources

Stall margin improvement in a low-speed axial compressor rotor using a blockage-optimised single circumferential casing groove

Journal of the Global Power and Propulsion Society, 2021
The stall margin of tip-critical axial compressors can be improved by using circumferential casing grooves. From previous studies, in the literature, the stall margin improvement due to the casing grooves can be attributed to the reduction of the near ...
Ahmad Fikri Mustaffa, Vasudevan Kanjirakkad   +1 more
exaly   +1 more source

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Using CFD to Improve Stall Margin

Fluids Engineering, 1999
Abstract 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
openaire   +1 more source

Stall Margin Improvement by Use of Casing Treatments

Volume 6A: Turbomachinery, 2013
The 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, Heinz-Peter Schiffer, M. H. Ross, J. D. Cameron, S. C. Morris   +4 more
openaire   +1 more source

An Experimental Investigation on the Mechanism of Stall Margin Improvement of Casing Treatment

Volume 1: Aircraft Engine; Turbomachinery, 1985
A single-rotor axial flow compressor and a two-dimensional cascade have been tested with and without casing treatment. A three-dimensional flow mechanism of the onset of rotating stall is suggested. It gives good reason to explain the mechanism of stall-margin improvement of casing treatment.
Zhuang Ping, Lu Ya-Jun, Li Bao-Ju, Feng Yu-Chen   +3 more
openaire   +1 more source

Review of tip air injection to improve stall margin in axial compressors

Progress in Aerospace Sciences, 2019
Abstract The present paper provides a summary of investigations of the tip air injection, which has been studied for over 30 years to extend the stall margin in axial flow compressors. The review covers the design of injected parameters, understanding of stability-enhancing mechanism, application of active control, and self-recirculation based on tip
Jichao Li, Juan Du, Chaoqun Nie, Hongwu Zhang   +3 more
openaire   +1 more source

Stall Margin Improvement in a Transonic Compressor With a Casing Treatment: Flow Mechanism

Journal of Turbomachinery, 2022
Abstract A compressor casing treatment with circumferential casing grooves (CCGs) is studied in detail. The primary objective of the current paper is to unearth the main driving fluid mechanism that changes the stall margin in a transonic compressor with CCGs.
openaire   +1 more source

Stall Margin Improvement in a Centrifugal Compressor Through Endwall Reshaping

ASME 2012 Gas Turbine India Conference, 2012
This paper presents the results of numerical studies on the effect of endwall reshaping on the performance and stall margin of a centrifugal compressor. The endwall (shroud) of a baseline compressor was reshaped by introducing a convex hump at a location downstream of the inducer where the flow turns from axial to radial direction.
Suhas R. Sope, Quamber H. Nagpurwala
openaire   +1 more source

Flow Mechanism for Stall Margin Improvement Due to Circumferential Casing Grooves on Axial Compressors

Volume 5: Turbo Expo 2004, Parts A and B, 2004
A computational study is carried out to understand the physical mechanism responsible for the improvement in stall margin of an axial flow rotor due to the circumferential casing grooves. It is shown that the computational tool used predicts an increase in operating range of the rotor when casing groves are present.
Aamir Shabbir, John J. Adamczyk
openaire   +1 more source