Mechanics & Industry
Volume 15, Number 4, 2014
|Page(s)||253 - 265|
|Published online||20 June 2014|
Centrifugal compressor performance assessment under different impeller tip clearance sizes from far to near stall conditions
School of Mechanical Engineering, Iran University of Science and
Technology, Narmak, 16846-13114
a Corresponding author: email@example.com
Received: 8 August 2013
Accepted: 20 May 2014
Impeller tip clearance is a key parameter in design process of a centrifugal compressor which has influential effects on its aerodynamic and thermodynamic performances. Interaction of tip leakage flow with the main stream could be the major source for occurrence of stall phenomenon. In the present investigation, two impeller tip clearances of small and large sizes are investigated under different flow coefficients assigned to “design”, “low flow” and “high flow” conditions. Flow field is precisely simulated utilizing solution of the Reynolds-Averaged Navier-Stokes equations. Influence of the impeller stall on the volute flow field is studied. Structure of vortical flows within the impeller passages and volute are demonstrated in details. Numerical results showed that the flow within the volute becomes stall-prone while the flow within the impeller stalls. In contrast to the high flow case, the low flow condition was more prone for the stall occurrence. Performance tests were also conducted on Iran University of Science and Technology (IUST) centrifugal compressor test rig for validation of the numerical results.
Key words: stall / centrifugal compressor / performance map / tip clearance
© AFM, EDP Sciences 2014
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