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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

Выпуски:
Том 46, 2019 Том 45, 2018 Том 44, 2017 Том 43, 2016 Том 42, 2015 Том 41, 2014 Том 40, 2013 Том 39, 2012 Том 38, 2011 Том 37, 2010 Том 36, 2009 Том 35, 2008 Том 34, 2007 Том 33, 2006 Том 32, 2005 Том 31, 2004 Том 30, 2003 Том 29, 2002 Том 28, 2001 Том 27, 2000 Том 26, 1999 Том 25, 1998 Том 24, 1997 Том 23, 1996 Том 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v34.i1.40
pages 52-65

Steady and Unsteady Analysis of the Effects of Radial Gap Size in a Centrifugal Compressor Stage

Ning He
SPMP, Shanghai Port Machinary LTD, Shanghai, P.R. China

Краткое описание

In this paper, a computational analysis of a high-speed centrifugal compressor stage is presented. The main emphasis is placed on steady and unsteady investigations on the effect of different radial gap size between the leading edge of the vaned diffuser and the impeller tip on the detailed aerodynamics and the stage peak efficiency. The simulations were carried out for the stage with a backswept impeller and downstream vaned diffusers with different size of the radial gap. The impeller consisted of 8 full blades and 8 splitters and the downstream diffusers consisted of 22 vanes, with their leading edge at a radius of 1.075 and 1.150 times the radius of the impeller tip respectively. The steady and unsteady CFD analysis was carried out using the Reynolds-averaged Navier - Stokes solver CFX-TASCflow. For the steady state simulations, an averaging approach is used at the interface between the impeller and the diffuser. For the unsteady simulation, the method of geometry scaling is used in order to deal with the problem of unequal pitch. In this case one passage of the impeller was modeled in combination with three diffuser passages. The size of the radial gap influences considerably the detailed aerodynamic interactions in the vaneless and semi-vaneless space, the levels of unsteadiness and the amount of mixing occurring in this region. An important conclusion is that as the gap increases, the stage peak efficiency increases. The flow physics contributing to this result are quite complex and are addressed in the paper. The analysis was focused on impeller, vaneless space and vaned diffuser channel and comparisons with available experimental data are carried out.


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