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http://dx.doi.org/10.5293/KFMA.2004.7.2.027

Numerical Analysis on the Performance Prediction of a Centrifugal Compressor with Relative Positions of Tandem Diffuser Rows  

Noh, Jun-Gu (한국항공우주연구원)
Kim, Jin-han (한국항공우주연구원)
Publication Information
The KSFM Journal of Fluid Machinery / v.7, no.2, 2004 , pp. 27-34 More about this Journal
Abstract
The performance of a centrifugal compressor composed of an impeller, tandem diffuser rows and axial guide vanes has been predicted numerically and compared with available experimental results on its design rotational speed. The pitchwise-averaged mixing plane method was employed for the boundaries between rotor and stator to obtain steady state solutions. The overall characteristics showed difference according to the relative positions of tandem diffuser rows while the characteristics of impeller showed almost identical result. The numerical results agree with the measured data in respect of their tendency. It turned out that $0\%$ of relative positions is the worst case in terms of static pressure recovery and efficiency. According to the experimental results, some pressure fluctuations and malfunction of the compressor were observed for $75\%$ case. However, this numerical calculation using mixing plane method did not capture any of those phenomena. Thus, unsteady flow calculation should be performed to investigate the stability of the compressor caused by different diffuser configuration.
Keywords
Turboshaft engine; Centrifugal compressor; Tandem diffuser;
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