Development of a performance prediction method for centrifugal compressor channel diffusers |
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Authors: | Jeong-Seek Kang Sung-Kook Cho Shin-Hyoung Kang |
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Affiliation: | (1) Turbomachinery Department, Korea Aerospace Research Institute, Yusung, P.O.Box 113, 305-600 Daejeon, Korea;(2) School of Mechanical and Aerospace Engineering, Seoul National University Shinlim-Dong, Kwanak-Gu, 151-742 Seoul, Korea |
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Abstract: | A hybrid performance prediction method is proposed in the present study. A channel diffuser is divided into four subregions:
vaneless space, semi-vaneless space, channel, and channel exit region. One-dimensional compressible core flow and boundary
layer calculation of each region with an incidence loss model and empirical correlation of residuary pressure recovery coefficient
of a channel predict the performance of diffusers. Three channel diffusers are designed and tested for validating the developed
prediction method. The pressure distributions from an impeller exit to the channel diffuser exit are measured and discussed
for various operating conditions from choke to nearly surge conditions. The strong non-uniform pressure distribution which
is caused by impeller-diffuser interaction is obtained over the vaneless and semi-vaneless spaces. The predicted performance
shows good agreement with the measured performance of diffusers at a design condition as well as at off-design conditions. |
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Keywords: | Channel Diffuser Performance Prediction Centrifugal Compressor Off-Design Performance Prediction Pressure Distribution |
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