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Investigate Of Centrifugal Compressor Stabilization Techniques

Research Authors
Fayez M. Wassef ; Hany A. Mohamed ; Ahmed S. Hassan and Mohamed A. Zaki
Research Member
Research Year
2005
Research Journal
Journal Of Engineering Sciences
Research Vol
Vol. 33, No. 6
Research Rank
1
Research_Pages
pp. 2129-2147
Research Abstract

Compressors have a limited stable operating range, due to occurrence of rotating stall and surge, so many techniques were introduced to increase its stability and more enhancements still are needed for optimum performance. Two different techniques for enhancing the compressor stability are investigated in the present work. The first technique makes use of splitters with different lengths located at various positions through the diffuser passages. In the second, radial grooves with different geometric parameters are manufactured through the compressor front casing matching with the diffuser passages and the vaneless regions. Influences of various geometric parameters on the stability of the compressor using the two techniques are studied. Enhancement in the flow and pressure coefficients at stall initiation of about 22.5 % and 4.4 % respectively, could be achieved by providing the compressor with diffuser splitters. Providing the compressor with radial grooves achieves an enhancement in the flow coefficient at stall initiation reaches to 45.5 %.
The flow coefficient at stall initiation resulted from the use of the radial grooves technique is given in a form of streamlines in terms of the grooves width and depth. The grooves width and depth required for optimum flow stability could be predicted from these streamlines for similar compressors.
The present experimental results show an acceptable agreement with those obtained by another author using similar compressor