Analysis on joint adjusting of a two-stage centrifugal compressor with inter-stage cooling and variable guide vanes

doi:10.12028/j.issn.2095-4239.2016.0010

Abstract

Abstract: A numerical model of a two-stage centrifugal compressor with inter-stage cooling and variable guide vanes has been developed. Analyses are made using the model on the performance of the compressor while the two-stage vanes are adjusted. The results illustrate that when each of the two-stage guide vanes adjusted, they follows the same rules: a positive opening of the guide vane improves the stall features; a negative opening leads to a pressure ratio increase.; but the isentropic efficiency drops for both the positive or negative openings of the vane. When two-stage guide vanes are adjusted jointly using the zero opening as the reference, the pressure ratio increases only when the opening of two-stage guide vanes are all negative whereas the pressure ratio decreases in all other cases. The isentropic efficiency of all opening cases is lower than that at the reference condition. Internal flow analyses suggest that the uniformity of the internal flow of the second stage can be improved through jointly adjusting the two vanes. The effect of adjusting the guide vanes of the two stages is the same on the performance of the two-stage centrifugal compressor. When the opening of first stage guide vane changes from negative to positive, the area of high velocity at the suction surface of the impeller inlet shroud decreases, concentrating on the pressure surface around the shroud.

Key words: two-stage centrifugal compressor, interstage cooling, adjustable guide vane, joint adjusting

YAN Xue1,2, ZUO Zhitao1, LIANG Qi1,2, TANG Hongtao1, CHEN Haisheng1. Analysis on joint adjusting of a two-stage centrifugal compressor with inter-stage cooling and variable guide vanes[J]. Energy Storage Science and Technology, 2017, 6(1): 108-115.

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