| Citation: | CHEN Yingxiu, ZHENG Xinqian, HOU Anping. Effects of rotor eccentricity on the surge boundary of a centrifugal compressor[J]. Journal of Aerospace Power, 2023, 38（8）：2042-2048 doi: 10.13224/j.cnki.jasp.20210301
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The effects of rotor eccentricity on the centrifugal compressor surge were experimentally studied. Pulsation characteristics of the mild and deep surge were analyzed. And features of the surge boundaries were studied for different rotational speeds and rotor eccentricity cases. The results showed that due to the asymmetric volute, the pulsation amplitude of the mild surge had distinct circumferential difference, and both the magnitude and the phase of the difference varied with the rotational speed. However, the volute asymmetry had little effect on the circumferential difference of the pulsation amplitude of the deep surge. Compared with the non-eccentric case, the rotor eccentricity can increase the stable operating range of the mild surge by 4.24%. And the relative difference of the stable operating range for different eccentricity cases was up to 6.12%. When the minimum clearance caused by the rotor eccentricity was located at the circumferential position with large pulsation amplitude of mild surge, the mild surge can be suppressed and delayed, then the stable operating range was increased. Because there was almost no circumferential difference for the deep surge pulsation, the asymmetric coupling between the volute and the rotor eccentricity had little effect on the deep surge boundary. Compared with the non-eccentric case, the variation of the deep surge boundary was less than 1% under different rotor eccentricities.
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