Shin, YH Kim, KH 2024-01-21T09:32:28Z 2024-01-21T09:32:28Z 2021-09-01 2003-02 1340-8054 https://pubs.kist.re.kr/handle/201004/138888 This study presents the unsteady fluctuation measurements of impeller discharge flow for a centrifugal compressor in unstable operating region. The characteristics of the blade-to-blade flow under rotating stall were investigated by measuring unsteady velocity fluctuations at several different diffuser axial distances using a hot wire anemometer and high frequency pressure transducers mounted on the shroud wall. The flow characteristics in terms of the radial and tangential velocity components and turbulence intensity at the impeller exit were analyzed by using double phase-locked ensemble averaging techniques. During one stall period, a deep wake core was observed on the suction surface near the hub for the maximum radial velocity instant. On the other hand, large wake region existed in the middle of the passage near the shroud side. For the radial velocity increasing instant a quite strong core flow was generated at the pressure side,,however, for the decreasing instant comparatively strong core flow was developed near the suction side. English JAPAN SOC MECHANICAL ENGINEERS VANELESS DIFFUSER Blade-to-blade flow at centrifugal impeller exit under rotating stall Article 10.1299/jsmeb.46.154 1 JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING, v.46, no.1, pp.154 - 162 JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING 46 1 154 162 scie scopus 000181879800022 2-s2.0-0041690970 Thermodynamics Engineering, Mechanical Thermodynamics Engineering Article VANELESS DIFFUSER centrifugal compressor rotating stall blade-to-blade flow turbulence intensity double phase-locked ensemble averaging technique