원심압축기의 링 그루브 효과에 관한 수치해석적 연구

Abstract

This paper presents the numerical study of casing treatments on a centrifugal compressor stage for improving stability and enhancing surge margin. A high efficiency, a high pressure ratio and a wide operating range are required for a high performance centrifugal compressor. In the present study, the ring groove arrangement was applied to the transonic centrifugal compressor. According to the numerical analysis by using a commerical code ANSYS-CFX, the unstable phenomena limiting the range of the centrifugal compressors were compared with and without ring groove. Although ring groove decrease the efficiency, but increase the operating range by suppressing the separation at the leading-edge of the impeller especially near shroud part. Newly designed ring groove arrangement improved the compressor performance and increased the operating range of the compressor.