| 摘要 |
<p>A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing 10, a suction ring groove 1, a ring guide channel 2 and a back-flow ring groove 3 to form a self-recirculating channel. An axial-direction position S r from an upstream end face of the suction ring groove to an impeller full blade leading edge 4 or a width b r of the suction ring groove 1 is represented as A (±·D-²·D) 2 +A 0 and is distributed in a parabolic shape in a circumferential direction. An initial phase angle ¸ 0 is in a range of 0‰¤¸ 0 ‰¤2À. A circumferential angle ± of the casing has a definition range of ¸ 0 ‰¤¸ 0 +2À. In the expression, A denotes a parameter of the parabola in the axial-direction position S r or the width b r , and A 0 denotes an extreme of the axial-direction position S r or the width b r when corresponding circumferential angle ² and the ± are equal at an extreme point of distribution of the parabola.</p> |
