Ihi Corporation

Tsinghua University

Yangjun Zhang

Yun Zhi Lin

Hideaki Tamaki

Xinqian Zheng

Takahiro Bamba

Mingyang Yang

Chuanjie Lan

Weilin Zhuge

Tomoki Kawakubo

A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channeland a back-flow ring grooveto form a self-recirculating channel. An axial distance Sfrom an upstream end face of the suction ring grooveto an impeller full blade leading edgeor a width bof the suction ring grooveis represented as A&#xb7;sin(&#x3b1;+&#x3b8;)+Aand is distributed in a sinusoidal shape in a circumferential direction, an initial phase angle &#x3b8;is in a range of 0&#xb0;&#x2264;&#x3b8;&#x2264;360&#xb0;, and a circumferential angle &#x3b1; of the casinghas a definition range of &#x3b8;&#x2264;&#x3b1;&#x2264;&#x3b8;360&#xb0;. In the expression, A denotes amplitude of distribution of the axial distance Sor the width b, and Adenotes an average of the axial distance Sor the width b.

Centrifugal compressor having an asymmetric self-recirculating casing treatment

A centrifugal compressor has a casing. In the casingis formed a back-flow channelto return fluid from a downstream position of an impeller full blade leading edgeto an upstream position of the impeller full blade leading edge. The back-flow channelincludes a suction ring grooveand a back-flow ring groove. The suction ring groove opens at the downstream position on the inner faceof the casing, and extends in the circumferential direction. The back-flow ring groove opens at the upstream position on the inner face, and extends in the circumferential direction. Distribution in the circumferential direction of the axial-direction position of the suction ring grooveor a width of the suction ring grooveis asymmetric with reference to the rotation axis.

A centrifugal compressor includes: a volute casing including a first casing and a second casing that are mutually coupled, the first casing including a volute chamber therein and the second casing including an impeller installation space therein; an impeller provided in the impeller installation space so as to be rotatable around a rotation axis; and a vaneless diffuser that has an inlet that communicates with an inside of the second casing and has an outlet that communicates with an inside of the first casing. The vaneless diffuser has a width having a non-axisymmetric distribution in the circumferential direction.

Centrifugal compressor and manufacturing method therefor

A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channeland a back-flow ring grooveto form a self-recirculating channel. An axial-direction position Sfrom an upstream end face of the suction ring groove to an impeller full blade leading edgeor a width bof the suction ring grooveis represented as A(&#x3b1;&#xb7;D&#x2212;&#x3b2;&#xb7;D)+Aand is distributed in a parabolic shape in a circumferential direction. An initial phase angle &#x3b8;is in a range of 0&#x2266;&#x3b8;&#x2266;2&#x3c0;. A circumferential angle &#x3b1; of the casing has a definition range of &#x3b8;&#x2266;&#x3b1;&#x2266;&#x3b8;&#x3c0;. In the expression, A denotes a parameter of the parabola in the axial-direction position Sor the width b, and Adenotes an extreme of the axial-direction position Sor the width bwhen corresponding circumferential angle &#x3b2; and the &#x3b1; are equal at an extreme point of distribution of the parabola.

A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channeland a back-flow ring grooveto form a self-recirculating channel. A position or a width of the suction ring grooveis distributed in an arc shape in a circumferential direction, and the arc has a center angle &#x3b1; in a range of 0&#x3c;&#x3b1;&#x2266;30&#xb0;.

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Beijing, China

Yangjun Zhang