US 12,297,847 B1
Noise-reducing and nonuniform tip clearance structure of centrifugal compressor
Yipeng Cao, Harbin (CN); Shaoran Du, Harbin (CN); Chen Liu, Harbin (CN); Yao Song, Harbin (CN); Jie Yang, Harbin (CN); Xiaochen Zhao, Harbin (CN); Jie Guo, Harbin (CN); and Xinyu Zhang, Harbin (CN)
Assigned to Harbin Engineering University, Harbin (CN)
Filed by Harbin Engineering University, Harbin (CN)
Filed on Nov. 8, 2024, as Appl. No. 18/942,128.
Claims priority of application No. 202410564485.0 (CN), filed on May 9, 2024.
Int. Cl. F04D 29/66 (2006.01); F04D 17/10 (2006.01); F04D 29/28 (2006.01)
CPC F04D 29/666 (2013.01) [F04D 17/10 (2013.01); F04D 29/284 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A noise-reducing and nonuniform tip clearance structure of centrifugal compressor, comprising a compressor impeller body and a compressor impeller shroud, wherein the compressor impeller shroud is circumferentially wrapped outside the compressor impeller body, and a plurality of impeller blade bodies are uniformly arranged in a circumferential direction of the compressor impeller body; and a clearance between an impeller tip meridian line of the impeller blade body and an impeller shroud meridian line on the compressor impeller shroud is an impeller tip clearance;
wherein the impeller tip clearance gradually decreases in a direction from a leading edge to a trailing edge of the impeller blade body, and a change rate of the impeller tip clearance in the direction from the leading edge to the trailing edge of the impeller blade body also gradually decreases;
wherein the plurality of impeller blade bodies comprise a plurality of main blade bodies and a plurality of splitter blade bodies, and the plurality of main blade bodies and the plurality of splitter blade bodies are distributed in a staggered manner;
wherein the impeller tip clearance satisfies a formula C=(1+H4)T;
wherein C is a dimensionless tip clearance height,

OG Complex Work Unit Math
or

OG Complex Work Unit Math
X is a height of the impeller tip clearance at any normal position of a main blade meridian line, and Y is a height of the impeller tip clearance at any normal position of a splitter blade meridian line; H is a dimensionless blade height coefficient,

OG Complex Work Unit Math
and H∈[0,1], 0 and 1 denote a blade trailing edge and a blade leading edge, respectively; h is a blade height at any normal position between blade meridian lines, HL is a height of a leading-edge blade, and HT is a height of a trailing-edge blade; and T is a ratio of a trailing-edge tip clearance to a leading-edge tip clearance,

OG Complex Work Unit Math
XL is a leading-edge tip clearance of a main blade, XT is a trailing-edge tip clearance of the main blade, YL is a leading-edge tip clearance of a splitter blade, and YT is a trailing-edge tip clearance of the splitter blade.