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The influence of low-solidity and slotting combined treatment method of diffuser vanes on performance of centrifugal compressor

  • Chao MaEmail author
  • Wenjiao Li
Technical Paper
  • 10 Downloads

Abstract

Centrifugal compressor with vane diffuser has high aerodynamic efficiency and narrow stable operating range, and study of extending its operating range has been a key and difficult point in the researching field of centrifugal compressor. In this paper, low-solidity treatment of diffuser vane is firstly adopted for a centrifugal compressor with vane diffuser, based on which slotting treatment at hub side of diffuser vane was further implemented, and then influence of this combined diffuser treatment method on the range of compressor stable operation is investigated. Results show that low-solidity treatment for diffuser vane can extend the compressor choking boundary in the full speed range and has no obvious improvement for the surge boundary; after further slotting treatment at hub side, both surge boundary and choking boundary of the compressor both increase obviously. With the increase in rotating speed, the extending effect of the stable operation range is more obvious, but this is also accompanied by an increase in aerodynamic loss. The combination treatment method of low solidity and slotting on vane hub side can be more than doubled in the stable operating range at high rotating speeds, and the effect is slightly worse at low and medium speed, compared to the vaneless diffuser treatment. Efficiency of vane diffuser compressor under low-solidity and slotting treatments can be higher than that of vaneless compressor through reasonable design of slots structure.

Keywords

Centrifugal compressor Vane diffuser Low solidity Slotting treatment 

List of symbols

c

Vane chord

D2

Diameter of impeller outlet

D3

Diameter of vaned diffuser inlet

D4

Diameter of vaned diffuser outlet

e

Vane pitch

fa

Axial thrust

h

Height of slots

H

Height of diffuser vane

k

Adiabatic exponent

m

Mass flow rate

mc

Mass flow rate of choke point

mi

Mass flow rate of inlet

mo

Mass flow rate of outlet

ms

Mass flow rate of surge point

N

Number of diffuser vane

n

Rotating speed

P01

Total pressure of compressor inlet

P02

Total pressure of compressor outlet

d1

Diameter of slots leading edge

d2

Diameter of slots trailing edge

t

Torque

T01

Total temperature of compressor inlet

T02

Total temperature of compressor outlet

Zb

Vane number

Greek letters

α1

Blade angle of impeller inlet at tip section

α2

Blade angle of vaned diffuser inlet

β1

Blade angle of impeller outlet

β2

Blade angle of vaned diffuser outlet

γ

Installation angle of diffuser vane

δ

Solidity of diffuser vane

η

Adiabatic efficiency

μ

Mass flow range

π

Total pressure ratio

Abbreviations

LE

Leading edge

LS

Low solidity

Ori

Original

OS

Open slots

PS

Pressure side

SS

Suction side

VL

Vane less

Notes

Acknowledgments

This research was funded by and the experimental testing was conducted by ATT Co. Ltd., which is gratefully acknowledged by the authors.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Marine Engineering CollegeDalian Maritime UniversityDalianChina
  2. 2.School of Mechanical EngineeringDalian Jiaotong UniversityDalianChina

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