Specifications

investigations about a new-type grooved casing treatment configuration are presented for a
high-speed small-size centrifugal compressor. Different from traditional grooved casing
treatments, in which the grooves are always placed over the rotor (for both axial and radial
compressors), one or several circumferential casing grooves are placed along the shroud side of
the diffuser passage in this configuration, to enhance the stall margin of the compressor.
Computational fluid dynamics analysis is performed under stage environment in order to find the
optimum location of the circumferential casing groove for the subsequent experiments in
consideration of stall margin enhancement and peak efficiency gain, and the impact of groove
number to the effect of this new-type grooved casing treatment configuration in enhancing the
stall margin of the compressor stage is studied. It is found that stall margin gain due to the
existence of circumferential casing grooves arises from the suction-reinjection effect of the low
momentum fluid and its transportation along the circumferential and streamwise directions in
the grooves and the grooves located at the middle and rear part of the diffuser casing wall have
more pronounced effect in expanding the stall margin of the centrifugal compressor. In order to
verify the effectiveness of this new-type grooved casing treatment configuration, the solid casing
compressor and the compressors with circumferential casing grooves are tested in our test rig.
The results indicate that this new-type grooved casing treatment configuration can obtain
obvious improvement in the stall margin without sacrificing peak efficiency. Also, the numerical
investigation is conducted for the entire compressor with circumferential casing grooves and the
result is compared with the experimental data. © IMechE 2013.
Number of references: 27
Main heading: Centrifugal compressors
Controlled terms: Computational fluid dynamics
Uncontrolled terms: Casing treatment - Circumferential casing grooves - Computational
fluid dynamics analysis - Experimental investigations - Numerical investigations -
Radial compressors - Stage environments - Streamwise directions
Classification code: 618.1 Compressors - 921.6 Numerical Methods
DOI: 10.1177/0957650913477094
Database: Compendex
Compilation and indexing terms, © 2013 Elsevier Inc.
12.
Accession number: 20134016797463
Title: Identification of Hammerstein systems using key-term separation principle, auxiliary
model and improved particle swarm optimisation algorithm
Authors: Xu, Xiaoping1 ; Wang, Feng2 ; Liu, Guangjun1 ; Qian, Fucai3/徐小平;王峰;刘广钧;钱
富才
Author affiliation: 1 School of Sciences, Xi'an University of Technology, Xi'an 710054, China
2 School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an 710049, China
3 School of Automation and Information Engineering, Xi'an University of Technology, Xi'an
710048, China
Corresponding author: Wang, F. ([e-mail])
Source title: IET Signal Processing
Abbreviated source title: IET Signal Proc.