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Wedge type vaned diffuser flow measurements in a low speed centrifugal compressor

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Title Wedge type vaned diffuser flow measurements in a low speed centrifugal compressor
 
Creator Temel, Ümit Nazll
Öztürk, Adnan
Pinarbasi, Ali
 
Subject Compressor
Diffuser flow
Vaned diffuser
 
Description 788-796
This study establishes effectiveness of vaned diffuser in comparison with vaneless diffusers in centrifugal compressor.
Hot wire measurements at three inter-vane positions for mean velocity, turbulent kinetic energy and flow angle distributions in
vaneless space and vane region of a low speed centrifugal compressor are presented. A low speed compressor with a 19 bladed
backswept impeller and 16-wedge vanes diffuser was used. The flow entering diffuser closely resembles classic jet-wake flow
characteristic of centrifugal impeller discharges. A strong upstream influence of diffuser vanes, which resulted in significant
variations in flow quantities between vane-to-vane locations, was observed. Circumferential variations due to passage and
blade wakes rapidly mixed out in vaneless space, although some variations were still discernible in vaned region. Impeller
blade wakes mixed out rapidly within vaneless space than in an equivalent vaneless diffuser. Although, flow is highly nonuniform
in velocity at impeller exit, there was no any separation from diffuser vanes. Presence of vanes accelerated mixing out
process. Therefore, use of twisted vanes in diffuser would be beneficial in reducing losses.
 
Date 2008-10-22T07:33:35Z
2008-10-22T07:33:35Z
2008-10
 
Type Article
 
Identifier 0022-4456
http://hdl.handle.net/123456789/2248
 
Language en_US
 
Publisher CSIR
 
Source JSIR Vol.67(10) [October 2008]