|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Journal of Scientific and Industrial Research (JSIR) >
JSIR Vol.67 [2008] >
JSIR Vol.67(10) [October 2008] >
| Title: | Wedge type vaned diffuser flow measurements in a low speed centrifugal compressor |
| Authors: | Temel, Ümit Nazll
Öztürk, Adnan
Pinarbasi, Ali |
| Keywords: | Compressor
Diffuser flow
Vaned diffuser |
| Issue Date: | Oct-2008 |
| Publisher: | CSIR |
| Abstract: | 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. |
| Page(s): | 788-796 |
| ISSN: | 0022-4456 |
| Source: | JSIR Vol.67(10) [October 2008]
|
|
