Vortical flow structure and loss generation process in a transonic centrifugal compressor impeller

Seiichi Ibaraki, Masato Furukawa, Kenichiro Iwakiri, Kazuya Takahashi

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

16 被引用数 (Scopus)

抄録

Transonic centrifugal compressors are used in turbochargers and turboshaft engines because of their small dimensions, relatively high efficiency and wide operating range. The flow field of the transonic centrifugal compressor impeller is highly three dimensional, and is complicated by shock waves, tip leakage vortices, secondary flows and the interactions among them. In order to improve the performance, it is indispensable to understand these complicated flow phenomena in the impeller. Although experimental and numerical research on transonic impeller flow has been reported, thus providing important flow physics, some undetected flow phenomena remain. The authors of the present report carried out detailed Navier-Stokes computations of a transonic impeller flow measured by Laser Doppler Velocimetry (LDV) in previous work. The highly complicated vortical flow structure and the mechanism of loss generation were revealed by a visual data mining technique, namely vortex identification based on the critical point theory and limiting streamline mapping by means of line integral convolution. As a result, it was found that the tip leakage vortices have a significant impact on the flow field and vortex breakdowns that increase the blockage of the flow passage, and that these were caused by shock wave interaction.

本文言語英語
ホスト出版物のタイトルProceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air
ページ1089-1098
ページ数10
6 PART B
DOI
出版ステータス出版済み - 2007
イベント2007 ASME Turbo Expo - Montreal, Que., カナダ
継続期間: 5 14 20075 17 2007

その他

その他2007 ASME Turbo Expo
Countryカナダ
CityMontreal, Que.
Period5/14/075/17/07

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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