Rotating instability in a centrifugal blower with shrouded impeller

C. K.P. Kowshik, Daisuke Tsugita, Yusuke Takeyama, Yutaka Ohta

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

Rotating instability in various types of fans, compressors, and pumps is considered as one of the symptoms of unsteady phenomena such as rotating stall or surge, and it is observed before a rotating stall as an amplitude increase in the power spectra of velocity fluctuation and/or radiated noise. In this paper, the cause of rotating instability in a centrifugal blower with a shrouded impeller is investigated through both experiments and numerical simulations. Experimental results show that the rotating instability may be attributed to unsteady vortices rotating along the impeller periphery and that a discrete noise component induced by the rotating instability is mainly caused by the interaction between unsteady vortices and the impeller discharge flow. A significant amplitude increase within a frequency band at almost half the blade passing frequency is found to be caused by an irregular change in the vortex rotating speed as well as by an irregular time interval in the train of generated vortices. In the numerical study, the structure and circumferential characteristics of the rotating vortices are investigated by a visualization technique using Qdefinition. Circumferential characteristics of the rotating vortices may be largely influenced by the steady characteristics of the impeller discharge flow field, which are determined by the geometric configuration of the impeller and the scroll casing.

本文言語English
ホスト出版物のタイトルASME Turbo Expo 2012
ホスト出版物のサブタイトルTurbine Technical Conference and Exposition, GT 2012
ページ685-694
ページ数10
DOI
出版ステータスPublished - 2012 12 1
イベントASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012 - Copenhagen, Denmark
継続期間: 2012 6 112012 6 15

出版物シリーズ

名前Proceedings of the ASME Turbo Expo
3

Conference

ConferenceASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012
国/地域Denmark
CityCopenhagen
Period12/6/1112/6/15

ASJC Scopus subject areas

  • 工学(全般)

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