Asymmmetry and unsteadiness of incipient separation of nominally axisymmetric turbulent boundary layer

Shigeaki Masuda, Kouhel Okada, Rei Takagi, Shinnosuke Obi

研究成果: Conference contribution

抄録

Unsteady and asymmetric behavior of separation of nominally axisymmetric and steady turbulent boundary layer in an axisymmetric expansion is investigated. The test diffusers have the total divergence angle from 8 to 50deg and length-to-diameter ratio of 8. Bulk Reynolds number is ranging between 2.5 × 104and 2.4 × 105. The wall static pressure fluctuation increases monotonically with increasing divergence angle up to 25° and then decreases. The wall static pressure exhibits large scale law frequency fluctuations, occurring almost concurrently in the entire passage. Distributions of both mean velocity and reverse flow fraction in a cross-stream plane show axial-asymmetry of the separated flow, suggesting the rapid growth of circumferential non-uniformity upstream. The velocity measurements employing a split film probe to distinguish the flow directions exhibits intermittent flow reversal with higher velocity as compared with forward flow. The conditional average of wall hot film signals reveals the steep decrease at the incipience of flow reversal.

本文言語English
ホスト出版物のタイトルProceedings of the 4th ASME/JSME Joint Fluids Engineering Conference
ホスト出版物のサブタイトルVolume 2, Part B, Symposia
編集者A. Ogut, Y. Tsuji, M. Kawahashi, A. Ogut, Y. Tsuji, M. Kawahashi
ページ1103-1108
ページ数6
出版ステータスPublished - 2003 12 1
イベント4th ASME/JSME Joint Fluids Engineering Conference - Honolulu, HI, United States
継続期間: 2003 7 62003 7 10

出版物シリーズ

名前Proceedings of the ASME/JSME Joint Fluids Engineering Conference
2 B

Other

Other4th ASME/JSME Joint Fluids Engineering Conference
国/地域United States
CityHonolulu, HI
Period03/7/603/7/10

ASJC Scopus subject areas

  • 機械工学
  • 流体および伝熱

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