Direct numerical simulation of global instability in a hole-tone feedback system

Kazuo Matsuura, Masami Nakano

研究成果: Conference contribution

抄録

Direct computations and experiments of a hole-tone feedback system are conducted. The mean velocities of an airjet are 8 and 10 m/s in the computations, 6-13 m/s in the experiments. The diameters of a nozzle and an end plate hole are both 50 mm, and an impingement length between the nozzle and the end plate is 50 mm. The computational results agree well with the experimental data in terms of qualitative vortical structures and a relationship between the most dominant holetone frequency and a jet speed. Based on the computational results of the air-jet speed of 8 m/s, a Proper Orthogonal Decomposition (POD) analysis of the whole pressure fluctuation field is conducted. The 1 st and 2nd POD modes are nearly in anti-phase, and alternatively appearing helical structures are observed upstream of the end plate hole in an isosurface plot of the eigenfunctions of the modes. Dominant behaviors of vortex shedding from the end plate hole are represented by the 3rd and 4th modes. As the result, dominant variation of the pressure fluctuation field is successfully extracted by the present POD analysis.

本文言語English
ホスト出版物のタイトルASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011
ページ2249-2254
ページ数6
PARTS A, B, C, D
DOI
出版ステータスPublished - 2011 12 1
イベントASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011 - Hamamatsu, Japan
継続期間: 2011 7 242011 7 29

出版物シリーズ

名前ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011
番号PARTS A, B, C, D
1

Other

OtherASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011
国/地域Japan
CityHamamatsu
Period11/7/2411/7/29

ASJC Scopus subject areas

  • 流体および伝熱

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