Evaluation of free-stream turbulence intensity in the Mars Wind Tunnel under low Reynolds number conditions

Daiju Numata, Takaaki Tsuchiya, Keisuke Asai

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

It is known that the aerodynamic characteristics of low-Reynolds number airfoils be are susceptible to the free-stream turbulence in a wind tunnel. To control the turbulence intensity of the Mars Wind Tunnel (MWT) at Tohoku University, we built three types of turbulence grids and evaluated their effects on the flow fields at low pressure conditions. A hot-wire anemometer was used to measure velocity fluctuations in the test section for total pressures of 5, 11 and 22 kPa and the free-stream turbulence intensity was evaluated. The frequency analysis showed that the flow conditions were classified into four types depending on total pressure and flow velocity. The flow with no grid was almost laminar and the corresponding turbulence intensity was ranged from 0.5 up to 1.5 %. The effect of the turbulence grid was dependent on the grid type, particularly on a wire diameter. Using relatively thick wires, the turbulence intensity could be raised up to 3.0 %. The flow behind the grids was mostly turbulent except for some transitional conditions. These results indicated that, by using a properly-designed turbulence grid, we could produce relatively large free-stream fluctuations even at low Reynolds number condition.

本文言語English
ホスト出版物のタイトル51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
出版ステータスPublished - 2013 8月 19
イベント51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
継続期間: 2013 1月 72013 1月 10

出版物シリーズ

名前51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
国/地域United States
CityGrapevine, TX
Period13/1/713/1/10

ASJC Scopus subject areas

  • 宇宙惑星科学
  • 航空宇宙工学

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