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

Daiju Numata, Takaaki Tsuchiya, Keisuke Asai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
Publication statusPublished - 2013 Aug 19
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: 2013 Jan 72013 Jan 10

Publication series

Name51st 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
CountryUnited States
CityGrapevine, TX
Period13/1/713/1/10

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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    Numata, D., Tsuchiya, T., & Asai, K. (2013). Evaluation of free-stream turbulence intensity in the Mars Wind Tunnel under low Reynolds number conditions. In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 (51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013).