MATEC Web of Conferences (Jan 2018)

Research on Applicability of Hot-Bulb Anemometer under Low Pressure

  • Xiyuan Li,
  • Xiaofang Yin,
  • Yaqin Hou,
  • Qinghua Gao,
  • jing Wang

DOI
https://doi.org/10.1051/matecconf/201817903028
Journal volume & issue
Vol. 179
p. 03028

Abstract

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In Mars and other deep space exploration missions, the planetary atmosphere makes the difference in heat transfer characteristics on the planetary surface and on-orbit environment. In order to achieve the purposes of thermal model correction and spacecraft verification in extreme environment, Mars rover needs to be tested in a simulated Mars environment including low pressure, solar heat flux, wind speed and background temperature. Thus, wind speed should be measured at multiple points in the Mars rover thermal test. In a general Mars rover thermal balance test, the requirement for wind speed control and measurement is 0-15m/s under 700Pa pressure. The current anemometer for industrial use is mainly based on the dynamic pressure, heat or ultrasound. They have a small signal and need to be recalibrated at low pressures. In this paper, a constant heat flux hot-bulb anemometer model has been built using dimensionless number analysis method, with which the anemometer response under low pressure has been calculated. A series of calibration test has been employed to verify the model in space environment chamber. The two methods above reached a similar result, which demonstrates the effectiveness of the analysis.