Gas-Discharge Anemometer for the Investigation of Flow Dynamics in Rarefied Gas Media |
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Authors: | Evlanov E N Zubkov B V Nenarokov D F Linkin V M Zavjalov M A Tyuryukanov P M |
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Institution: | (1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 83/32, Moscow, 117810, Russia;(2) All-Russia Electrotechnical Institute, Krasnokazarmennaya ul. 12, Moscow, 111250, Russia |
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Abstract: | A gas-discharge anemometer is designed for investigating the gas-flow dynamics in wind tunnels, and in experimental and space meteorology. The anemometer allows one to measure simultaneously the magnitude and direction of the gas-flow velocity vector and the gas pressure in the flow. The instrument consists of a gas-discharge chamber, an analyzer of scattered ions, a power supply unit, and a measuring unit. The anemometer weight does not exceed 0.1 kg, and the power consumption does not exceed 0.2 W. The instrument was put through preliminary tests in a wind tunnel that simulated, in particular, the conditions in the boundary layer of the Martian atmosphere and produced a directed gas (air or CO2) flow whose velocity could be varied from 0.5 to 50 m/s at pressures from 0.3 to 1.3 kPa and temperatures from –120 to +20°C. The anemometer sensitivity is no worse than 100 mV/(m/s). The method of calculating the gas-flow velocity on the basis of the measured ion-current distributions is developed. |
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