Abstract
In the DLR-high vacuum plume test facility STG, experiments have been performed to study the expansion of supersonic plumes into vacuum with N_2 as a test gas. So far, the molecule number flux, the rotational temperature and the density were measured by the 2+2 REMPI technique with a stimulation wavelength of 283-284mm. This method is also suitable to measure the absolute flow velocity by the ion-time-of-flight (ion-TOF) method. This study is focused on the experimental methods of measure the flow velocity of rarefied plumes. The results of measurements in highly rarefied plumes taken on-axis for several stagnation temperatures are presented, and the measured angular velocity profiles (off-axis) are discussed and compared to the theory. The effect of the suction voltage on the flow velocity measurement by the ion-TOF method is also clarified.
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