At the shock velocity range of 7∼9km/s, the variations of electron density behind strong shock waves are measured in a low-density shock tube by using the Langmuir electrostatic probe technique. The electron temperature, calculated based on Park’s three-temperature model, is used in interpreting the probe current data. The peak electron densities determined in the present experiment are shown to be approximately half lower than those predicted by Lin’s calculation. The experimentally obtained ratios of the characteristic ionization distance to the mean free path of freestream ahead of the shock wave are found to be in a good agreement with the existing experiments and Park’s calculation.
Shock Wave Shock Tube Electron Number Density Langmuir Probe Shock Velocity
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