Microwave resonant cavities operated in the TM sub 010 mode and constituting a part of the driven section of a pressure driven shock tube are used in the investigation. With argon as the driven gas (at a density of approximately 0.001 to 0.02 atmospheres) and hydrogen as the driver gas, the shock Mach number is varied over a range between 10 and 13.5. With the cavities operated in the S-Band ...
The measurement of ionization rate, electron density and ionization relaxation time in thermally ionized gases, by means of a microwave technique is discussed. The technique used in this work utilizes a so-called end wall microwave resonant cavity. It is essentially a microwave cavity operated in the TE011 mode with a plasma forming one end wall. Since the resonant frequency of such a cavity is a function of the axial length ...
A hypersonic shock tunnel has been designed and constructed for obtaining fluid dynamic and electromagnetic properties of the flow field around hypersonic reentry bodies. In this report the design philosophy and a description of the combustion driven shock tunnel of the Polytechnic Institute of Brooklyn is presented as well as the estimated performance of the shock tunnel over a range of test section stagnation conditions. (Author)
Several microwave techniques for the measurement of aerodynamic and electromagnetic properties of the flow fields in shock tubes are presented. In particular, microwave techniques applicable to the measurement of shock velocity, running time and electron density are discussed. By using the driven section of the shock tube as a wave guide which is excited by a single microwave antenna, simultaneous measurements of shock velocity attenuation and running time are obtained. ...
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