Molecular Beam Technique for Recording Chemical Species Behind Incident Shock Waves,
STUTTGART UNIV (GERMANY F R) INST FUER THERMODYNAMIK DER LUFT- UND RAUMFAHRT
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It is the purpose of the present paper to develop a molecular beam technique for recording continuously the concentration of chemical species behind the incident shock wave in a shock tube. The sample is drawn through a diverging nozzle located at the end of the low pressure section of the shock tube. The inlet diamters of the nozzles are 1-4 mm. It is assumed that the expansion is so fast that freezing of chemical reactions occurs. With a skimmer a molecular beam is formed which is analyzed with a quadruopole mass filter. Preliminary experiments were performed with N2 and binary mixtures of N2 and O2 at initial pressures between 1 mbar and 10 mbar and at Mach numbers ranging from Ms 6 to Ms 12. Experimental results are compared with intensities which are determined theoretically assuming a Maxwellian distribution function behind the incident shock.