Accession Number : ADP000285

Title :   Molecular Beam Technique for Recording Chemical Species Behind Incident Shock Waves,

Corporate Author : STUTTGART UNIV (GERMANY F R) INST FUER THERMODYNAMIK DER LUFT- UND RAUMFAHRT

Personal Author(s) : Arndt,St. ; Frohn,A.

Report Date : JUL 1981

Pagination or Media Count : 7

Abstract : 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 M(s) = 6 to M(s) = 12. Experimental results are compared with intensities which are determined theoretically assuming a Maxwellian distribution function behind the incident shock.

Descriptors :   *Shock tubes, *Molecular beams, *Concentration(Chemistry), *Nitrogen, *Oxygen, Shock waves

Distribution Statement : APPROVED FOR PUBLIC RELEASE