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Mass-spectrometric analysis of hypersonic flows

K C A Crane and R J Stalker

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Quantitative mass-spectrometric measurements have been made of the relative species concentrations in non-equilibrium hypersonic flows produced in a shock tunnel. Some partially dissociated flows of either nitrogen, air, or carbon dioxide have been analysed at nominal stagnation enthalpies up to 60 MJ kg-1. Emphasis was placed on eliminating two basic problems which had not been resolved by previous workers. One involved the dependence of electron-impact ionization cross-sections of neutral molecules on their vibrational temperature. The other was to perform a calibration which fully accounted for the effects of separation of the neutral species in the molecular beam sampled from the flow. Experimental results are compared with approximate calculations.


PACS

47.40.Ki Supersonic and hypersonic flows

82.80.Ms Mass spectrometry (including SIMS, multiphoton ionization and resonance ionization mass spectrometry, MALDI)

47.70.Nd Nonequilibrium gas dynamics

47.40.Nm Shock wave interactions and shock effects

Subjects

Fluid dynamics

Chemical physics and physical chemistry

Dates

Issue 5 (1 April 1977)



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