Exhaust of NO_x from High-Temperature Wind Tunnels

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概要

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• Theoretical calculations were performed in order to estimate the concentrations of three main constituents of NO_x (NO, NO_2 and N_2O) in the exhaust gas produced by two kinds of hypersonic wind tunnels. One of them had an arc-heater, and the other a pebble-heater. Estimations were performed for the equilibrium air in the plenum chamber, for the equilibrium and nonequilibrium nozzle flows, and for the final exhaust gas. Measurements in the exhaust gas of the arc-heated wind tunnel show that the total concentration of NO_x (NO and NO_2) was of the order of 10,000 ppm, depending on the conditions of operation. Two simple models are proposed to explain the origin of such a high level of NO_x in the exhaust. It is shown that a model taking account of the isothermal compression of the exhaust gas in rotary pumps of the vacuum system can predict the formation of high concentrations of NO_x.

• 社団法人応用物理学会の論文
• 1987-11-20

著者

• Matsuzaki R

  National Aerospace Laboratory

関連論文

• Exhaust of NO_x from High-Temperature Wind Tunnels
• Effect of Coupling between Free Electron and Molecular Rotation on Electron Temperature in Ionized Nonequilibrium Flow of Air

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