Theoretical calculations were performed in order to estimate the concentrations of three main constituents of NOx (NO, NO2 and N2O) 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 NOx (NO and NO2) was of the order of 10000 p.p.m., depending on the conditions of operation. Two simple models are proposed to explain the origin of such a high level of NOx 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 NOx.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Exhaust of NOx from high-temperature wind tunnels


    Additional title:

    NO(x)-Abgase aus einem Hochtemperaturwindkanal


    Contributors:

    Published in:

    Publication date :

    1987


    Size :

    6 Seiten



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Exhaust of NOx from high-temperature wind tunnels

    MATSUZAKI, R. / HIRABAYASHI, N. | AIAA | 1985


    High velocity wind tunnels

    Huguenard, E. | Engineering Index Backfile | 1925


    High-speed wind tunnels

    Ackeret, J. | Engineering Index Backfile | 1936


    Wind tunnels

    Jaffe, P. / Klose, C. / Walker, B. et al. | NTRS | 1965


    Triple wind tunnels for temperature extremes

    Fiat,IT | Automotive engineering | 1977