Embedded heat flux sensors fabricated using direct-write technology have been developed and tested within a direct-connect gaseous hydrocarbon-fueled scramjet combustor under Mach 5 flight conditions. The sensors employed a multilayer thermopile architecture fabricated via the additive direct-write thermal spray process, which enables their integration directly onto the components to be tested. The sensors were embedded within a 0.50-mm-thick (0.020-in.-thick) thermal barrier coating on test plugs that were inserted into the tunnel for testing. Fuel equivalence ratios and dynamic pressures were varied from φ = 0.6 to 1.0 and Q = 24 and 48 kPa (500 and 1000 psf), respectively, with increases in the global heat flux found to depend on the tunnel location. Heat flux values ranging from 30 to 75 W / cm 2 (26 to 66 Btu / ft 2 · s ) were measured downstream of the cavity flame holder, 20 to 150 W / cm 2 (18 to 132 Btu / ft 2 · s ) in the cavity flame holder, and 20 to 40 W / cm 2 (18 to 35 Btu / ft 2 · s ) upstream of the flame holder. Direct-write sensors reported heat flux trends that were consistent with separate area-averaged calorimetric measurements, and the local nature of the direct-write sensors enabled the detection of subtle transient phenomena not captured by calorimetry.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Heat Flux Measurements in a Scramjet Combustor Using Embedded Direct-Write Sensors



    Published in:

    Publication date :

    2015-03-24


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Heat Flux Measurements in a Scramjet Combustor Using Direct Write Technology

    Kennedy, Paul / Donbar, Jeffrey / Trelewicz, Jason et al. | AIAA | 2011


    Heat Flux Measurements in a Scramjet Combustor Using Direct Write Technology

    Kennedy, P. / Donbar, J. / Trelewicz, J. et al. | British Library Conference Proceedings | 2011


    Direct measurements of skin friction in a scramjet combustor

    SCHETZ, J. / VINOGRADOV, V. / MARSHAKOV., A. et al. | AIAA | 1993


    Direct measurements of skin friction in a scramjet combustor

    DETURRIS, D. / SCHETZ, J. / HELLBAUM, R. | AIAA | 1990


    Composite Scramjet Combustor

    Zander, Fabian / Morgan, Richard | AIAA | 2009