The investigation of the relative impact of convective and radiative heat flux from vitiated gases to a combustor wall was performed in a backward-facing step combustor. Backward-facing step flows have many flow features of gas turbine combustors (recirculation, impingement, and boundary-layer development), but in a two-dimensional, nonproprietary geometry. Reynolds number, gas temperature, and plate temperature were varied as heat flux was measured in different regions of the flow. Measurements were made using a heat flux sensor and radiometer, which measure total and radiative heat flux, respectively. The highest total heat flux was measured at the impingement location and the lowest in the recirculation zone. Separating the total heat flux into the radiative and convective components is not straightforward and requires simulations of the experiment. Spectrally resolved Monte Carlo ray-tracing simulations are used to scale the radiative heat flux measurements for the separation of convective and radiative heat flux from the total heat flux measurements. These calculations show that only about 30% of incident radiation is captured by the radiometer due to spectral differences between the two sensors. Once the radiation measurement is corrected, experimental results show higher radiative than convective heat transfer at low Reynolds numbers ( R e h = 2000 ), highlighting the impact of radiative heat transfer in hot gas environments.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Interpreting Heat Flux Measurements in a Vitiated Backward-Facing Step Flow


    Contributors:

    Published in:

    Publication date :

    2024-04-26


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Measurement of Heat Flux in Reacting Flow in a Backward-Facing Step Combustor

    Colborn, Jennifer G. / O'Connor, Jacqueline A. | AIAA | 2024


    Benchmark backward facing step with heat transfer

    Darbandi, M. / Schneider, G. | AIAA | 1999


    Transonic flow past a backward-facing step

    CHOW, W. L. / SHIH, T. S. | AIAA | 1977


    Passive Flow Control on Backward Facing Step

    Findanis, Nicholas | AIAA | 2018


    Flapping Oscillations in Backward Facing Step Flow

    Ananda, B. K. / Gupta, A. K. / Oberai, M. M. | British Library Conference Proceedings | 1995