In the present Paper, different wall heat flux evaluation methods for rocket engines are analyzed and compared. The test case for the comparison is a supercritical load point of an H 2 / O 2 upper-stage engine. The evaluation of the heat flux using existing gradient methods shows unacceptable deviations, whereas significant improvements are found with an inverse heat transfer method. Using a Nusselt number correlation for the modeling of the cooling channel heat transfer coefficient, good agreement with the experimental profiles is achieved, while the number of installed thermocouples is held at a minimum. However, the choice of the Nusselt number correlation directly influences the obtained results and strongly depends on the fuel and geometry of the system. Using a simultaneous optimization of the heat flux and heat transfer coefficient, on the other hand, seems to eliminate the need for additional modeling and leads to great agreement with the experiment. A new optimization method proposed in this Paper based on a preprocessed Jacobi matrix significantly speeds up the estimation of the free parameters. With the obtained results, the placement of the thermocouples before the design of the hardware can be optimized, leading to reduction of manufacturing costs.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Wall Heat Flux Evaluation in Regeneratively Cooled Rocket Thrust Chambers


    Contributors:

    Published in:

    Publication date :

    2021-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Coupled Heat Transfer Analysis in Regeneratively Cooled Thrust Chambers

    Betti, Barbara / Pizzarelli, Marco / Nasuti, Francesco | AIAA | 2014


    Localized overheating in Aerobee regeneratively cooled thrust chambers

    Bushnell, P. S., Jr. / Busse, J. R. | NTRS | 1966


    Coupled Heat Transfer Analysis in Regeneratively Cooled Thrust Chambers

    Betti, Barbara / Pizzarelli, Marco / Nasuti, Francesco | AIAA | 2012