Conjugate heat transfer studies are presented for high speed aerospace vehicles using a commercial CFD software. Navier Stokes equations in the fluid domain and transient heat conduction equations in the solid domain are solved simultaneously to obtain the skin temperature history. The energy balance at the gas-solid and solid-solid interface is done by matching both temperature and heat flux at the interface. Computational methodology is first validated by comparing against experimental results of laminar flow past axisymmetric double cone at Mach 4.57 and turbulent flow over circular cylinder at Mach 6.47. Grid independence of the simulation is demonstrated by comparing the results with two different grids and comparing the results. For laminar test case of Mach 4.57 flow over double cone, the simulation crisply captured the bow shock, the separation shock, reattachment shock, the separated flow region and type V shock-boundary layer interaction is observed. Computed flow field, surface temperature distribution and surface temperature history match nicely with experimental as well as other numerical results reported in the literature. Temperature dependent material properties are found to have significant effect on the surface temperature prediction. For turbulent test case for Mach 6.47 flow over circular cylinder, the computed surface pressure, cold wall heat flux, and surface temperature compare well with experimental results and other numerical results available in the literature. The validated methodology was then applied to predict the surface temperature of a high speed aerospace vehicle and the computed skin temperature is compared with flight measured values. Although, a good overall match is observed, computed skin temperature is lower than the flight measured values in the time between 100 s and 200 s and slightly more than the flight measurement afterwards. It has been observed that near the dissimilar metal junction regions two dimensional heat conduction is predominant.


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    Title :

    Conjugate heat transfer analysis in high speed flows


    Additional title:

    Analyse der Wärmeübertragung in Hochgeschwindigkeitsströmungen


    Contributors:


    Publication date :

    2013


    Size :

    10 Seiten, 16 Bilder, 30 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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