| Popis: |
Few studies have yet considered the wall pressure and heat flux distribution over a flat plate assuming perfect gas to non-equilibrium flow conditions gas regarding the flight point, the attitude (angle of attack, side slip angle) and the size of the planar surfaces. One of them performed during 1950\'s by Hankey et al. suggested a very interesting analytical approach based on Eckert reference enthalpy to describe heat flux distribution over a flat plate. However, this formulation can only be applied under limited conditions. In this context, formulations proposed in open literature or internally at CNES and ONERA in Spacecraft-Oriented Codes for debris re-entry scenarios, such as PAMPERO and FAST/MUSIC respectively, have highlighted the disparity or the weak performance of Newtonian-like pressure and heat flux correlations computed so far. Therefore, new analytical models have been developed and successfully compared to CFD simulations as a better update to former models. These models based on a wide in-house CFD database (ONERA CEDRE Navier-Stokes multi-physics Platform) have been tested for various flow conditions according to the debris flight points trajectory including different gas flow assumptions for the shock layer physics (perfect gas, thermochemical equilibrium and non-equilibrium real gas), the attitude and the size (length, width, height) of the planar surfaces under the scope and of interest for debris flight physics. |
