Abstract
In the present study the action of a turbulent gas flow on heat transfer to the wall and surface heating have been investigated theoretically and experimentally. In theory at the flow side a boundary layer model for determining analytically the heat flux into the surface is used. At the wall side an analytical solution of the heat conduction equation is given in order to calculate the wall heating. Solutions are found for the wall temperature distribution for both, noncoated walls as well as coated walls up to three coating layers. Experimentally the wall temperature distribution has been measured and is compared with the analytical solutions gathered from the heat conduction equation. Two flow problems have been investigated: (1) the heating of a gun tube wall between breech and projectile which is excerted to hot and compressed propellant gases, and (2) the heating of the nose cone of a sub-caliber, fin-guided projectile flying in a ram accelerator ai very high Mach numbers in a dense combustible gas mixture under pressures of 2 to 4 MPa.
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