Good point - I haven't done a thermal analysis of it yet. I'll have to look at
the Bartz equation to see if it applies to this case, a direct or angled
impingement instead of a parallel wall combustion chamber. But an angled plate
would be a similar environment to the converging portion of a nozzle. On the
plate the velocity will be much higher but the temperature should be much lower
than in the chamber.
-Bob
On Sep 12, 2016, at 12:05, Henry Spencer <hspencer@xxxxxxxxxxxxx> wrote:
On Mon, 12 Sep 2016, Robert Watzlavick wrote:
...Or maybe an aluminum one with tubing welded on the back with water
running through it.
The main question would be how hot the surface would get. An impinging
rocket exhaust is the mother of all convective heat transfer systems, so even
with water right behind the surface, there'll be a serious temperature
gradient from front to back. You have to keep that low enough that the
surface layer doesn't melt, despite a thin and surely turbulent boundary
layer. Could be quite a challenge.
Henry
