[AR] Re: Cold tests this weekend
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Mon, 12 Sep 2016 13:05:04 -0400 (EDT)
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
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