Thanks all for the help!
I was also planning on just doing it in combination with regen. Shapeways
has a new print service for 316 stainless that looked quite interesting.
Was thinking I could leverage a bit of film cooling to help some of the
hotspots out. Wanted a bit more data on what to do ahead of time than
"Point some orifices at the wall and hope for the best".
-Wyatt
On Sat, Oct 3, 2020 at 2:30 PM Henry Spencer <hspencer@xxxxxxxxxxxxx> wrote:
On Sat, 3 Oct 2020, Wyatt Rehder wrote:
Does anyone have any reasonable papers/resources on just standard film
cooling? I have been having a hard time finding any resources on the
subject beyond stuff like the basic blurb in Design of LPREs.
NASA SP-8124, "Liquid rocket engine self-cooled combustion chambers",
talks about it. Ditto SP-8081, "Liquid propellant gas generators" -- gas
generators for big engines are often closer in size to amateur-scale
engines.
I don't know of a real design guide on it, perhaps because it's usually
been treated as a supplement to regen or ablative cooling.
The Viking engine used in the first stages of Arianes 1 through 4 was
film-cooled, but I don't think I've ever seen a detailed technical
description. It was an N2O4/UDMH engine, and they tend to run a bit
cooler than LOX-based designs, which probably helped. There are probably
some papers on it in old conference proceedings and the like, but they
would almost certainly be in French...
Henry