At 05:13 PM 6/10/2004 -0700, you wrote:
>We are considering an alternate nozzle strategy: lots of little 1" throat >nozzles welded between two water jet cut plates.
Why welded between two plates? Run coolant through it?
So it becomes a honeycomb structure, otherwise you would need a very thick top plate.
I looked a lot at making a lot of little nozzles out of a single plate either cast or machined with micronozzles across the plate. Cast inconel plates with the nozzles preformed aren't that expensive, and can operate at the required temps for many of the propellants. Probably including your mixed monoprop. Stainless is probably even good enough for that mixture.
Stainless is fine for our mixed-monoprop, but even inconel doesn't really get you up into any bipropellant temperature ranges. The "superalloys" don't have much higher melting points than stainless, they just retain a lot more strength at the elevated temperatures. None of them have any usability above about 2200 F. You need to go to a refractory (columbium, molybdenum, etc) to get an uncooled biprop, and even then you need to run very low pressure.
John Carmack
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