Author Topic: Rocket Engine Q&A  (Read 257913 times)

Offline nicp

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Re: Rocket Engine Q&A
« Reply #760 on: 01/30/2018 07:50 AM »
I was wondering recently what kind of injector Raptor might have, and vaguely assumed it might be another pintle.
But then I remembered (I think this is right) that the fuel and oxidizer are both fully in the gaseous phase before hitting the main combustion chamber. This may also be true of BE-4.

As I recall one advantage of pintle injectors is you can get 'free' film cooling from fuel hitting the chamber walls. Which presumably is not going to happen with fully gaseous propellants.

But then (presumably) even a classic waterfall injector is going to have to be designed a little differently for gaseous propellants.

So what does a gaseous injector look like?
Where's my Guinness?

Tags: Injector Raptor BE-4