Key Points and Specs
Purpose: Use for a vehicle to break collegiate world record for highest altitude liquid bi propellant engine
Propellant: Liquid Oxygen oxidizer and IPA based fuel.
Injector: Swirl
Burn Time: 10 seconds
Feed type: Pressure fed
Thrust: 750 lbf
ISP: 231* s
Cooling Method: composite and film
What I do
Semi-Infinite Plot from Combustion Chamber to Injector, no cooling considered
As RED and Saguaro have a shared injector, there are a lot of similar properties between both. I typically work on the injector system and expected heat transfer rates on it. This is done through making semi-infinite body calculations for the injector and breaking that into smaller bits as areas such as LOX and fuel cooling can be considered.
A big concern here is making sure that the injector face plate stays cool enough during combustion, especially for RED as the JetA fuel would already be in the 550-700 k range while the combustion chamber has temperatures of 2490 k.