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The pintle center body/tip is made out of copper, while the baseplate is made out of steel. The interruption in the manifold is so igniter/PT ports can connect to the chamber offset from the holes. As of now, this injector stiffness is still (barely) above 15% for 25% throttle. We haven't accounted for pressure loss in the regen channels yet, but since the fuel and oxidizer will be in separate tanks, the fuel pressure is not reliant on the ox pressure; we can increase the tank fuel pressure to account for the pressure loss in the channels.
Future things to considerQuestions that will guide design process that follows:
- Is a plate before the nitrous orifices necessary? I've seen it in a lot of designs
- What angle should the nitrous holes be at to get a good momentum ratio?
- What is the p-loss of having those holes in the middle of the manifold?
- Should the bottom of the baseplate that is interfacing with the CC gases be made thinner? I've heard that for injector face materials with low thermal conductivity like steel, you should regeneratively cool the face, which can only be done if that thickness is VERY low. But I am unsure about whether or not a material that thin can hold up to the pressure. Also, there is increased risk of gapping (microscopic bending of the baseplate into a slightly upside-down U shape) which could compromise a seal that is not shown.