Injector Demos
These demos are available for your enjoyment as you learn about rocket engines. To use them you’ll need a pump with at least 40psi and a gallon or so per minute of flow. I used a portable car wash pump from Amazon. This work is licensed:
Liquid Engine Demo by Charlie Garcia is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Impinging Injector
Impinging injectors are a common, straightforward injector geometry that works particularly well for engines which are injecting liquid propellants with similar mass flows and densities.
Pintile Injector
The pintile injector was first used to develop a deeply throttleable engine for the Apollo lunar lander. More recently this injector has found fame at the head of SpaceX’s Merlin rocket engines which propulsively land the Falcon 9 rocket.
Co-Axial Injector
This injector is specifically a swirler co-axial injector. The propellants swirl in and fan out. This geometry is not only useful for liquid injection, but has also found use for engines with pre-burners and expander cycles.