Description
A pintle injector is a coaxial injector. Propellant stream A (fuel or oxidizer) flows through an outer tube, coming out as a cylindrical stream, while propellant stream B (complement of A) flows in an inner tube and impinges on a pintle shaped similarly to a car-engine poppet valve, which causes B to spray outward in a broad cone or flat sheet that intersects the cylindrical stream of propellant A. In some variants the pintle has grooves cut into it to produce radial jets in the flow of propellant B.
If propellant B is the fuel and A the oxidizer, the pintle arrangement can be set up to get fuel-film cooling of the inside of the combustion chamber essentially automatically; also, pintle injectors allow deep throttling without large losses in combustion efficiency. (Many people have experienced throttleable pintle sprayers in the form of standard garden hose-end sprayers.)
Read more about this topic: Pintle Injector
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