Annular Liquid Propellant Jets - Injection, Atomization and Ignition.
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Research is directed at determining the hydrodynamics and ignition properties of HAN based liquid propellant LP annular sprays. The experimental fixture consists of an annular injector capable of injecting up to 4 cc of LP, in 3 to 20 msec, with velocities reaching 120 ms into a windowed chamber pressurized up to 15 MPa. Pressures and injection flow rate are recorded. High speed cinematography is used extensively. Two types experiments are conducted cold atomization and hot ignition. In the cold tests the LP and other liquids are injected into a room temperature argon gas. In the hot tests, LP is injected into the high pressure and temperature environment of steam and argon 22, 78 obtained from prior combustion of oxygen-hydrogen-argon mixture in the chamber. Atomization is promoted when injecting with higher velocities into denser gas. Injection along a protruding center bolt promotes jet divergence otherwise, jet convergence is observed. No particular standard atomization theory accounts for the observations.
- Liquid Rocket Propellants