Augmentation and Control of Burn Rates In Plasma Devices.
Summary rept. 1 Oct 95-30 Sep 96,
NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF NUCLEAR ENGINEERING
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Enhanced burn rates of JA-2 solid granular propellant through plasma ignition is evident. Burn rates increased by about a factor of 3 compared to conventional ignition, when plasma is injected normal to the surface of the propellant sample. Geometrical influence on JA-2 burn rates with plasma ignition showed increased burn rate with increased angle of injection. Time-averaged plasma temperatures of 0.8 to 1.2 eV and plasma densities of 2 x 10exp 23 to 4.5 x 10exp 23 m-3 have been deduced from relative intensities and stark broadening of copper lines. Erosive burn may be affected by formation of new surface areas governed by the initial level of plasma-propellant interaction. Increased neutral constituents at the plasma-propellant interface at larger injection angles may also be responsible for the observed decrease in line intensity. The vapor shield plasma at the flame temperature has a strong effect on radiative heating, the boundary layer becomes optically thick and absorbs a large fraction of the incoming energy. Plasma boundary layer temperature is less than that of the core plasma showing an energy transmission factor of less than 10 at large inclination angles, suggesting that plasma kinetic pressure has a stronger effect on the burn rate than the plasma radiative heat flux.
- Combustion and Ignition
- Electric and Ion Propulsion