Numerical simulation of geometric scale effects in cylindrical self-field MPD thrusters

Conference · Sat Aug 01 04:00:00 EDT 1992

OSTI ID:7042233

Lapointe, M

A 2-D, two-temperature, single fluid magnetohydrodynamic code which incorporates classical plasma transport coefficients and Hall effects was developed to predict steady-state, self-field magnetoplasmadynamic (MPD) thruster performance. The governing equations and numerical methods of solution are outlined and discussed. Experimental comparisons are used to validate model predictions. The model accurately predicts thrust and reproduces trends in the discharge voltage for discharge currents below experimentally measured onset values. However, because the model does not include electrode effects, the calculated voltage drops are significantly lower than experimentally measured values. Predictions of thrust and flow efficiency are made for a matrix of fifteen cylindrical thruster geometries, assuming a fully ionized argon propellant. A maximum predicted specific impulse of 1680 s is obtained for a thruster with an anode radius of 2.5 cm, a cathode radius of 0.5 cm, and equal electrode lengths of 2.5 cm. A scaling relation is developed to predict, within limits, the onset of cylindrical, self-field thruster instability as a function of geometry and operating condition.

• Research Organization: Sverdrup Technology, Inc., Brook Park, OH (United States)
• OSTI ID: 7042233
• Report Number(s): N-92-32239; NASA-CR--189224; E--7277; NAS--1.26:189224; CONF-920747--; CNN: NAS3-25266
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300102 -- MHD Generators-- Performance & Testing
33 ADVANCED PROPULSION SYSTEMS
330000* -- Advanced Propulsion Systems
CATHODES
COMPUTERIZED SIMULATION
DIRECT ENERGY CONVERTERS
ELECTRODES
FLUID MECHANICS
HALL EFFECT
HYDRODYNAMICS
ION THRUSTERS
MAGNETOHYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
MHD GENERATORS
PERFORMANCE
PLASMA
PROPULSION SYSTEMS
SIMULATION
THRUSTERS