Nonequilibrium Supersonic Magnetogasdynamic Wind Tunnel
Final rept. 1 Jan 2005-31 Dec 2007
OHIO STATE UNIV COLUMBUS DEPT OF MECHANICAL ENGINEERING
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The report presents results of cold MHD flow deceleration experiments using repetitively pulsed, short pulse duration, high voltage discharge to produce ionization in M3-4 nitrogen and air flows in the presence of transverse DC electric field and transverse magnetic field. MHD effect on the flow is detected from the flow static pressure measurements. Retarding Lorentz force applied to the flow produces a static pressure increase of up to 20, while accelerating force of the same magnitude results in static pressure increase of up to 10. The measured static pressure changes are compared with modeling calculations using quasi-one-dimensional MHD flow equations and with predictions of a 3-D Navier-Stokes MHD flow code, showing good agreement. Comparison of the experimental results with the modeling calculations shows that the retarding Lorentz force increases the static pressure rise produced by Joule heating of the flow, while the accelerating Lorentz force reduces the pressure rise. The effect is produced for two possible combinations of the magnetic field and transverse current directions producing the same Lorentz force direction both for accelerating and retarding force.
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics