Pulse detonation MHD experiments
In: 29th AIAA, Plasmadynamics and Lasers Conference, 1998-06-15
Online
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Zugriff:
A series of laboratory experiments were conducted to investigate the basic engineering performance characteristics of a pulse detonation driven magnetohydrodynamic (MHD) electric power generator. In these experiments stoichiometric oxy-acetylene mixtures were seeded with a cesiumhydroxide/methanol spray and detonated at atmospheric pressure in a 1 m long tube having an inside diameter of 2.54 cm. Experiments with an axisymmetric plasma diagnostic channel attached to the end of the tube confirmed the attainment of detonation conditions (p2/pi - 34 and D - 2400 m/s) and enabled the measurement of current density (- 2 A/cm2) and electrical conductivity (- 6 mho/m) behind the detonation wave front. In a second set of experiments, a 30 cm long continuous-electrode Faraday channel having a height of 2.54 cm and a width of 2.0 cm was attached to the end of the tube using an area transition duct. The Faraday channel was placed inside a permanent magnet assembly having a nominal magnetic induction of 0.6 Tesla, and the electrodes were connected to an active loading circuit in order to characterize power extraction dependence on load impedance while also simulating higher effective magnetic induction. In these single-shot experiments, the nearelectrode potential drop was found to consume approximately 60% of the effective uxB induced potential. The experiments indicated peak power extraction at a load impedance between 5 and 10 Ohms. The measured peak electrical energy density ranged from 10 to 103 J/m3 when the effective magnetic induction was varied from 0.6 to 4.2 Tesla. These results were in reasonable agreement with a simple electrodynamic model incorporating a correction for near-electrode potential losses. By scaling-up to a practical size device, limiting the near-electrode potential drop to 10% of the induced potential, and optimizing seed atomization characteristics, we anticipate a five to ten fold increase in attainable electrical energy density.
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Pulse detonation MHD experiments
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Autor/in / Beteiligte Person: | Incorporated, Erc ; Litchford, Ron J. ; Thompson, Bryan R. ; Lineberry, John |
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Zeitschrift: | 29th AIAA, Plasmadynamics and Lasers Conference, 1998-06-15 |
Veröffentlichung: | American Institute of Aeronautics and Astronautics, 1998 |
Medientyp: | unknown |
DOI: | 10.2514/6.1998-2918 |
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