A 150 kw electron beam heated radiatively driven wind tunnel experiment
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abstract
Controlledenergy addition to a supersonic flow using a 700 keV electron beam has been demonstrated at currents up to 300 mA and for durations up to 3.2 ms. Measurements of electron beam diameter and current were used to characterize beam transport through the steering magnets and nozzle. These measurements demonstrate that good magnetic control of electron beam transport has been attained, allowing propagation through the nozzle with less than 0.5 % of power input into the nozzle being deposited on the nozzle walls. The good agreement between these measurements and modeling allowed an estimation of power deposition in the flow during blow down conditions. Time resolved shadowgraph images and measurements of static pressure along the nozzle during this heating period show that stable, steady flow is achieved within 900 s of beam turn on, and that steady flow is maintained for the remainder of the heating period. Preliminary results of flow temperature, density and chemistry are presented and further improvements to these measurements in continuing experiments are discussed. 2000 by Princeton University, Inc. All rights reserved.
