Computer modeling of space charge flow in an electrogasdynamic generator
Bohley, Carl Martin
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In an electrogasdynamic (EGD) generator the flow of a neutral medium carrying unipolar electrical charges constitutes an electrical current. A model of the charge flow in an EGD generator was constructed for use in a computer program. The program is designed to solve Poisson's and Laplace's equations for both axi symmetric and two-dimensional geometries. Schlieren photographs of the charge cloud were used to determine the charge cloud profile required by the program. Computer generated predictions agreed with three known solutions to Poisson's equation. Computer predictions of the effects of space charge flow modification were obtained. Space charge flow was modified both by increasing flow speed and by manipulating the space charge electric field. Experimentally, this was accomplished by increasing flow stagnation pressure and by application of 'a separate controllable electric field. Experimental results compare favorably with computer predictions. Some measurements were also made of the mobility range of the charged particles.
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