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Experimental investigations of an open-cycle vortex MHD generator.

Conroy-GJ; Kurtzrock-RC; Snedden-RB; Demeter-JJ; Hughes-WF
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 7699, 1972 Jan; :1-28
Electrical power generation was studied in a laboratory-scale, open- cycle vortex mhd generator, which offers several advantages over straight-channel generators that require separate combustors. Compactness, lower capital cost, and high-energy release are obtained by combining the combustor and generator into one unit in the vortex generator. In addition, the vortex generator uses a simple solenoid rather than the more complex and expensive saddle magnet required for straight-channel generators. Although the vortex generator must utilize combustion gases with a low hall coefficient in order to be efficient in direct comparison to the linear generator, the primary motivation was to investigate the vortex generator with applications to direct coal firing and with combustion taking place in specially designed expansion nozzles. One decided advantage is that slag deposits do not degrade or short- circuit the coaxial electrodes as is the case for a linear machine. The experimental vortex generator consists of a modified cyclone burner 7 1/2 in id by 21 in long, with the inner wall used as one electrode together with a coaxial center electrode. Power was obtained by impressing an axial field of 3,000 g from an air core solenoid magnet. Tests were conducted by seeding natural gas with potassium acetate and burning with preheated oxygen-enriched air. Power generation was lower than calculated because theoretical plasma velocities were not achieved.
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IH; Report of Investigations
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NIOSH Division
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Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 7699