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  • 1
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    End region effects upon the performance of a magnetohydrodynamic channel (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: (Previously cited in issue 06, p. 945, Accession no. A82-17889)
    Keywords: PLASMA PHYSICS
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    NASA TECHNICAL REPORTS
  • 2
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    Results and comparison of Hall and DW duct experiments (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experimental data from recent tests of a 45 deg diagonal wall duct are presented and compared with the results of a similar Hall duct. It is shown that while the peak power density of the two devices is approximately equal that the diagonal wall duct produces greater total power output due to its ability to better utilize the available magnetic field.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-82864 , DOE/NASA/10769-25 , E-1233 , NAS 1.15:82864
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    NASA TECHNICAL REPORTS
  • 3
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    Temperature distributions of a cesium-seeded hydrogen-oxygen supersonic free jet (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The hydrogen-oxygen plasma was generated at combustion chamber pressures ranging from 0.5 to 2.0 megapascals and for various seed ratios (1 to 10 percent). The plasma was observed as the atmospheric exhaust from a Mach 2 rocket test facility. Transverse profiles of the absolute integrated intensity were measured with the optically thin CsI lines (0.5664 and 0.5636 microns) at a range of axial positions downstream of the 5-cm-diameter combustor nozzle exit. Radial profiles of the emission coefficient were obtained from the measured transverse profiles of intensity by Abel inversion. Temperatures were then determined from the emission coefficients for conditions of local thermodynamic equilibrium using particle densities generated by a two-dimensional free jet computer program. Temperature results show the inherent effects of compression and expansion pressure waves characteristic of a free jet exiting from a supersonic nozzle.
    Keywords: PLASMA PHYSICS
    Type: NASA-TP-1162 , E-9267
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    End region and current consolidation effects upon the performance of an MHD channel for the ETF conceptual design (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of MHD channel end regions on the overall power generation were considered. The peak plant thermodynamic efficiency was found to be slightly lower than for the active region (41%). The channel operating point for the peak efficiency was shifted to the supersonic mode (Mach No., M sub c approx. 1.1) rather than the previous subsonic operation (M sub c approx. 0.9). The sensitivity of the channel performance to the B-field, diffuser recovery coefficient, channel load parameter, Mach number, and combustor pressure is also discussed. In addition, methods for operating the channel in a constant-current mode are investigated. This mode is highly desirable from the standpoint of simplifying the current and voltage consolidation for the inverter system. This simplification could result in significant savings in the cost of the equipment. The initial results indicate that this simplification is possible, even under a strict Hall field constraint, with resonable plant thermodynamic efficiency (40.5%).
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-82744 , DOE/NASA/10769-22 , E-1057 , Aerospace Sci. Conf.; Jan 11, 1982 - Jan 14, 1982; Orlando, FL; United States
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    NASA TECHNICAL REPORTS
  • 5
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    Results of duct area ratio changes in the NASA Lewis H2-O2 combustion MHD experiment (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: MHD power generation experiments utilizing a cesium-seeded H2-O2 working fluid have been carried out using a diverging area Hall duct having an entrance Mach number of 2. The experiments are conducted in a high-field strength cryomagnet facility at field strengths up to 5 tesla. The effects of power takeoff location, generator loading, B-field strength, and electrode breakdown voltage have been investigated. In this paper the effect of area ratio, multiple loading of the duct, and duct location within the magnetic field are considered.
    Keywords: PLASMA PHYSICS
    Type: AIAA PAPER 80-0023 , Aerospace Sciences Meeting; Jan 14, 1980 - Jan 16, 1980; Pasadena, CA
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  • 6
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    Experiments on H2-O2MHD power generation (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Magnetohydrodynamic power generation experiments utilizing a cesium-seeded H2-O2 working fluid were carried out using a diverging area Hall duct having an entrance Mach number of 2. The experiments were conducted in a high-field strength cryomagnet facility at field strengths up to 5 tesla. The effects of power takeoff location, axial duct location within the magnetic field, generator loading, B-field strength, and electrode breakdown voltage were investigated. For the operating conditions of these experiments, it is found that the power output increases with the square of the B-field and can be limited by choking of the channel or interelectrode voltage breakdown which occurs at Hall fields greater than 50 volts/insulator. Peak power densities of greater than 100 MW/cu M were achieved.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-81424 , World Hydrogen Energy Conf.; Jun 23, 1980 - Jun 26, 1980; Tokyo
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    NASA TECHNICAL REPORTS
  • 7
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    Effect of velocity overshoot on the performance of magnetohydrodynamic subsonic diffusers (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The evolution of an overshoot velocity distribution was studied in a plane two dimensional diffuser as a function of diffuser divergence angle. The diffuser performance for velocity overshoot was compared to that for a fully developed inlet velocity profile. Results indicate that the ratio of peak-to-center line velocity increases along the diffuser for a diffuser half angle greater than some critical value. It was also found that irrespective of the accompanying inlet temperature distribution, the wall shear stress and the wall heat flux is substantially larger when the inlet velocity profile has an overshoot than that for a fully developed inlet velocity profile.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-79305 , DOE/NASA/2674-79/8 , E-257 , Aerospace Sci. Meeting; Jan 14, 1980 - Jan 16, 1980; Pasadena, CA; United States
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  • 8
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    Spectroscopic determination of electrical conductivity in an MHD duct from absolute intensity measurements (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of the electrical conductivity in the NASA Lewis cesium seeded, H2-O2 MHD duct made by applying a voltage across the channel from one end electrode to the other, measuring the current, and using the inner electrodes as probes to monitor the voltage distribution along the channel were found to be in good agreement with theory except at low combustion pressures and/or high ratios of seed/oxygen mass flows. To corroborate these measurements and to analyze the possibility of nonuniform seed injection as a cause of the above deviations, a spectroscopic investigation of the plasma conductivity was undertaken. Radial profiles of emission coefficient were obtained from measured transverse profiles of the absolute integrated intensity by Abel inversion. Radial profiles of electrical conductivity were then obtained under two different assumptions. In the first the Cs seed fraction is assumed uniform and equal to the measured flow rate at the time when the temperature and conductivity were obtained. In the second method the local temperature and pressure are taken to be those given by a one-dimensional channel calculation including heat transfer and friction. The results of the two methods are compared to the previously measured conductivity.
    Keywords: PLASMA PHYSICS
    Type: Symposium on the Engineering Aspects of Magnetohydrodynamics; May 16, 1977 - May 18, 1977; Pittsburgh, PA
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    NASA TECHNICAL REPORTS
  • 9
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    Estimates of Optimal Operating Conditions for Hydrogen-Oxygen Cesium-Seeded Magnetohydrodynamic Power Generator (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The value of percent seed, oxygen to fuel ratio, combustion pressure, Mach number, and magnetic field strength which maximize either the electrical conductivity or power density at the entrance of an MHD power generator was obtained. The working fluid is the combustion product of H2 and O2 seeded with CsOH. The ideal theoretical segmented Faraday generator along with an empirical form found from correlating the data of many experimenters working with generators of different sizes, electrode configurations, and working fluids, are investigated. The conductivity and power densities optimize at a seed fraction of 3.5 mole percent and an oxygen to hydrogen weight ratio of 7.5. The optimum values of combustion pressure and Mach number depend on the operating magnetic field strength.
    Keywords: PLASMA PHYSICS
    Type: NASA-TN-D-8374 , E-8828
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    NASA TECHNICAL REPORTS
  • 10
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    Effect of vacuum exhaust pressure on the performance of MHD ducts at high B-field (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effect of area ratio variation on the performance of a supersonic Hall MHD duct is investigated. Results indicate that for a given combustion pressure there exists an area ratio below which the power generating region of the duct is shock free and the power output increases linearly with the square of the magnetic field. For area ratios greater than this, a shock forms in the power generating region which moves upstream with increasing magnetic field strength resulting in a less rapid raise in the power output. The shock can be moved downstream by either increasing the combustion pressure of decreasing the exhaust pressure. The influence of these effects upon duct performance is presented.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-82750 , DOE/NASA/10769-23 , E-1066 , Aerospace Sci. Meeting; Jan 11, 1982 - Jan 14, 1982; Orlando, FL; United States
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