Accession Number : ADA260645


Title :   Studies of Several Small Seawater MHD Thrusters Using the High-Field Solenoid of MIT's Bitter Magnet Laboratory


Descriptive Note : Annual rept. 1 Feb 1992-31 Jan 1993


Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB


Personal Author(s) : Lin, T F ; Aumiller, D L ; Gilbert, J B ; Coslo, M J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260645.pdf


Report Date : Feb 1993


Pagination or Media Count : 100


Abstract : The performance of several small, seawater magnetohydrodynamic (MHD) thrusters was studied in a closed loop environment. Three different thrusters were designed, constructed, and evaluated. For the first time, videographic and photographic recordings of flow through an MHD thrusters were obtained. The MHD induced flowrate, thrust, and mechanical efficiency was measured/calculated for each thruster at different combinations of electric current and magnetic field strength. Direct determination of thrust, and subsequently of efficiency were not possible. Therefore, the hydraulic resistance of each different thruster was correlated with flowrate. This information was used in conjunction with the measured MHD induced flowrate to calculate the thrust and efficiency of each thruster. Experimental results were repeatable. A theoretical model was developed to predict the performance of each thruster. The results of this model are presented for one thruster at several magnetic field strengths at various electric currents. These predictions corresponded well with the measured/ calculated values of MHD induced flowrate and mechanical efficiency. Finally, several MHD thrusters with radically different configurations are proposed.


Descriptors :   *ELECTRICAL CONDUCTIVITY , *SEA WATER , *THRUSTERS , *MAGNETOHYDRODYNAMICS , COMPUTER PROGRAMS , MAGNETIC FIELDS , MODELS , FLOW RATE , SALINITY , SOLENOIDS , CYCLOTRONS , SUPERCONDUCTIVITY , ION EXCHANGE , MAGNETS , LOOPS , HYDRAULICS , ELECTRIC CURRENT , RESISTANCE , EFFICIENCY , VOLTAGE


Subject Categories : Plasma Physics and Magnetohydrodynamics
      Jet and Gas Turbine Engines
      Rocket Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE