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4bc16de163 The temperatures at which linear coal-fueled MHD generators can operate are limited by factors that include: (a) the combustion fuel, oxidizer, and oxidizer preheat temperature which limit the maximum temperature of the cycle; (b) the ability to protect the sidewalls and electrodes from melting; (c) the ability to protect the electrodes from electrochemical attack from the hot slag coating the walls combined with the high current or arcs that impinge on the electrodes as they carry off the direct current from the plasma; and (d) by the capability of the electrical insulators between each electrode. John W. The aim was an enthalpy extraction of 30% and an MHD thermal efficiency of 60%. development. where. where . The optimal magnetic field on duct-shaped MHD generators is a sort of saddle shape. The current flowing across the plasma between these electrodes is called the Faraday current.
Each other electrode is shorted to an electrode on the opposite side of the duct. The basic MHD design was to be a system with inert gases using a disk generator. These plants would recover MHD exhaust heat for oxidant preheat, and for combined cycle steam generation. "I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to the earth." President John F. Note that 90% conductivity can be achieved with a fairly low degree of ionisation of only about 1%. In a speech given before a joint session of Congress on May 25, 1961 . Gardner. In the 1980s, the U.S. Dutch physicist Antoon Lorentz provided the mathematical theory to quantify its effects.