Accession Number : AD0903666

Title :   Thrive - A Digital Computer Program for the Calculation of Thermionic Converter Performance Characteristics.

Descriptive Note : Final rept. Jan 71-Apr 72,

Corporate Author : GENERAL ELECTRIC CO PLEASANTON CA NUCLEAR THERMIONIC POWER OPERATION

Personal Author(s) : McCandless, R. J.

Report Date : AUG 1972

Pagination or Media Count : 87

Abstract : This report documents THRIVE - a digital computer program for computing thermionic converter performance characteristics. THRIVE computes converter output voltage, efficiency and plasma property profiles from the converter operating point specified by the electrode temperatures, cesium reservoir temperature, interelectrode spacing and current density. The computation is performed by numerically integrating a set of plasma transport differential equations which describe a low energy, three component, two temperature plasma in one dimensional planar geometry. The transport equations recognize variable electron current, electron temperature, electron kinetic energy flux, ion current, charged particle density and electrostatic potential in the quasineutral plasma. Volume ionization-recombination processes and collisional phenomena are represented. A set of boundary conditions is employed which recognizes the electrostatic sheaths adjacent to the electrodes and is consistent with the transport equations. Schottky effects at the electrode surfaces are accounted for. The electrode surfaces are characterized by field free cesiated work functions which may be derived from experimental data. The THRIVE program has been used to generate theoretical thermionic converter current-voltage characteristics that show excellent agreement with experimental data. (Author)

Descriptors :   (*COMPUTER PROGRAMS, THERMIONIC CONVERTERS), (*THERMIONIC CONVERTERS, PERFORMANCE(ENGINEERING)), PLASMA SHEATHS, ELECTRONS, VOLTAGE, EFFICIENCY, ELECTRODES, TEMPERATURE, ELECTROSTATICS, TRANSPORT PROPERTIES, DIFFERENTIAL EQUATIONS, EXPERIMENTAL DATA, COMPUTER PROGRAMMING, INPUT OUTPUT DEVICES, OPERATION.

Subject Categories : Electric Power Production and Distribution
      Computer Programming and Software
      Computer Hardware
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE