Download or read book High temperature Vapor filled Thermionic Converter written by R. Skoff and published by . This book was released on 1964 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High temperature Vapor filled Thermionic Converter written by R. Skoff and published by . This book was released on 1963 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Efforts were directed to the evaluation of ma terials, fabrication, and testing problems as sociated with the operation of high-temperature vapor-filled thermionic converters employing uranium-zirconium carbide emitters of cylindrical geometry. To date five of these converters have operated a total of 5300 hr. The last converter to be tested in this program is Cell K, which will soon be operable. In this reporting period, Cell H, which had two cesium vials, was placed in operation, while final assembly of Cell K was completed. Cell H output was 56 watts at an emitter temperature of 2380 K. The cesium temperature optimum for maximum power was 637 K.A collector temperature optimum was not obtained due to cooling limitations. (Author).
Download or read book HIGH TEMPERATURE VAPOR FILLED THERMIONIC CONVERTER written by and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress Development of a high temperature, vaporfilled thermionic converter for application with a nuclear reactor for space-vehicle electrical power generation is reported. Problems associated with the design and opera tion of a thermionic converter employing a UC-ZrC emitter, a cesium plasma for space charge neutralization, and a high-temperature collector are described. Emitter fabrication techniques are also described. A test cell employing a cylindrical UC-ZrC emitter, which was pressure bonded to a tantalum sleeve, and a low- temperature copper collector, was fabricated and operated for 400 hours to provide experimental data. The emitter was operated at temperatures of the order of 2000 deg C while the collector temperature was maintained at 200 to 300 deg C.A conceptual design for a thermionic power reactor incorporating the thermionic converter under development is also studied. It was concluded that a thermionic fuel element would be about 20 inches long and 0.68 inch in diameter and would incorporate 1O thermionic cells. The load voltage per fuel element would be about 14.5 volts and two elements would be connected in parallel (electrically) to provide an output of 29 volts. The over-all design would provide an electrical power level of approximately one megawatt. (auth).
Download or read book HIGH TEMPERATURE VAPOR FILLED THERMIONIC CONVERTER Quarterly Technical Progress Report March 15 Through June 30 1962 written by and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Research covers the work done on a bench test of an unclad thermionic converter. The objective is to produce an efficient, high-power-density, long- life thermionic power converter using a uranium-zirconium-carbide emitter and a high-temperature nickel collector. (auth).
Download or read book HIGH TEMPERATURE VAPOR FILLED THERMIONIC CONVERTER Quarterly Technical Progress Report for the Period Ending July 31 1963 written by and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Efforts were directed to the evaluation of materials, fabrication, and testing problems associated with the operation of high-temperature vapor-filled thermionic converters employing uranium-zirconium carbide emitters of cylindrical geometry. To date five of these converters have operated 5300 hr. Cell H, which had two cesium vials, was placed in operation, while final assembly of Cell K was completed. Cell H output was 56 watts at an emitter temperature of 2380 deg K. The cesium temperature optimum for maximum power was 637 deg K.A collector temperature optimum was not obtained due to cooling limitations. (auth).
Download or read book HIGH TEMPERATURE VAPOR FILLED THERMIONIC CONVERTER Quarterly Technical Progress Report July 1 Through September 30 1962 written by and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The post-test analysis of Cell E was completed with the exception of the microprobe analysis of the emitter structure. Interpretation of data from the analysis indicated the necessity of improving the cleanliness of future cell assemblies and especially the need for techniques to determine the emitter condition throughout final assembly. A 10 UC-90 ZrC emitter was installed in Cell F. Thermocouple installation and calibration and high-temperature vacuum emission tests are being conducted prior to the final closure of the cell. A second cell structure, Cell G, is on hand and an emitter will be installed pending the results of surface preparation. Vacuum emission studies carried out under other contracts on three UC compositions, 10 UC--90 ZrC, 30 UC--70 ZrC, and 90 UC--10 ZrC, demonstrate that emission behavior is essentially independent of bulk uranium content. Intentional poisoning'' of the surface of sample emitters was produced by exposure to air at room temperature. These findings were substantiated on the Mark V-E and V-F emitters. It was concluded, therefore, that the emitter surface must be activated in addition to providing a clean cell environment during operation. (auth).
Download or read book Research and Development for Barium Vapor filled Thermionic Energy Conversion Technology written by Martin Company and published by . This book was released on 1964 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book HIGH TEMPERATURE VAPOR FILLED THERMIONIC CONVERTER written by and published by . This book was released on 1963 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High temperature Vapor filled Thermionic Converter written by R. Skoff and published by . This book was released on 1963 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book HIGH TEMPERATURE VAPOR FILLED THERMIONIC CONVERTER Quarterly Technical Progress Report for the Period October 1 December 31 1962 written by and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cell F was operated at power for 484 hours. Cell F is the first cell in which the expected current emission density was observed from a carbide emitter in an engineered thermionic generator. Short-circuit currents of 120 amp were observed from the emitter in the cell. A maximum power output of 50 watts (5 w/ sq cm) was obtained at an emitter temperature of 2440 deg K. During steady state operation power was in the range from 10 to 30 watts. The cell was not optimized for maximum power. The contact potential in the cell agrees with that expected from a low work function carbide emitter and a fully cesiated collector. For a nominal contact potential of 1 volt and a short-circuit current of 120 amp, the optimum power should have been 120 watts, assuming no transport defects in the cell. Actually the maximum power output corresponding to a short-circuit current of 120 amp was more nearly 40 watts, indicating transport defects in the cell. (auth).
Download or read book Thermionic Energy Converter written by Dr. Walter L. Knecht and published by . This book was released on 1960 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development of a Low Temperature Vapor Filled Thermionic Converter written by F. G. Block and published by . This book was released on 1962 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of a low-temperature, plasma, thermionic converter is described. The converter uses a third electrode to ionize plasma so as to neutralize the space charge. The lower temperature thus achieved should significantly prolong the life of the converter and contribute to the development of a more reliable power supply for space application. Research was directed toward optimizing geometry and operating characteristics and investigating the effects of temperature and pressure, starting pulse, magnetic fields, and operation in both series and parallel circuitry. Materials were investigated to achieve practical electrodes by determining compatibility of material, atmospheric corrosion, and gas permeation. Converters were fabricated, evaluated, and life tested with the parameters optimized by the test program.
Download or read book A Symposium on High Temperature Conversion heat to Electricity written by and published by . This book was released on 1964 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Voltage Thermionic Converters written by General Motors Corporation. Allison Division and published by . This book was released on 1964 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several emitter materials, tantalum, tungsten and rhenium, and two emitter geometries, planar and excess area were evaluated in a flexible laboratory thermionic converter design. Results are reported from six converters that were tested for a total of 1070 hr. Experimental results from the excess area emitter converters did not exhibit the current enhancement observed in multicapillary and slotted emitter converters developed on a previous Air Force contract. While the electron currents in the passive mode at relatively low cesium pressure were in qualitative agreement with theory, the actual current densities obtained were not high enough to produce practical power densities at high output voltage. The method of emitter fabrication which used a niobium braze material appears to be a primary reason for the low performance.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1964-10 with total page 1668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Development of a Cesium vapor filled Thermionic Energy Converter written by G. Y. Eastman and published by . This book was released on 1962 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
