Download or read book The 30 KW Ammonia Arcjet Technology written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-04 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: The technical results are summarized of a 30 kW class ammonia propellant arcjet technology program. Evaluation of previous arcjet thruster performance, including materials analysis of used thruster components, led to the design of an arcjet with improved performance and thermal characteristics. Tests of the new engine demonstrated that engine performance is relatively insensitive to cathode tip geometry. Other data suggested a maximum sustainable arc length for a given thruster configuration, beyond which the arc may reconfigure in a destructive manner. A flow controller calibration error was identified. This error caused previously reported values of specific impulse and thrust efficiency to be 20 percent higher than the real values. Corrected arcjet performance data are given. Duration tests of 413 and 252 hours, and several tests 100 hours in duration, were performed. The cathode tip erosion rate increased with increasing arc current. Elimination of power source ripple did not affect cathode tip whisker growth. Results of arcjet modeling, diagnostic development and mission analyses are also discussed. The 30 kW ammonia arcjet may now be considered ready for development for a flight demonstration, but widespread application of 30 kW class arcjet will require improved efficiency and lifetime. Deininger, W. D. and Chopra, A. and Pivirotto, T. J. and Goodfellow, K. D. and Barnett, J. W. Jet Propulsion Laboratory NASA-CR-186850, NAS 1.26:186850, JPL-PUBL-90-4 NAS7-918; RTOP 644-11-X2...
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Microengineering Technology for Space Systems written by Henry Helvajian and published by AIAA. This book was released on 1997 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: A follow-on to Micro- and Nanotechnology for Space Systems, this second monograph in the series uses the more universal term microengineering to define the discipline and processes that lead to the development of an integrated and intelligent microinstrument. Microengineering Technology for Space Systems addresses specific issues concerning areas for ASIM application in current space systems, operation in the space environment, ultra-high-density packaging and nonsilicon materials-processing tools, and the feasibility of the nanosatellite concept.
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Download or read book Hydrazine and Its Derivatives written by Eckart Walter Schmidt and published by John Wiley & Sons. This book was released on 2001-08-24 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new edition of the authoritative source on hydrazine chemistry In the past century, hydrazine, an important intermediate in the synthesis of countless chemicals with N-N bonds, has grown into a major industrial commodity with a wide range of uses. It is used as a fuel in rocket propulsion, as a boiler feedwater deoxygenating agent, and in the manufacture of foamed plastics, pharmaceuticals, and biodegradable pesticides and herbicides, to name just a few uses. Since the first edition of Hydrazine and Its Derivatives: Preparation, Properties, Applications was published in 1984, there has been considerable development in this field and many new aspects of hydrazine chemistry and applications have evolved. Offering an overview of hydrazines and their industrial applications, this book also provides a compilation of numerous references to the scientific and technical literature arranged in a systematic manner, allowing the reader to find the necessary information by accessing the pages either from the table of contents or the alphabetical subject index. Some other features of the significantly enlarged Second Edition include: Frequent "see also" cross-references/links to other relevant sections of the bookOver 8,400 references, most of which cover the period from 1980 to 1998 Extremely thorough, encyclopedia-style coverage of topics Information to aid in the design of environmentally benign, biodegradable pesticides and more energetic rocket propellants Background information on the adverse effects of pesticide residue in food Hydrazine and Its Derivatives: Preparation, Properties, Applications, Second Edition is the most comprehensive book ever published on hydrazines, and this new edition is indispensable reading material for chemists, toxicologists, environmentalists, propulsion engineers, materials engineers, and satellite builders.
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