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  • 1
    facet.materialart.
    Unknown
    Review of chemical-kinetic problems of future NASA missions, II: Mars entries (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The present work aims to derive a set of thermomechanical relaxation rate parameters and chemical reaction rate coefficients relevant to future interplanetary missions. It also attempts to assess the impact of thermochemical nonequilibrium phenomena on radiative heating rates for the stagnation point of the Martian entry vehicle.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Journal of Thermophysics and Heat Transfer (ISSN 0887-8722); 8; 1; p. 9-22
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Atmospheric entry of nuclear-powered vehicles due to accidental/inadvertent termination of operations (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The entries of the radioactive components into earth's atmosphere resulting from an accident or inadvertent abort of a space vehicle powered by nuclear-thermal-rockets are investigated. The study is made for a typical piloted Mars mission vehicle incapacitated by an accident or malfunction during the trans-Mars-injection maneuver due to simultaneous multiple failures of its component systems. The three different accident/abort modes considered are the following: (1) a constant-rate angular pitching motion of the vehicle, (2) a constant-acceleration angular pitching motion of the vehicle, and (3) the rocket engine breaks away from the rest of the vehicle with a finite relative (dispersion) velocity. The speeds and angles of the atmospheric entries are calculated for each mode for different values of the time of the accident, pitching rate, acceleration, and dispersion velocity. For the most severe entry speeds and flight-path angles, the stagnation-point pressures, heat transfer rates, thickness, and mass per unit area of the heat shields necessary to protect the radioactive components from disintegrating, deceleration g-loads, and high ground-impact velocities are calculated. The study points out that the high g-loads and high ground-impact velocities are the most serious problems that must be addressed.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 92-3270
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Bibliography of Doctor Chul Park (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This document contains a comprehensive bibliography of the published works, and a short biography, of Dr. Chul Park. The contents of this bibliography were compiled primarily from the NASA RECON data base. The RECON citations have been modified to appear in a uniform format with all other listed citations . These other citations were located by computer searches in the INSPEC, NTIS, COMPENDEX, and Chemical Abstracts data bases, as well as through the cooperation of Dr. Chul Park, and his associates in the Reacting Flow Environments Branch at NASA Ames Research Center. All citations are presented in an approximate reverse chronological order from the present date. This work was created to honor the occasion of Dr. Chul Park's retirement on December 14, 1994, after 27 years of distinguished government service at the NASA Ames Research Center.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-TM-110353 , A-950065 , NAS 1.15:110353
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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