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  • 11
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    A Fast, Reliable, Automatic Shimming Procedure Using 1H Chemical-Shift-Imaging Spectroscopy (1995)
    Elsevier
    Details
    Publication Date: 1995-09-01
    Print ISSN: 1064-1866
    Electronic ISSN: 1096-0872
    Topics: Medicine , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 12
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    Homonuclear 14N Overtone Spin-Exchange Spectroscopy (1993)
    Elsevier
    Details
    Publication Date: 1993-06-01
    Print ISSN: 1064-1858
    Electronic ISSN: 1096-0864
    Topics: Medicine , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 13
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    Composite propellant combustion modeling with a porous plate burner (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A burner is designed to model on a large scale (millimeters) the complex vapor phase processes that take place on awkwardly small scales (about a hundred microns) in the combustion of practical AP/ composite propellants at conventional pressures. Binder vapor evolution is modeled with gaseous fuel (ethane in the experiments reported) flow through a porous plate and oxidizer vapor with the flow of a gaseous oxidizer (air and enriched air in the experiments reported) through discrete holes in the porous plate. Measured flame standoff distance and surface temperature variations are consistent with theoretical predictions at atmospheric pressure. Data obtained at several atmospheres are discussed in the light of the current theories of propellant burning that place varying emphasis on the roles of chemical kinetics and fluid dynamic diffusion/mixing in the vapor phase of a burning composite propellant. The potential and proposed future applications of the burner are indicated.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIAA PAPER 76-669 , Propulsion Conference; Jul 26, 1976 - Jul 29, 1976; Palo Alto, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    Microwave measurement of the solid propellant pressure-coupled response function (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The results of an investigation are presented on the applicability of a microwave Doppler shift technique for directly determining propellant response functions over the desired frequency range. The investigation consisted of three phases. In Phase 1 the validity of the technique was established by comparing measured pressure-coupled response function data to existing data from T-burners and rotating valve tests. In Phase 2 a new microwave burner-pressure modulation system capable of achieving frequencies and mean chamber pressures of at least 1500 Hz and 10.5 MPa (1500 psia), respectively, was developed. During Phase 3 test firings are being carried out to define the frequency limit, response function resolution, and precision of the new design.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 79-1211 , AIAA, SAE, and ASME, Joint Propulsion Conference; Jun 18, 1979 - Jun 20, 1979; Las Vegas, NV
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    Some experiments related to L-star instability in rocket motors (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The role of solid phase heterogeneity on the low-pressure L-star instability of nonmetallized AP/PBAN propellants is explored. Four particle size distributions are employed in propellants that are otherwise identical. Over one hundred test firings were conducted in the 21/2 in. diameter L-star burner. Pressure time histories in the chamber and color movies of two firings constitute the raw data. An economical firing program was used which enables the interesting range of L-star values to be covered during a single firing (at a set mean pressure), through the variations in the depleting propellant volume. Time-independent combustion, Helmholtz mode, chuff mode, and the pressure-burst phenomena are revealed as the principal signatures. Of these, the Helmholtz mode is found to be the most ordered form of instability.
    Keywords: PROPELLANTS
    Type: NASA-CR-135766
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 16
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    Some experiments related to L-star instability in rocket motors (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The influence of condensed phase heterogeneity on the L-star instability of nonmetallized AP/PBAN propellants is explored using four propellants (with monomodal AP particle distributions having 50 per cent weight average points at 11, 39.5, 175, and 350 microns). An economical firing program is used. One-dimensional nature of the Helmholtz mode and the complex nature of the chuff mode are revealed through color movies. The stability boundary on the L-star pressure plot is found to be parabolic. Frequency correlations and many other features reveal the important role of condensed phase details in propellant combustion.
    Keywords: PROPELLANTS
    Type: AIAA PAPER 73-1300 , Propulsion Conference; Nov 05, 1973 - Nov 07, 1973; Las Vegas, NV; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Feasibility demonstration of a variable frequency driver-microwave transient regression rate measurement system (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The feasibility of a system capable of rapidly and directly measuring the low-frequency (motor characteristics length bulk mode) combustion response characteristics of solid propellants has been investigated. The system consists of a variable frequency oscillatory driver device coupled with an improved version of the JPL microwave propellant regression rate measurement system. The ratio of the normalized regression rate and pressure amplitudes and their relative phase are measured as a function of varying pressure level and frequency. Test results with a well-characterized PBAN-AP propellant formulation were found to compare favorably with the results of more conventional stability measurement techniques.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: AIAA PAPER 76-105 , Aerospace Sciences Meeting; Jan 26, 1976 - Jan 28, 1976; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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