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  • 11
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    Unknown
    Operating characteristics of a hydrogen-argon plasma torch for supersonic combustion applications (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The residence time of the combustible mixture in the combustion chamber of a scramjet engine is much less than the time normally required for complete combustion. Hydrogen and hydrocarbon fuels require an ignition source under conditions typically found in a scramjet combustor. Analytical studies indicate that the presence of hydrogen atoms should greatly reduce the ignition delay in this environment. Because hydrogen plasmas are prolific sources of hydrogen atoms, a low-power, uncooled hydrogen plasma torch has been built and tested to evaluate its potential as a possible flame holder for supersonic combustion. The torch was found to be unstable when operated on pure hydrogen; however, stable operation could be obtained by using argon as a body gas and mixing in the desired amount of hydrogen. The stability limits of the torch are delineated and its electrical and thermal behavior documented. An average torch thermal efficiency of around 88 percent is demonstrated.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 5; 129-133
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Oxidation-induced contraction and strengthening of boron fibers (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An investigation of the physical and mechanical effects of thermal treatment in a controlled oxygen-argon atmosphere on boron fibers is reported, with attention to the optimization of such treatment as a secondary processing method for improvement of fiber strength. The strengthening mechanism is comprised of an oxidation-induced axial contraction of the fiber, accompanied by axial compression of strength-limiting flaws within the fiber's tungsten boride core. It was found that after an oxidation contraction of 0.3% near 900 C, and a slight surface etch near 100 C, the average tensile strength of 203-micron fibers increased from 500 to 800 ksi. Various physical observations are used to develop mechanistic models of oxidation, contraction, and the formation of new flaws in the boron sheath at contractions greater than 0.3%.
    Keywords: COMPOSITE MATERIALS
    Type: Annual Conference on Composites and Advanced Ceramic Materials; Jan 18, 1981 - Jan 22, 1981; Merritt Island, FL
    Format: text
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    NASA TECHNICAL REPORTS
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