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  • Other Sources  (3)
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  • 1
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    Studies of pressure oscillations in a research dump combustor (1980)
    In:  Other Sources
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    Publication Date: 2011-12-21
    Description: A coaxial research dump combustor was used to investigate the acoustic modes structure and its effect on the inlet shock system. Acoustic wave structure was determined including the amplitude, frequency, and phase as a function of position. Inlet shock position, shock displacement, shock displacement frequency, and phase relative to acoustic wave structure were also defined. All results were compared to with one dimensional modeling.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA. Langley Research Center The 17th JANNAF Combust. Meeting, Vol. 1; p 553-559
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Effect of convective Mach number on mixing of coaxial circular and rectangular jets (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Rectangular supersonic free and coaxial jets were used to enhance mixing relative to a circular jet in a convective Mach number range of 0.5 to 2.2. The different convective Mach numbers were obtained by changing the central jet gas composition, the temperatures of the inner and outer flows, and the velocity of the coaxial flow. The experimental techniques used were schlieren photography, total pressure, and gas-sampling measurements. For all test conditions the rectangular jets showed substantial improved mixing relative to a circular jet. The free jets showed high mixing in the circumferential region of the jet while the coaxial jet had a high mixing rate inside the central jet.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Physics of Fluids A (ISSN 0899-8213); 3; 29-36
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Compressible spreading rates of supersonic coaxial jets (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The compressible spreading rates of two supersonic coaxial jets were studied experimentally. The center jet had a fully expanded Mach number of 3 and the outer jet of M = 1.8. The geometries of the center jet were circular and rectangular with two configurations, both with a 3:1 aspect ratio. The convective Mach numbers Mc were varied in the range between 0.25 and 2.25. The spreading rate of the center circular jet decreased with increasing Mc until it reached a constant value of 0.2 to 0.3 of the incompresible spreading rate for Mc larger than 1.4. The rectangular jets exhibited a similar drop at the same range of Mc, but their spreading rate was higher relative to the circular jet over the entire Mc range.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Experiments in Fluids (ISSN 0723-4864); 10; 2-3,; 161-167
    Format: text
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    NASA TECHNICAL REPORTS
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