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  • 1
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    Investigation of porous media combustion by coherent anti-Stokes Raman spectroscopy (2010)
    Springer
    Details
    Publication Date: 2010-06-10
    Print ISSN: 0723-4864
    Electronic ISSN: 1432-1114
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 2
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    Simultaneous Temperature and Velocity Measurements in a Large-Scale, Supersonic, Heated Jet (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Two laser-based measurement techniques have been used to characterize an axisymmetric, combustion-heated supersonic jet issuing into static room air. The dual-pump coherent anti-Stokes Raman spectroscopy (CARS) measurement technique measured temperature and concentration while the interferometric Rayleigh scattering (IRS) method simultaneously measured two components of velocity. This paper reports a preliminary analysis of CARS-IRS temperature and velocity measurements from selected measurement locations. The temperature measurements show that the temperature along the jet axis remains constant while dropping off radially. The velocity measurements show that the nozzle exit velocity fluctuations are about 3% of the maximum velocity in the flow.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: 55th JANNAF Propulsion Meeting/42nd Combustion/30th Airbreathing Propulsion/30th Exhaust Plume Technology/ 24th Propulsion Systems Hazards/12th SPIRITS User Group Joint Subcommittee Meeting; May 12, 2006 - May 16, 2006; Newton, MA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    CARS Temperature and Species Concentration Measurements in a Supersonic Combustor with Normal Injection (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The dual-pump coherent anti-Stokes Raman spectroscopy (CARS) method was used to measure temperature and the absolute mole fractions of N2, O2 and H2 in a supersonic combustor. Experiments were conducted in the NASA Langley Direct-Connect Supersonic Combustion Test Facility. CARS measurements were performed at the facility nozzle exit and at three planes downstream of fuel injection. Processing the CARS measurements produced maps of the mean temperature, as well as quantitative N2 and O2 and qualitative H2 mean mole fraction fields at each plane. The CARS measurements were also used to compute correlations between fluctuations of the different simultaneously measured parameters. Comparisons were made between this 90 degree angle fuel injection case and a 30 degree fuel injection case previously presented at the 2004 Reno AIAA Meeting.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: AIAA Paper 2005-0616 , 43rd Aerospace Sciences Meeting and Exhibit; Jan 10, 2005 - Jan 13, 2005; Reno, NV; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Dual-Pump CARS Temperature and Species Concentration Measurements in a Supersonic Combustor (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The dual-pump coherent anti-Stokes Raman scattering (CARS) method was used to measure temperature and the mole fractions of N2 and O2 in a supersonic combustor. Experiments were conducted in NASA Langley Research Center s Direct Connect Supersonic Combustion Test Facility. In this facility, H2 and oxygen-enriched air burn to increase the enthalpy of the simulated air test gas. This gas is expanded through a Mach 2 nozzle and into a combustor model consisting of a short constant-area section followed by a small rearward-facing step and another constant-area section. At the end of this straight section, H2 fuel is injected at Mach 2 and at a 30 angle with respect to the freestream. One wall of the duct then expands at a 3 angle for over 1 meter. The ensuing combustion is probed optically through ports in the side of the combustor. Dual-pump CARS measurements were performed at the facility nozzle exit and at four planes downstream of fuel injection. Maps are presented of the mean temperature, as well as N2 and O2 mean mole fraction fields. Correlations between fluctuations of the different measured parameters are also presented.
    Keywords: Fluid Mechanics and Thermodynamics
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    NASA TECHNICAL REPORTS
  • 5
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    CARS Temperature Measurements in a Combustion-Heated Supersonic Jet (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Measurements were made in a combustion-heated supersonic axi-symmetric free jet from a nozzle with a diameter of 6.35 cm using dual-pump Coherent Anti-Stokes Raman Spectroscopy (CARS). The resulting mean and standard deviation temperature maps are presented. The temperature results show that the gas temperature on the centerline remains constant for approximately 5 nozzle diameters. As the heated gas mixes with the ambient air further downstream the mean temperature decreases. The standard deviation map shows evidence of the increase of turbulence in the shear layer as the jet proceeds downstream and mixes with the ambient air. The challenges of collecting data in a harsh environment are discussed along with influences to the data. The yield of the data collected is presented and possible improvements to the yield is presented are discussed.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: AIAA Paper 2009-524 , LF99-7077 , 47th AIAA Aerospace Sciences Meeting and Exhibit Including The New Horizons Forum and Aerospace Exposition; Jan 05, 2009 - Jan 08, 2009; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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