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  • 1
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    Experimental and theoretical deposition rates from salt-seeded combustion gases of a Mach 0.3 burner rig (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Deposition rates on platinum-rhodium cylindrical collectors rotating in the cross streams of the combustion gases of a salt-seeded Mach 0.3 burner rig were determined. The collectors were internally air cooled so that their surface temperatures could be widely varied while they were exposed to constant combustion gas temperatures. The deposition rates were compared with those predicted by the chemically frozen boundary layer (CFBL) computer program, which is based on multicomponent vapor transport through the boundary layer. Excellent agreement was obtained between theory and experiment for the NaCl-seeded case, but the agreement lessened as the seed was changed to synthetic sea salt, NaNO3, and K2SO4, respectively, and was particularly poor in the case of Na2SO4. However, when inertial impaction was assumed to be the deposition mechanism for the Na2SO4 case, the predicted rates agreed well with the experimental rates. The former were calculated from a mean particle diameter that was derived from the measured intial droplet size distribution of the solution spray. Critical experiments showed that liquid phase deposits were blown off the smooth surface of the platinum-rhodium collectors by the aerodynamic shear forces of the high-velocity combustion gases but that rough or porous surfaces retained their liquid deposits.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-2225 , E-1752 , NAS 1.60:2225
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Deposition of Na2SO4 from salt-seeded combustion gases of a high velocity burner rig (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The mechanism of deposition of Na2SO4 was studied under controlled laboratory conditions and the results have been compared to a recently developed comprehensive theory of vapor deposition. Thus Na2SO4, NaCl, NaNO3 and simulated sea salt solutions were injected into the combustor of a nominal Mach 0.3 burner rig burning jet fuel at constant fuel/air ratios. The deposits formed on inert collectors, rotation in the cross flow of the combustion gases, were weighed and analyzed. Collector temperature was uniform and could be varied over a large range by internal air cooling. Deposition rates and dew point temperatures were determined. Supplemental testing included droplet size measurements of the atomized salt solutions. These tests along with thermodynamic and transport calculations were utilized in the interpretation of the deposition results.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-83751 , E-2237 , NAS 1.15:83751 , TMS-AIME Fall Meeting; Sep 17, 1984 - Sep 19, 1984; Detroit, MI; United States
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    NASA TECHNICAL REPORTS
  • 3
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    Combustion of solid carbon rods in zero and normal gravity (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In order to investigate the mechanism of carbon combustion, spectroscopic carbon rods were resistance ignited and burned in an oxygen environment in normal and zero gravity. Direct mass spectrometric sampling was used in the normal gravity tests to obtain concentration profiles of CO2, CO, and O2 as a function of distance from the carbon surface. The experimental concentrations were compared to those predicted by a stagnant film model. Zero gravity droptower tests were conducted in order to assess the effect of convection on the normal gravity combustion process. The ratio of flame diameter to rod diameter as a function of time for oxygen pressures of 5, 10, 15, and 20 psia was obtained for three different diameter rods. It was found that this ratio was inversely proportional to both the oxygen pressure and the rod diameter.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-79303 , E-255 , Ann. AICE Meeting; Nov 25, 1979 - Nov 29, 1979; San Francisco
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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