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  • CHEMISTRY AND MATERIALS (GENERAL)  (2)
  • AIRCRAFT PROPULSION AND POWER  (1)
  • 1
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    Airfoil deposition model (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The methodology to predict deposit evolution (deposition rate and subsequent flow of liquid deposits) as a function of fuel and air impurity content and relevant aerodynamic parameters for turbine airfoils is developed in this research. The spectrum of deposition conditions encountered in gas turbine operations includes the mechanisms of vapor deposition, small particle deposition with thermophoresis, and larger particle deposition with inertial effects. The focus is on using a simplified version of the comprehensive multicomponent vapor diffusion formalism to make deposition predictions for: (1) simple geometry collectors; and (2) gas turbine blade shapes, including both developing laminar and turbulent boundary layers. For the gas turbine blade the insights developed in previous programs are being combined with heat and mass transfer coefficient calculations using the STAN 5 boundary layer code to predict vapor deposition rates and corresponding liquid layer thicknesses on turbine blades. A computer program is being written which utilizes the local values of the calculated deposition rate and skin friction to calculate the increment in liquid condensate layer growth along a collector surface.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Turbine Eng. Hot Sect. Technol. (HOST); p 241-257
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A high pressure modulated molecular beam mass spectrometric sampling system (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The current state of understanding of free-jet high pressure sampling is critically reviewed and modifications of certain theoretical and empirical considerations are presented. A high pressure, free-jet expansion, modulated molecular beam, mass spectrometric sampling apparatus was constructed and this apparatus is described in detail. Experimental studies have demonstrated that the apparatus can be used to sample high temperature systems at pressures up to one atmosphere. Condensible high temperature gaseous species have been routinely sampled and the mass spectrometric detector has provided direct identification of sampled species. System sensitivity is better than one tenth of a part per million. Experimental results obtained with argon and nitrogen beams are presented and compared to theoretical predictions. These results and the respective comparison are taken to indicate acceptable performance of the sampling apparatus. Results are also given for two groups of experiments related to hot corrosion studies. The formation of gaseous sodium sulfate in doped methane-oxygen flames was characterized and the oxidative vaporization of metals was studied in an atmospheric pressure flowing gas system to which gaseous salt partial pressures were added.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA-TM-73720 , E-9270
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Thermodynamics and kinetics of the sulfation of porous calcium silicate (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The sulfation of plasma sprayed calcium silicate in flowing SO2/air mixtures at 900 and 1000 C was investigated thermogravimetrically. Reaction products were analyzed using electron microprobe and X-ray diffraction analysis techniques, and results were compared with thermodynamic predictions. The percentage, by volume, of SO2 in air was varied between 0.036 and 10 percent. At 10 percent SO2 the weight gain curve displays a concave downward shoulder early in the sulfation process. An analytical model was developed which treats the initial process as one which decays exponentially with increasing time and the subsequent process as one which decays exponentially with increasing weight gain. At lower SO2 levels the initial rate is controlled by the reactant flow rate. At 1100 C and 0.036 percent SO2 there is no reaction, in agreement with thermodynamic predictions.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA-TM-82769 , E-1023 , Fall Meeting of the Electrochem. Soc., Inc.,; Oct 11, 1981 - Oct 17, 1981; Denver, CO; United States
    Format: application/pdf
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