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  • Other Sources  (3)
  • Fluid Mechanics and Thermodynamics  (2)
  • Chemistry and Materials (General)  (1)
  • 2005-2009  (3)
  • 2008  (2)
  • 2007  (1)
  • 1
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    Advanced Thermal Simulator Testing: Thermal Analysis and Test Results (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Work at the NASA Marshall Space Flight Center seeks to develop high fidelity, electrically heated thermal simulators that represent fuel elements in a nuclear reactor design to support non-nuclear testing applicable to the development of a space nuclear power or propulsion system. Comparison between the fuel pins and thermal simulators is made at the outer fuel clad surface, which corresponds to the outer sheath surface in the thermal simulator. The thermal simulators that are currently being tested correspond to a SNAP derivative reactor design that could be applied for Lunar surface power. These simulators are designed to meet the geometric and power requirements of a proposed surface power reactor design, accommodate testing of various axial power profiles, and incorporate imbedded instrumentation. This paper reports the results of thermal simulator analysis and testing in a bare element configuration, which does not incorporate active heat removal, and testing in a water-cooled calorimeter designed to mimic the heat removal that would be experienced in a reactor core.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: Space Technology and Applications International Forum, STAIF-2008; Feb 10, 2008 - Feb 14, 2008; , Albuquerque, NM
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Wind-Tunnel Results of the B-52B with the X-43A Stack (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A low-speed wind-tunnel test was performed with a 3%-scale model of a booster rocket mated to an X-43A research vehicle, a combination referred to as the Hyper-X launch vehicle. The test was conducted both in freestream air and in the presence of a partial model of the B-52B airplane. The objectives of the test were to obtain force and moment data to generate structural loads affecting the pylon of the B-52B airplane and to determine the aerodynamic influence of the B-52B on the Hyper-X launch vehicle for evaluating launch separation characteristics. The windtunnel test was conducted at a low-speed wind tunnel in Hampton, Virginia. All moments and forces reported are based either on the aerodynamic influence of the B-52B airplane or are for the Hyper-X launch vehicle in freestream air. Overall, the test showed that the B-52B airplane imparts a strong downwash onto the Hyper-X launch vehicle, reducing the net lift of the Hyper-X launch vehicle. Pitching and rolling moments are also imparted onto the booster and are a strong function of the launch-drop angle of attack.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: 24th AIAA Applied Aerodynamics Conference (Paper 3850); Jun 05, 2006 - Jun 08, 2006; San Francisco, CA; United States|Journal of Spacecraft and Rockets 2007 (ISSN 0022-4650); 44; 4; 871-877
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Surface Analysis of 4-Aminothiophenol Adsorption at Polycrystalline Platinum Electrodes (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Formation of self-assembled monolayer (SAM) of 4-aminothiophenol (4-ATP) on polycrystalline platinum electrodes has been studied by surface analysis and electrochemistry techniques. The 4-ATP monolayer was characterized by cyclic voltammetry (CV), Raman spectroscopy, reflection absorption infrared (RAIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry (CV) experiments give an idea about the packing quality of the monolayer. RAIR and Raman spectra for 4-ATP modified platinum electrodes showed the characteristic adsorption bands for neat 4-ATP indicating the adsorption of 4-ATP molecules on platinum surface. The adsorption on platinum was also evidenced by the presence of sulfur and nitrogen peaks by XPS survey spectra of the modified platinum electrodes. High resolution XPS studies and RAIR spectrum for platinum electrodes modified with 4-ATP indicate that molecules are sulfur-bonded to the platinum surface. The formation of S-Pt bond suggests that ATP adsorption gives up an amino terminated SAM. Thickness of the monolayer was evaluated via angle-resolved XPS (AR-XPS) analyses. Derivatization of 4-ATP SAM was performed using 16-Br hexadecanoic acid.
    Keywords: Chemistry and Materials (General)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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