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  • 1
    Electronic Resource
    Electronic Resource
    Oscillations of CO and CO + H2 oxidation in air over supported and unsupported Pt catalysts (1995)
    Springer
    Catalysis letters 34 (1995), S. 313-320 
    Details
    ISSN: 1572-879X
    Keywords: oscillation ; CO + H2 cooxidation ; chemical sensor ; pellistor ; platinum ; platinum/alumina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Oscillation behaviour of the oxidation of CO (0.2–2.2%) in air over Pt wire coils and over Pt/Al2O3 catalysts deposited onto the coils (pellistors) has been investigated. The waveforms differ considerably between the two catalytic systems. Over unsupported Pt at 240–260° C, regular oscillations were accompanied by slowly declining activity and by deposition of carbon. Over supported Pt at 110–180°C, relatively complex but sustained oscillation occurred by a different mechanism. This oscillation was greatly enhanced by H2 (0.25–1.0%), and may involve fluctuations in the concentrations of CO and H2 around the supported catalyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806880
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    Paper (German National Licenses)
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  • 2
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    Internal Acoustics Measurements of a Full Scale Advanced Ducted Propulsor Demonstrator (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Acoustics measurements of a Pratt & Whitney full-scale ADP (Advanced Ducted Propulsor), an ultrahigh by-pass ratio engine, were conducted in the NASA Ames 40- by 80-Foot Wind Tunnel. This paper presents data from measurements taken from sensors on a fan exit guide vane in the ADP. Data from two sensors, one at mid-span and the other at the tip of the fan exit guide vane, are presented. At the blade passage frequency (BPF), the levels observed at the various engine and wind speeds were higher at the mid-span sensor than the tip sensor. The coherence between these internal sensors and external microphones were calculated and plotted as a function of angle (angles ranged from 5 degrees to 160 degrees) relative to the ADP longitudinal axis. At the highest engine and wind speeds, the coherence between the tip sensor and the external microphones was observed to decrease at higher multiples of the BPF. These results suggest that the rotor-stator interaction tones are stronger in the mid-span region than at the tip.
    Keywords: Aircraft Design, Testing and Performance
    Type: AIAA Paper 95-3034
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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