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  • AERODYNAMICS  (2)
  • Best. von Sulfid mit Jodnitrotetrazoliumchlorid  (1)
  • 1975-1979  (3)
  • 1955-1959
  • 1
    Publication Date: 2019-06-27
    Description: A configuration concept for augmenting the lift capability of low aspect ratio, thin wings, typically used on fighter aircraft was investigated. The fluid strake concept uses a jet sheet formed by blowing from a series of small orifices located in the side of the fuselage ahead of the wing to generate a stable vortex flow over the wing at high angle of attack. The effect of the location of the fluid strake relative to the wing was investigated for three different designs of the in-line orifices using a half-span model tested in a 7 by 10 foot low speed tunnel. Based on the results of the low speed test, a jet sheet producing module was incorporated into a NASA general research fighter model and tested in the Langley 7 by 10 foot high speed tunnel to determine the effectiveness of the fluid strake as a lift-enhancement device in the high-speed maneuver regime. Tests were conducted over a Mach number range from 0.3 to 0.8, with a jet momentum coefficient range from 0 to 0.24. Significant lift increments resulted at the higher angles of attack and drag polars were improved.
    Keywords: AERODYNAMICS
    Type: NASA-CR-158904 , NOR-78-24
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-27
    Description: A configuration concept for developing vortex lift, which replaces the physical wing strake with a jet sheet generated fluid strake, was investigated on a general research fighter model. The vertical and horizontal location of the jet sheet with respect to the wing leading edge was studied over a momentum coefficient range from 0 to 0.24 in the Langley 7- by 10-foot high speed tunnel over a Mach number range from 0.3 to 0.8. The angle of attack range studied was from -2 to 30 deg at sideslip angles of 0, -5, and 5 deg. Test data are presented without analysis.
    Keywords: AERODYNAMICS
    Type: NASA-TM-74049
    Format: application/pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 187-190 
    ISSN: 1618-2650
    Keywords: Best. von Sulfid mit Jodnitrotetrazoliumchlorid ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung S2− kann mit Jodnitrotetrazoliumchlorid (INT) innerhalb von 30 min photometrisch bestimmt werden. PO4 3−, Cl− und SO4 2− in Konzentrationen bis zu 5 · 10−2 mol/l, S2O3 2− bis zu 10−4 mol/l und S3O6 2− bis zu 2 · 10− mol/l stören nicht. Die untere Bestimmungsgrenze beträgt 3,4 · 10−5 mol/l, entsprechend 1 μg S2−. Als relative Standardabweichung ergibt sich bei der Bestimmung von 3,2 μg S2}±6,4 Rel.%.
    Notes: Summary The proposed photometric method is based on the reaction of S2− with iodo-nitro-tetrazolium chloride (INT). PO4 3−, Cl− and SO4 2− up to concentrations of 5 · 10−2 mol/l, S2O3 2− up to 10−4 mol/l and S3O6 2− up to 2 · 10−4 mol/l do not interfere. It is possible to determine S2− down to concentrations of 3.4 · 10−5 mol/l, corresponding to 1 μg of S2−, within 30 min. The relative standard deviation in the case of 3.2 μg of S2− is ±6.4% rel.
    Type of Medium: Electronic Resource
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