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  • 1
    Publication Date: 2013-08-31
    Description: A study was made to determine if existing data for straight-channel single-plane divergence diffusers together with boundary-layer methods could be practically employed to predict conical diffuser performance in the high-speed flow regime. A semiempirical correlation technique, which uses the experimental performance of a straight-channel single-plane divergence diffuser, and a momentum integral boundary-layer method were employed to predict conical diffuser performance. Neither of these methods is applicable when the boundary layer separates. The momentum integral method was used to study the relative importance of various boundary layer parameters in correlating unstalled diffuser performance. Other investigators have found that the best diffuser performance occurs when the diffuser is operating in the transitory stall regime. Since the analytical methods presented in this report are not applicable after the point of boundary-layer separation, a criterion was established from examination of experimental tests which allows the designer to ascertain approximate diffuser performance in the transitory stall regime.
    Keywords: FLUID MECHANICS
    Type: NASA-TM-X-2605 , E-6908
    Format: application/pdf
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  • 2
    Publication Date: 2013-08-31
    Description: Efficiency estimates of turbine and compressor components of Brayton rotating unit during hot closed loop operation
    Keywords: AUXILIARY SYSTEMS
    Type: E-6343 , NASA-TM-X-2350
    Format: application/pdf
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  • 3
    Publication Date: 2013-08-31
    Description: Reynolds number effect on single stage axial flow turbine in air
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-TN-D-4383
    Format: application/pdf
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  • 4
    Publication Date: 2013-08-31
    Description: A 13.65 cm tip diameter backswept centrifugal impeller having a tandem inducer and a design mass flow rate of 0.907 kg/sec was experimentally investigated to establish stage and impeller characteristics. Tests were conducted with both a cascade diffuser and a vaneless diffuser. A pressure ratio of 5.9 was obtained near surge for the smallest clearance tested. Flow range at design speed was 6.3 percent for the smallest clearance test. Impeller exit to shroud axial clearance at design speed was varied to determine the effect on stage and impeller performance.
    Keywords: AERODYNAMICS
    Type: NASA-TP-1091
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 485 (1982), S. 92-100 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxoargentates(I) of Alkali Metals. On Na3AgO2Na3AgO2 has been prepared anew (light pale-yellow powder samples; clear transparent single crystals). It crystallizes orthorhombic (space group Ibam) with a = 5.463, b = 10.926, c = 5.926 Å, Z = 4, drö = 3.94 g X cm-3, dpyk = 3.89 g X cm-3; parameters are given in the text. The structure of Na3AgO2, marked by linear “dumb-bells” [O—Ag—O], d(Ag→O) = 2.09 Å is a novel variant of Na2O. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, have been calculated and are discussed.
    Notes: Erneut dargestelltes Na3AgO2 (hell blaß-gelbes Pulver, glasklare Einkristalle), orthorhombisch, Raumgruppe Ibam mit a = 5,463 Å, b = 10,926 Å, c = 5,926 Å, Z = 4, drö = 3,94 g · cm-3, dpyk = 3,89 g · cm-3, Lageparameter siehe Text, ist strukturell durch lineare „Hanteln“ [O—Ag=O], d(Ag→O) = 2,095 Å ausgezeichnet. Es liegt eine neuartige Na2O-Variante vor.Der Madelung-Anteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, werden berechnet und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 485 (1982), S. 101-114 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: K4[Ag404] Structure TypeM4[Ag4O4] (M = Li—Cs) and M4[Cu4O4] (M = Li—Rb) have been prepared anew; as an example the crystal structure of K4[Ag4O4] has been revised.Contrary to our first report [2, 3] it crystallizes in the space-group I4m2 with the “ring” [Ag4O4]4- which is not plane, however. Each two O2- (trans-arrangement) are rather (0.02 Å) above and below the plane of the “ring”, respectively. The new parameters are given in the text. The distances, for example d(Ag+·O2-) = 2.058 Å and the Madelung Part of Lattice Energy, MAPLE, are both in a very good agreement with the measurements and calculations, respectively, which have been done on other ternary oxides with silver.
    Notes: Die Verbindungen M4[Ag4O4] mit M = Li—Cs und M4[Cu4O4] mit M = Li—Rb wurden erneut dargestellt; die Kristallstruktur wurde am K4[Ag4O4] überprüft.Entgegen unserem ersten Befund [2, 3] (I4) liegt in I4m2 zwar die Gruppe [Ag4O4]4- vor, doch sind je zwei O2- (trans-Stellung) etwas (0,02 Å) oberhalb bzw. unterhalb der “Ringebene” ausgelenkt. Bezüglich der neuen Parameter siehe Text. Die Abstände, z. B. d(Ag+→O2-) = 2,058 Å, sowie der Madelung-Anteil der Gitterenergie, MAPLE, stimmen mit Messungen bzw. Berechnungen an anderen ternären Oxiden mit Silber sehr gut überein.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 494 (1982), S. 20-30 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Oxocuprates(I). On Rb3Cu5O4New obtained is Rb3Cu5O4, powder as well as transparent single crystals greenish yellow. The monoclinic structur [P21/c, a = 9.886(1), b = 7.508(1), c = 14.401(2) Å, β = 106.85(7)°, Z = 4, four-circle diffractometer data, R = 10.6% for 1 453 hkl, MoKα] is characterized by spiralic chains —O—Cu—O—Cu— parallel to [100], which are tied together by additional Cu+. Motifs of mutual adjunction, Effective Coordination Numbers, ECoN, and the Madelung Part of Lattice Energy, MAPLE, are calculated and discussed.
    Notes: Neu dargestellt wurde Rb3Cu5O4, Pulver und transparente Einkristalle grüngelb. Die monokline Struktur [P21/c, a = 9,886(1), b = 7,508(1), c = 14,401(2) Å, β = 106,85(7)°, Z = 4, Vierkreisdiffraktometerdaten, R = 10,6% für 1 453 hkl, MoKα] ist charakterisiert durch Spiralketten —O—Cu—O—Cu—, die längs [100] verlaufen und über weitere Cu+ verknüpft sind. Die Motive der gegenseitigen Zuordnung, Effektive Koordinationszahlen, ECoN, sowie der Madelunganteil der Gitterenergie MAPLE, werden berechnet und diskutiert.
    Additional Material: 1 Ill.
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  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Oxocuprates(I): On CsCuONew obtained is CsCuO, powder as well as transparent single crystals yellow greenish. The orthorhombic structure (Ama2, a = 5.086(1), b = 10.238(2), c = 5.899(1) Å, Z = 4, four-circle-diffractometer data, R = 9.6% for 379 hkl, MoKα) is characterized by “zick-zack”-chains infin;1[CuO2/2] parallel to [100], which are not tied together by additional Cu+. Motifs of mutual adjunction, Effective Coordination Numbers, ECoN, and the Madelung Part of Lattice Energy, MAPLE, are calculated and discussed.
    Notes: Neu dargestellt wurde CsCuO, Pulver und transparente Einkristalle gelbgrün. Die orthorhombische Struktur (Ama2, a = 5,086(1), b = 10,238(2), c = 5,899(1) Å, Z = 4, Vierkreisdiffraktometerdaten, R = 9,6% für 379 hkl, MoKα) ist charakterisiert durch Zick-Zack-Ketten infin;1[CuO2/2] entlang [100], die nicht durch weitere Cu+ verknüpft sind.Die Motive der gegenseitigen Zuordnung, Effektive Koordinationszahlen, ECoN, sowie der Madelung-Anteil der Gitterenergie, MAPLE, werden berechnet und diskutiert.
    Additional Material: 1 Ill.
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  • 9
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    In:  Other Sources
    Publication Date: 2011-08-16
    Description: Brayton cycle electric power generator simulation to study turbomachinery startup
    Keywords: AUXILIARY SYSTEMS
    Type: ; 79, 82, 83 (
    Format: text
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  • 10
    Publication Date: 2013-08-31
    Description: Operational test and evaluation of Brayton cycle electric generator
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-2043 , E-5456
    Format: application/pdf
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