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Results 15281 - 15290 of 18,906
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Statistical Study of Turbulence: Spectral Functions and Correlation Coefficients

Statistical Study of Turbulence: Spectral Functions and Correlation Coefficients

Date: July 1, 1958
Creator: Frenkiel, Francois N.
Description: In reading the publications on turbulence of different authors, one often runs the risk of confusing the various correlation coefficients and turbulence spectra. We have made a point of defining, by appropriate concepts, the differences which exist between these functions. Besides, we introduce in the symbols a few new characteristics of turbulence. In the first chapter, we study some relations between the correlation coefficients and the different turbulence spectra. Certain relations are given by means of demonstrations which could be called intuitive rather than mathematical. In this way we demonstrate that the correlation coefficients between the simultaneous turbulent velocities at two points are identical, whether studied in Lagrange's or in Euler's systems. We then consider new spectra of turbulence, obtained by study of the simultaneous velocities along a straight line of given direction. We determine some relations between these spectra and the correlation coefficients. Examining the relation between the spectrum of the turbulence measured at a fixed point and the longitudinal-correlation curve given by G. I. Taylor, we find that this equation is exact only when the coefficient is very small.
Contributing Partner: UNT Libraries Government Documents Department
Vibration survey of four representative types of air-cooled turbine blades

Vibration survey of four representative types of air-cooled turbine blades

Date: July 1, 1958
Creator: Calvert, Howard F & Smith, Gordon T
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Wind-tunnel investigation at low speeds of flight characteristics of a sweptback-wing jet-transport airplane model equipped with an external-flow jet-augmented slotted flap

Wind-tunnel investigation at low speeds of flight characteristics of a sweptback-wing jet-transport airplane model equipped with an external-flow jet-augmented slotted flap

Date: July 1, 1958
Creator: Johnson, Joseph L , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Wind-tunnel investigation of effects of spoiler location, spoiler size, and fuselage nose shape on directional characteristics of a model of a tandem-rotor helicopter fuselage

Wind-tunnel investigation of effects of spoiler location, spoiler size, and fuselage nose shape on directional characteristics of a model of a tandem-rotor helicopter fuselage

Date: July 1, 1958
Creator: Williams, James L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Wind-tunnel investigation of the high-subsonic static longitudinal stability characteristics of several wing-body configurations designed for high lift-drag ratios at a Mach number of 1.4

Wind-tunnel investigation of the high-subsonic static longitudinal stability characteristics of several wing-body configurations designed for high lift-drag ratios at a Mach number of 1.4

Date: July 1, 1958
Creator: Fournier, Paul G
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effects of canards on airplane performance and stability

Effects of canards on airplane performance and stability

Date: July 7, 1958
Creator: Hall, Charles F & Boyd, John W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Longitudinal stability and control characteristics at Mach numbers of 1.41 and 2.01 of a 67 degree swept-wing airplane configuration with canard control surfaces

Longitudinal stability and control characteristics at Mach numbers of 1.41 and 2.01 of a 67 degree swept-wing airplane configuration with canard control surfaces

Date: July 7, 1958
Creator: Spearman, M Leroy & Robinson, Ross B
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Performance of multiple jet-exit installations

Performance of multiple jet-exit installations

Date: July 7, 1958
Creator: Swihart, John M & Nelson, William J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Performance of multiple jet-exit installations

Performance of multiple jet-exit installations

Date: July 7, 1958
Creator: Nelson, W. J. & Swihart, J. M.
Description: Internal aerodynamics and performance of clustered jet-exit installations at transonic speeds.
Contributing Partner: UNT Libraries Government Documents Department
Qualitative measurements of the effective heats of ablation of several materials in supersonic air jets at stagnation temperatures up to 11,000 F

Qualitative measurements of the effective heats of ablation of several materials in supersonic air jets at stagnation temperatures up to 11,000 F

Date: July 7, 1958
Creator: Rashis, Bernard; Witte, William G & Hopko, Russell N
Description: None
Contributing Partner: UNT Libraries Government Documents Department