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On the recording of turbulent longitudinal and transverse fluctuations

On the recording of turbulent longitudinal and transverse fluctuations

Date: August 1, 1951
Creator: Reichardt, H
Description: A thorough understanding of the turbulent flow movements cannot be arrived at from investigations of the temporal mean values of the flows alone. Study of the fluctuation phenomena themselves is indispensable. Thus turbulence research entered a new promising stage when investigators started performing fluctuation measurements and basing theories on those measurements. The investigations of fluctuations carried out so far refer almost exclusively to the so-called isotropic turbulence. It represents a damping phenomenon; it is the simplest type of turbulence where merely the longitudinal fluctuations need to be measured. However, it is precisely nonisotropic turbulence which involves the most essential problem of the turbulent exchange movement and the turbulent apparent friction. Investigation of nonisotropic turbulence requires measurement of longitudinal and transverse fluctuations.
Contributing Partner: UNT Libraries Government Documents Department
On the representation of the stability region in oscillation problems with the aid of the Hurwitz determinants

On the representation of the stability region in oscillation problems with the aid of the Hurwitz determinants

Date: August 1, 1952
Creator: Sponder, E W
Description: This report concerns the use of the Hurwitz determinants in defining boundaries of regions where oscillatory phenomena are to be stable or unstable. A simplification is suggested as an aid in reducing the computations usually required, although it is emphasized that point checks in the various regions defined are required using the complete set of Hurwitz determinants or some other complete stability determination.
Contributing Partner: UNT Libraries Government Documents Department
On the Resistance of spheres and ellipsoids in wind tunnels

On the Resistance of spheres and ellipsoids in wind tunnels

Date: January 1, 1921
Creator: Riabouchinsky, D P
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On the resistance of the air at high speeds and on the automatic rotation of projectiles

On the resistance of the air at high speeds and on the automatic rotation of projectiles

Date: April 1, 1921
Creator: Riabouchinski, D
Description: Here, the laws governing the flow of a compressible fluid through an opening in a thin wall are applied to the resistance of the air at high speeds, especially as applied to the automatic rotation of projectiles. The instability which we observe in projectiles shot into the air without being given a moment of rotation about their axis of symmetry, or without stabilizing planes, is a phenomenon of automatic rotation. It is noted that we can prevent this phenomenon of automatic rotation by bringing the center of gravity sufficiently near one end, or by fitting the projectile with stabilizing planes or a tail. The automatic rotation of projectiles is due to the suction produced by the systematic formation of vortices behind the extremity of the projectile moving with the wind.
Contributing Partner: UNT Libraries Government Documents Department
On the second-order tunnel-wall-constriction corrections in two-dimensional compressible flow

On the second-order tunnel-wall-constriction corrections in two-dimensional compressible flow

Date: April 1, 1951
Creator: Klunker, E Bernard & Harder, Keith C
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On the shear strength of skin-stiffener panels with inspection cut-outs

On the shear strength of skin-stiffener panels with inspection cut-outs

Date: March 1, 1945
Creator: Diskin, Simon H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On the small-disturbance iteration method for the flow of a compressible fluid with application to a parabolic cylinder

On the small-disturbance iteration method for the flow of a compressible fluid with application to a parabolic cylinder

Date: January 1, 1955
Creator: Kaplan, Carl
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On the sound field of a point-shaped sound source in uniform translatory motion

On the sound field of a point-shaped sound source in uniform translatory motion

Date: April 1, 1954
Creator: Honl, H
Description: A rigorous analysis presented of the excitation of sound by point sources moving in uniform translatory motion at subsonic or supersonic velocities through a two- or three-dimensional medium at rest. The construction of surfaces of constant phase is based upon Huyghens' principle in such a manner that the propagation in the medium at rest of the elementary waves emanating from the sound source is independent of the momentary state of motion of the sound source. Hence, characteristic traits of the sound propagation may be understood even on the basis of simple geometric constructions.
Contributing Partner: UNT Libraries Government Documents Department
On the Sound Field of a Rotating Propeller

On the Sound Field of a Rotating Propeller

Date: October 1, 1948
Creator: Gutin, L.
Description: The sound field of a rotating propeller is teated theoretically on the basis of aerodynamic principles. For the lower harmonics, the directional characteristics and the radiated sound energy are determined and are in conformity with existing experimental results.
Contributing Partner: UNT Libraries Government Documents Department
On the spectrum of isotropic turbulence

On the spectrum of isotropic turbulence

Date: November 1, 1951
Creator: Liepmann, H W; Laufer, J & Liepmann, Kate
Description: None
Contributing Partner: UNT Libraries Government Documents Department