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 Collection: Technical Report Archive and Image Library
Theories of flow similitude

Theories of flow similitude

Date: January 1, 1929
Creator: Zahm, A F
Description: The laws of comparison of dynamically similar fluid motions are derived by three different methods based on the same principle and yielding the same or equivalent formulas. This report outlines the three current methods of comparing dynamically similar motions, more especially of fluids, initiated respectively by Newton, Stokes (or Helmholtz), and Rayleigh. These three methods, viz., the integral, the differential, and the dimensional, are enough alike to be studied profitably together. They are treated in succession then compared. (author).
Contributing Partner: UNT Libraries Government Documents Department
The theories of turbulence

The theories of turbulence

Date: October 1, 1955
Creator: Bass, J
Description: The theory of turbulence reached its full growth at the end of the 19th century as a result of the work by Boussinesq and Reynolds. It then underwent a long period of stagnation which ended under the impulse given to it by the development of wind tunnels caused by the needs of aviation. Numerous researchers, attempted to put Reynolds' elementary statistical theory into a more precise form. During the war, some isolated scientists - von Weizsacker and Heisenberg in Germany, Kolmogoroff in Russia, Onsager in the U.S.A. - started a program of research. By a system of assumptions which make it possible to approach the structure of turbulence in well-defined limiting conditions quantitatively, they obtained a certain number of laws on the correlations and the spectrum. Since the late reports have improved the mathematical language of turbulence, it was deemed advisable to start with a detailed account of the mathematical methods applicable to turbulence, inspired at first by the work of the French school, above all for the basic principles, then the work of the foreigners, above all for the theory of the spectrum.
Contributing Partner: UNT Libraries Government Documents Department
Theory and apparatus for measurement of emissivity for radiative cooling  of hypersonic aircraft with data for Inconel and Inconel X

Theory and apparatus for measurement of emissivity for radiative cooling of hypersonic aircraft with data for Inconel and Inconel X

Date: October 1, 1957
Creator: O'Sullivan, William J , Jr
Description: The importance of radiation as a means of cooling high-supersonic- and hypersonic-speed aircraft is discussed to show the need for measurements of the total hemispherical emissivity of surfaces. The theory underlying the measurement of the total hemispherical emissivity of surfaces is presented, readily duplicable apparatus for performing the measurements is described, and measurements for stably oxidized Inconel and Inconel X are given for the temperature range from 600 F to 2,000 F.
Contributing Partner: UNT Libraries Government Documents Department
Theory and application of hot-wire instruments in the investigation of turbulent boundary layers

Theory and application of hot-wire instruments in the investigation of turbulent boundary layers

Date: March 1, 1946
Creator: Klebanoff, P S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Theory and design of a pneumatic temperature probe and experimental results obtained in a high-temperature gas stream

Theory and design of a pneumatic temperature probe and experimental results obtained in a high-temperature gas stream

Date: January 1, 1957
Creator: Simmons, Frederick S
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Theory and experiments on supersonic air-to-air ejectors.

Theory and experiments on supersonic air-to-air ejectors.

Date: January 1, 1958
Creator: Fabri, J
Description: A comparison of experiment with theory is made for air ejectors having cylindrical mixing sections and operating under conditions of supersonic primary flow and either mixed or supersonic regimes of mixing. The effect on ejector performance of such parameters as mixer length and cross section, terminating diffuser, primary Mach number, and primary nozzle position is presented in terms of mass flow and pressure ratio.
Contributing Partner: UNT Libraries Government Documents Department
A theory and method for applying interferometry to the measurement of certain two-dimensional gaseous density fields

A theory and method for applying interferometry to the measurement of certain two-dimensional gaseous density fields

Date: April 1, 1952
Creator: Howes, Walton L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Theory and Methods of Optical Pyrometry

Theory and Methods of Optical Pyrometry

Date: March 1, 1962
Creator: Kostkowski, H. J.
Description: Report reviewing the theoretical methods of optical pyrometry and the application of these methods at the National Bureau of Standards in realizing, maintaining and distributing the International Practical Temperature Scale above 1063 ÂșC is presented. In the theoretical presentation, the concepts of effective and mean effective wavelengths are introduced, and various equations relating these parameters to each other and other physical quantities are derived. The methods presentation discusses important features of precision visual optical pyrometers, experimental procedures, and results of primary and secondary calibrations of optical pyrometers.
Contributing Partner: UNT Libraries Government Documents Department
Theory and preliminary flight tests of an all-movable vertical tail surface

Theory and preliminary flight tests of an all-movable vertical tail surface

Date: January 1, 1943
Creator: Kleckner, Harold F
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Theory and procedure for determining loads and motions in chine-immersed hydrodynamic impacts of prismatic bodies

Theory and procedure for determining loads and motions in chine-immersed hydrodynamic impacts of prismatic bodies

Date: January 1, 1953
Creator: Schnitzer, Emanuel
Description: A theoretical method is derived for the determination of the motions and loads during chine-immersed water landings of prismatic bodies. This method makes use of a variation of two-dimensional deflected water mass over the complete range of immersion, modified by a correction for three-dimensional flow. Equations are simplified through omission of the term proportional to the acceleration of the deflected mass for use in calculation of loads on hulls having moderate and heavy beam loading. The effects of water rise at the keel are included in these equations. In order to make a direct comparison of theory with experiment, a modification of the equations was made to include the effect of finite test-carriage mass. A simple method of computation which can be applied without reading the body of this report is presented as an appendix along with the required theoretical plots for determination of loads and motions in chine-immersed landings.
Contributing Partner: UNT Libraries Government Documents Department