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375
Preliminary Study of Stability of Flow From Two Ducts Discharging Into a Common Duct
Note presenting an investigation of the instability of flow from two ducts that join into a common duct and of the influence of the various parameters on the phenomenon. A two-dimensional potential analysis was carried out under the assumption that the two ducts discharge into a region of constant pressure.
Date:
July 1951
Creator:
Bellin, Albert I.; Messina, D. Richard & Richards, Paul B.
System:
The UNT Digital Library
An Investigation of Aircraft Heaters 35: Thermocouple Conduction Error Observed in Measuring Surface Temperatures
Note presenting experimental results that verify an analysis of errors occurring when thermocouples are used to measure the temperature of surfaces exposed at temperatures different from that of the surface. The data indicate that the electrical insulation of the wires is not effective in reducing the errors involved when the thermocouples are placed normal to the surface and exposed to the ambient fluids.
Date:
July 1951
Creator:
Boelter, L. M. K. & Lockhart, R. W.
System:
The UNT Digital Library
Analytical Investigation of Fully Developed Laminar Flow in Tubes With Heat Transfer With Fluid Properties Variable Along the Radius
"In the analytical investigation reported herein, which was conducted in the NACA Lewis laboratory, both velocity and temperature distribution are obtained for fully developed laminar flow in tubes of gases and of liquid metals with variable fluid properties" (p. 1).
Date:
July 1951
Creator:
Deissler, Robert G.
System:
The UNT Digital Library
Theoretical study of some methods for increasing the smoothness of flight through rough air
Report presenting a theoretical study of the response to gusts and stability and control characteristics of an airplane equipped with systems in which wing flaps and elevators are operated to reduce accelerations in rough air. The surfaces are actuated by an automatic control system in response to indications of an angle-of-attack vane or accelerometer.
Date:
July 1951
Creator:
Phillips, William H. & Kraft, Christopher C., Jr.
System:
The UNT Digital Library
Summary of Methods for Calculating Dynamic Lateral Stability and Response and for Estimating Lateral Stability Derivatives
"A summary of methods for making dynamic lateral stability and response calculations and for estimating the aerodynamic stability derivatives required for use in these calculations is presented. The processes of performing calculations of the time histories of lateral motions, of the period and damping of these motions, and of the lateral stability boundaries are presented as a series of simple straightforward steps. Existing methods for estimating the stability derivatives are summarized and, in some cases, simple new empirical formulas are presented" (p. 1).
Date:
July 1951
Creator:
Campbell, John P. & McKinney, Marion O.
System:
The UNT Digital Library
Flight tests of experimental beveled-trailing-edge Frise ailerons on a fighter airplane
Report presenting flight measurements made to determine the characteristics of a pair of experimental ailerons designed to provide a close degree of balance and maintain a linear variation of aileron effectiveness with aileron angle through a large deflection range. Results regarding the small-deflection tests, large-deflection tests, effect of stretch on stick forces, and analysis of extended-span ailerons are provided.
Date:
July 1946
Creator:
Goranson, R. Fabian
System:
The UNT Digital Library
Improving the Performance of a Compression Ignition Engine by Directing Flow of Inlet Air
"The object of this report is to present the results of tests performed by the National Advisory Committee for Aeronautics to determine the effect on engine performance of directing the flow of the inlet air to a 5-inch by 7-inch cylinder, solid injection, compression ignition engine, After a few preliminary tests, comparative runs were made at a speed of 1500 r.p.m. with and without directed air flow. It was found that directing the flow of the inlet air toward the fuel injection valve gave steadier engine operation, and an appreciable increase in power, and decreased fuel consumption" (p. 1).
Date:
July 1926
Creator:
Kemper, Carlton
System:
The UNT Digital Library
Analysis of Square Shear Web Above Buckling Load
"A solution of Von Karman's fundamental equations for plates with large deflections is presented for the case of a shear web divided into square panels by reinforcing struts. Numerical solutions are given for struts of infinite rigidity and for struts the weight of which is one-fourth the weight of the sheet. The results are compared with Wagner's diagonal tension theory as extended by Kuhn and by Langhaar. It is found that the diagonal tension theory as developed by Kuhn agrees best with the present paper in the practical range when r=1/4. Kuhn's theory is in especially good agreement for the force in the strut when r=1/4" (p. 1).
Date:
July 1944
Creator:
Levy, Samuel; Fienup, Kenneth L. & Woolley, Ruth M.
System:
The UNT Digital Library
On the Circulatory Subsonic Flow of a Compressible Fluid Past a Circular Cylinder
"The circulatory subsonic flow around an infinite circular cylinder is computed using the linearized pressure-volume relation, by a method developed in a previous report. Formulas and graphs are given for the velocity and pressure distributions, the circulation, the lift, and the dependence of the critical Mach number upon the position of the stagnation point" (p. 1).
Date:
July 1945
Creator:
Bers, Lipman
System:
The UNT Digital Library
Graphical and Analytical Methods for the Determination of a Flow of a Compressible Fluid Around an Obstacle
"Chaplygin introduced the hodograph method in the theory of compressible fluid flows and developed a method for constructing stream functions of such flows. This method, which has been extensively used in investigation of compressible fluid flows, is limited in certain respects. The expression for the stream function obtained in this manner can represent only certain types of flow patterns. In general, flow patterns obtained in this way cannot represent the whole flow around an obstacle, but only a part of such a flow, and therefore several expressions are needed in order to obtain the whole flow" (p. 1).
Date:
July 1945
Creator:
Bergman, Stefan
System:
The UNT Digital Library
Comparison of Vee-Type and Conventional Tail Surfaces in Combination with Fuselage and Wing in the Variable-Density Tunnel
"The pitching and the yawing moments of a vee-type and a conventional type of tail surface were measured. The tests were made in the presence of a fuselage and a wing-fuselage combination in such a way as to determine the moments contributed by the tail surfaces" (p. 1).
Date:
July 1941
Creator:
Greenberg, Harry
System:
The UNT Digital Library
Principal Effects of Axial Load on Moment-Distribution Analysis of Rigid Structures
"This thesis presents the method of moment distribution modified to include the effect of axial load upon the bending moments. This modification makes it possible to analyze accurately complex structures, such as rigid fuselage trusses, that heretofore had to be analyzed by approximate formulas and empirical rules. The method is simple enough to be practicable even for complex structures, and it gives a means of analysis for continuous beams that is simpler than the extended three-moment equation now in common use" (p. 1).
Date:
July 1935
Creator:
James, Benjamin Wylie
System:
The UNT Digital Library
Aerodynamic Investigation of a Cup Anemometer
Results of an investigation wherein the change of the normal force coefficient with Reynolds Number was obtained statically for a 15.5-centimeter hemispherical cup.
Date:
July 1934
Creator:
Hubbard, John D. & Brescoll, George P.
System:
The UNT Digital Library
Charts for the Computation of Equilibrium Composition of Chemical Reactions in the Carbon-Hydrogen-Oxygen-Nitrogen System at Temperatures From 2000° to 5000° Degrees K
Charts are provided for the estimation and progressive adjustment of two independent variables on which the calculations are based. Additional charts are provided for the graphical calculation of the composition.
Date:
July 1948
Creator:
Huff, Vearl N. & Calvert, Clyde S.
System:
The UNT Digital Library
Considerations of the Total Drag of Supersonic Airfoil Sections
The results of calculations of the viscous and pressure drags of some two-dimensional supersonic airfoils at zero lift are presented. The results indicate that inclusion of viscous drag alters many previous results regarding the desirability of certain airfoil shapes for securing low drags at supersonic speeds. At certain Reynolds and Mach numbers, for instance, a circular-arc airfoil may theoretically have less drag than the previously advocated symmetrical wedge-shape profile; although under different conditions, the circular-arc airfoil may have a higher drag.
Date:
July 1947
Creator:
Ivey, H. Reese & Klunker, E. Bernard
System:
The UNT Digital Library