The New Interpretation of the Laws of Air Resistance

The New Interpretation of the Laws of Air Resistance

Date: April 1, 1923
Creator: Prandtl, L
Description: A closer examination of Newton's formula for air resistance shows that it is well to consider the air as an ordinary fluid, and, indeed for most of the velocities considered, as a non-compressible fluid, so long as the dimensions of the moving body are large in comparison with the mean free path of the particles of air.
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Turbulent flow

Turbulent flow

Date: October 1, 1927
Creator: Prandtl, L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effects of streamline curvature on lift of biplanes

Effects of streamline curvature on lift of biplanes

Date: June 1, 1927
Creator: Prandtl, L
Description: This report concerns, first, the determination of the lift of a wing which is situated in a curvilinear flow; and second, to calculate the curvature which one wing of a biplane produces in the vicinity of the other.
Contributing Partner: UNT Libraries Government Documents Department
Effect of stabilizing forces on turbulence

Effect of stabilizing forces on turbulence

Date: June 1, 1931
Creator: PRANDTL L
Description: The appearance of expressed discontinuity layers in the free atmosphere, where a warm air mass flows over a cold mass without perceptible intermingling forms the basis of the present report. In these experiments an air stream is to be blown between a water-cooled and a vapor-heated plate. According to what preceded it is anticipated that the exchange will be enhanced. Because these experiments had to be made at relatively low air speeds so as to let the lifting forces become effective, it first required a study of the test methods, and so we have not yet proceeded beyond the preliminary tests on the most suitable hot-wire connections and thermocouples for recording speed and temperature.
Contributing Partner: UNT Libraries Government Documents Department
General considerations on the flow of compressible fluids

General considerations on the flow of compressible fluids

Date: September 1, 1936
Creator: Prandtl, L
Description: This paper presents an introduction to the subject of the flow of compressible media. Historical development and hydraulics are omitted.
Contributing Partner: UNT Libraries Government Documents Department
Attaining a steady air stream in wind tunnels

Attaining a steady air stream in wind tunnels

Date: October 1, 1933
Creator: Prandtl, L
Description: Many experimental arrangements of varying kind involve the problems of assuring a large, steady air stream both as to volume and to time. For this reason a separate discussion of the methods by which this is achieved should prove of particular interest. Motors and blades receive special attention and a review of existent wind tunnels is also provided.
Contributing Partner: UNT Libraries Government Documents Department
Note on the calculation of boundary layers

Note on the calculation of boundary layers

Date: November 1, 1940
Creator: Prandtl, L
Description: The properties of the solutions of the hydrodynamic equations of viscous fluid by "boundary-layer omission" are discussed. A method is indicated for the numerical determination of the solution for a known initial profile u(x(sub o),y) and pressure distribution p(x) within the region.
Contributing Partner: UNT Libraries Government Documents Department
Recent work on airfoil theory

Recent work on airfoil theory

Date: December 1, 1940
Creator: Prandtl, L
Description: The basic ideas of a new method for treating the problem of the airfoil are presented, and a review is given of the problems thus far computed for incompressible and supersonic flows. Test results are reported for the airfoil of circular plan form and the results are shown to agree well with the theory. As a supplement, a theory based on the older methods is presented for the rectangular of small aspect ratio.
Contributing Partner: UNT Libraries Government Documents Department
Recent results of turbulence research

Recent results of turbulence research

Date: August 1, 1933
Creator: Prandtl, L
Description: The first sections of this report deal with two prominent questions, namely the origin of turbulence and the characteristics of turbulent currents. In the third section conclusions are drawn for the flow along a rough wall, whereby an important relation for the velocity distribution is revealed. The principles are also applied to straight rough and smooth tubes.
Contributing Partner: UNT Libraries Government Documents Department
Lessons of the 1922 Rhon soaring flights

Lessons of the 1922 Rhon soaring flights

Date: February 1, 1923
Creator: Prandtl, L
Description: Innovations in design and technique from the Rhon soaring contest are presented in this report.
Contributing Partner: UNT Libraries Government Documents Department
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