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On a new method for calculating the potential flow past a body of revolution

On a new method for calculating the potential flow past a body of revolution

Date: July 1, 1942
Creator: Kaplan, Carl
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On a new method for calculating the potential flow past a body of revolution

On a new method for calculating the potential flow past a body of revolution

Date: January 1, 1943
Creator: Kaplan, Carl
Description: A new method is presented for obtaining the velocity potential of the flow about a body of revolution moving uniformly in the direction of its axis of symmetry in a fluid otherwise at rest. This method is based essentially on the fact that the form of the differential equation for the velocity potential is invariant with regard to conformal transformation of the meridian plane. By means of the conformal transformation of the meridian profile into a circle a system of orthogonal curvilinear coordinates is obtained, the main feature of which is that one of the coordinate lines is the meridian profile itself. The use of this type of coordinate system yields a simple expression of the boundary condition at the surface of the solid and leads to a rational process of iteration for the solution of the differential equation for the velocity potential. It is shown that the velocity potential for an arbitrary body of revolution may be expressed in terms of universal functions which, although not normal, are obtainable by means of simple quadratures. The general results are applied to a body of revolution obtained by revolving a symmetrical Joukowski profile about its axis of symmetry. A numerical example ...
Contributing Partner: UNT Libraries Government Documents Department
On a new type of wind tunnel

On a new type of wind tunnel

Date: May 1, 1921
Creator: Munk, Max
Description: Discussed here is a new type of wind tunnel, its advantages, the difficulties attendant upon its use, and the special methods required for its operation. The main difference between the new type of wind tunnel and the ones now in operation is the use of a different fluid. The idea is to diminish the effect of viscosity If air is compressed, it becomes a fluid with new properties - a fluid that is best suited for reliable and exact tests on models. When air is compressed, its density increases, but its viscosity does not. It is argued that the increase of pressure greatly increases the range and value of wind tunnel tests. Reynolds number, deductions from the Reynolds law, the causes of errors that result in differences between tests on models and actual flights, and the dimensions of a compressed air wind tunnel are covered.
Contributing Partner: UNT Libraries Government Documents Department
On a solution of the nonlinear differential equation for transonic flow past a wave-shaped wall

On a solution of the nonlinear differential equation for transonic flow past a wave-shaped wall

Date: January 1, 1952
Creator: Kaplan, Carl
Description: The Prandtl-Busemann small-perturbation method is utilized to obtain the flow of a compressible fluid past an infinitely long wave-shaped wall. When the essential assumption for transonic flow (that all Mach numbers in the region of flow are nearly unity) is introduced, the expression for the velocity potential takes the form of a power series in the transonic similarity parameter. On the basis of this form of the solution, an attempt is made to solve the nonlinear differential equation for transonic flow past the wavy wall. The analysis utilized exhibits clearly the difficulties inherent in nonlinear-flow problems.
Contributing Partner: UNT Libraries Government Documents Department
On atomization in carburetors

On atomization in carburetors

Date: October 1, 1931
Creator: Scheubel, F N
Description: The outstanding quantity of the whole atomization problem is the characteristic K, and therefore the ratio of the static pressure of the air stream with respect to the liquid to the surface tension of the liquid. The higher its value, the better the atomization. The shape of the Venturi tube plays a secondary role. The increase of section beyond the throat had best not be too abrupt.
Contributing Partner: UNT Libraries Government Documents Department
On boattail bodies of revolution having minimum wave drag

On boattail bodies of revolution having minimum wave drag

Date: January 1, 1956
Creator: Harder, Keith C & Rennemann, Conrad, Jr
Description: The problem of determining the shape of slender boattail bodies of revolution for minimum wave drag has been reexamined. It was found that minimum solutions for Ward's slender-body drag equation can exist only for the restricted class of bodies for which the rate of change of cross-sectional area at the base is zero. In order to eliminate this restriction, certain higher order terms must be retained in the drag equation and isoperimetric relations. The minimum problem for the isoperimetric conditions of given length, volume, and base area is treated as an example. According to Ward's drag equation, the resulting body shapes have slightly less drag than those determined by previous investigators.
Contributing Partner: UNT Libraries Government Documents Department
On boattail bodies revolution having minimum wave drag

On boattail bodies revolution having minimum wave drag

Date: August 1, 1955
Creator: Harder, Keith C & Rennemann, Conrad, Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On Combustion in a Turbulent Flow

On Combustion in a Turbulent Flow

Date: February 1, 1947
Creator: Shelkin, K. I.
Description: The characteristics introduced by the turbulence in the process of the flame propagation are considered. On the basis of geometrical and dimensional considerations an expression is obtained for the velocity of the flame propagation in a flow of large scale of turbulence.
Contributing Partner: UNT Libraries Government Documents Department
On compressibility corrections for subsonic flow over bodies of revolution

On compressibility corrections for subsonic flow over bodies of revolution

Date: February 1, 1949
Creator: Reissner, Eric
Description: None
Contributing Partner: UNT Libraries Government Documents Department
On floats and float tests

On floats and float tests

Date: September 1, 1931
Creator: Seewald, Friedrich
Description: The principal source of information on float resistance is the model test. In view of the insuperable difficulties opposing any attempt at theoretical treatment of the resistance problem, particularly at attitudes which tend toward satisfactory take-off, such as the transitory stage to planing, the towing test is and will remain the primary method for some time.
Contributing Partner: UNT Libraries Government Documents Department