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High-Altitude Cooling 6: Axial-Flow Fans and Cooling Power

Description: Report presenting the theory, design, and effect on cooling of the constant-velocity axial-flow fan as related to the problem of high-altitude aircraft engine cooling. The existing theory of the axial-flow fan, including a discussion of the fan losses, is summarized.
Date: September 1944
Creator: Mutterperl, William
Partner: UNT Libraries Government Documents Department

The Conformal Transformation of an Airfoil Into a Straight Line and Its Application to the Inverse Problem of Airfoil Theory

Description: "A method of conformal transformation is developed that maps an airfoil into a straight line, the line being chosen as the extended chord line of the airfoil. The mapping is accomplished by operating directly with the airfoil ordinates. The absence of any preliminary transformation is found to shorten the work substantially over that of previous methods. Use is made of the superposition of solutions to obtain a rigorous counterpart of the approximate methods of thin-airfoils theory" (p. 1).
Date: December 1944
Creator: Mutterperl, William
Partner: UNT Libraries Government Documents Department

A Solution of the Direct and Inverse Potential Problems for Arbitrary Cascades of Airfoils

Description: Methods are given of determining the potential flow plast an arbitrary cascade of airfoils and the inverse problem of determining an airfoil having a prescribed velocity distribution in cascade. Results indicated that Cartesian mapping function method may be satisfactorily extended to include cascades. Numerical calculation for computing cascades by Cartesian mapping function method is considerably greater than for single airfoils but much less than hitherto required for cascades.
Date: December 1944
Creator: Mutterperl, William
Partner: UNT Libraries Government Documents Department