Application of theoretical design methods to the study of performance limits of airfoils in cascade.
Jenista, John E.
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A method of designing airfoils in cascade by means of conformal transformations is discussed. Design of these airfoils is regulated by five independent input parameters, with solutions obtained by digital computer., A large number of cascades generated by this method are compared. To evaluate the limits of performance, a parameter to indicate the tendency toward flow separation is introduced, with a limiting value established and verified. Proper solidity is shown to be of great importance in achieving low values of this separation parameter. The value of proper solidity for a given blade thickness is shown to be relatively independent of fairing shape. To increase performance, reducing blade thickness with a corresponding increase in solidity is shown to yield much greater improvement than changes in fairing shape.
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