Application of theoretical design methods to the study of performance limits of airfoils in cascade.

摘要

A method of designing airfoils in cascade by means ofconformal transformations is discussed. Design of these airfoilsis regulated by five independent input parameters, withsolutions obtained by digital computer., A large number ofcascades generated by this method are compared. To evaluatethe limits of performance, a parameter to indicate the tendencytoward flow separation is introduced, with a limitingvalue established and verified. Proper solidity is shown tobe of great importance in achieving low values of this separationparameter. The value of proper solidity for a givenblade thickness is shown to be relatively independent of fairing shape. To increase performance, reducing blade thicknesswith a corresponding increase in solidity is shown toyield much greater improvement than changes in fairing shape.