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