Synthesized airfoil data method for prediction of dynamic stall and unsteady airloadsThe synthesized unsteady airfoil data method, which accurately describes the unsteady aerodynamic characteristics of stalled airfoils in the time domain, is expanded and improved. Nine sets of unsteady drag data are synthesized, providing a basis for the successful expansion of the method to include the computation of unsteady pressure drag of airfoils and rotor blades. An improved prediction model for airfoil flow reattachment is incorporated into the method. Application of the model results in a better correlation of analytic predictions with measured full-scale helicopter blade loads and stress data. The results show that it is feasible to generalize the empirical parameters embedded in the method over a range of angles of attack, Mach number, airfoil shape, and sweep angle.
Document ID
19840063541
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gangwani, S. T. (United Technologies Research Center East Hartford, CT; Hughes Helicopters, Inc., Culver City, CA, United States)