Abstract
This paper presents a discrete adjoint-based aerodynamic optimization algorithm for helicopter rotor blades in hover using a Non-Linear Frequency Domain approach. The procedure to be used can be broken down into two phases: first, investigate and develop an accurate inviscid numerical model for the current generation of helicopter rotor blades; and second, demonstrate the approach for the redesign of a transonic Caradonna–Tung two-bladed rotor. The results in determining the optimum aerodynamic configurations require an objective function which minimizes the inviscid torque coefficient and maintains the desired thrust level at transonic conditions.
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