Simulation For Identification Of Flutter Derivatives For Aerofoil Using Forced Vibration Method And Its Application

Unsteady aerodynamic force model of Scanlan is imported to aerofoil's flutter calculation in this paper. A new method, coupled-forced-vibration method, for the identification of flutter derivatives of section of aerofoil is developed in this paper. The dynamic mesh technology of CFD is used to simulate the coupled-forced vibration and detached-forced vibration of the segmental model, and 2-D segmental model's eight flutter derivatives and 3-D segmental model's eighteen flutter derivatives are identified through calculation of its self-excited forces. The identification results of flutter derivatives are effected by the factor,such as Amplitude and frequency of forced vibration and viscosity of air are analyzed. At last, 2-D model, 3-D model and high aspect ratio aerofoil's flutter calculating methods are discussed by using flutter derivatives.