METHOD FOR EASILY EVALUATING DRAG OF MODEL RECEIVING AERODYNAMIC LIFT IN MAGNETIC SUSPENSION AND BALANCE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a technique capable of rationally evaluating aerodynamic forces by substantially improving the efficiency of wind tunnel test and simultaneously eliminating such waste that both a model suspension device and a mechanical balance device, which should not have been required for a wind tunnel provided with a magnetic suspension and balance system, should be separately provided.;SOLUTION: In a method for easily evaluating drag of a model receiving aerodynamic lift in a magnetic suspension and balance system, a known external force in a horizontal direction is provided for the model in a state on which lift is not acting to determine the relation of a drag coil current balancing the horizontal external force. A rate of change (B) of the drag coil current to changes in the horizontal external force is quantitatively evaluated on the basis of the relation. The relation between the drag coil current (I_drag) and attitude angles (θ) when the attitude angle of the model is changed without providing any external force except gravity is determined. Drag (D) when lift (L) is acting is evaluated on the basis of gravity (mg) acting on the model on the basis of a proposed equation.;COPYRIGHT: (C)2009,JPO&INPIT