| The lateral force of slender body at high angle of attack flying is an important research direction in the field of fluid mechanics.While at high angle of attack,due to the roughness of the head and other some reasons,the asymmetric vortices will be formed at the leeward area of the head,and this is the main reason for the lateral force.The asymmetric vortex system is very sensitive to the small disturbance from the head.So,applying small disturbance can achieve the purpose of controlling the asymmetric vortex flow,which is in order to control the lateral force.This paper carried out research on oscillating jet actuator,and the research is studied by computational means.The flow characteristics and deflection characteristics of the oscillating jet actuator are related to some physical quantities.In this paper,the effects of the splitting,the angle,the control port position on the deflection and the flow characteristics are demonstrated in detail.Which lay the foundation for the application of plasma jet oscillation actuator.In this paper,blowing holes are arranged on both sides of the head on the leeward area of the slender body,and oscillating jet is applied in these holes.In the early stage of the experiment,the saymmetric vortices were studied,and the relationship between the asymmetric vortex and the angle of attack and the relationship between asymmetric vortex and the flow velocity were discussed.In the open-loop experiment the influence of and the relationship between the frequency of the oscillating jet and the lateral force are discussed in detail.The correlation between the frequency of the oscillating jet and the lateral force is obtained.And on the basis of open loop control,the closed-loop control circuit is designed.The pressure signal is fed back to the controller through the sensor,and then the lateral force is automatically controlled.This experiment provides a practical engineering control technology for fighters and tactical missiles. |
PDF Full Text Request