Application Research of Flow Control Using Co-flow Jet on a Vertical Tail

Abstract

The aerodynamic characteristics of the vertical tail of an aircraft are directly related to the size and weight of the vertical tail. Increasing the lift force of the vertical tail using flow control can further reduce the size of the vertical tail,which is of practical significance for reducing the weight of the structure. The computational fluid dynamics(CFD)method is used to perform the numerical simulation for the active flow control of vertical tail using the co-flow jet technique. The influence law of jet momentum coefficient on continuous co-flow jet and the influence law of jet momentum coefficient and the paramaters of jet momentum coefficient,blockage ratio,injection hole number on discrete co-flow jet are studied. The results show that for the continuous co-flow jet,with the increase of jet momentum coefficient,the effectiveness of lift enhancement,drag reduction and separation suppression becomes more significant. For the discrete co-flow jet,the effectiveness of lift enhancement gradually decreases with the increase of the blockage ratio,and the power consumption also decreases at the same time. With the increase of the discrete hole number,the lift enhancement effect first increases and then decreases,and the comprehensive aerodynamic efficiency considering energy consumption is improved.

Keywords

• vertical tail
• co-flow jet
• discrete co-flow jet
• jet momentum coefficient
• blockage ratio
• injection hole number