Numerical Study On Aerodynamic Characteristics Of Rockets With Multiple Structure Of Wings

Fin-stabilized is a way for most rockets with large aspect ratio to keep stable flight.The aerodynamic characteristics of rockets with different structure wings are quite different.It is of great significance to study the aerodynamic characteristics of rockets with different structure of wings in different flight states.In this paper,the aerodynamic characteristics of four-wrap-around fins,six-wrap-around fins and six-flat fins in different flight states are studied,and the differences of their outflow field characteristics are analyzed.The specific work is as follows:(1)This paper established three structure of wings rockets physical model,and do the necessary simplification of the model,draw the rocket flow field after a grid computing domain,respectively for hree structure of wings rockets flow field simulation calculation,the rocket aerodynamic characteristics under different flight state and flow field characteristics differences,the results showed that: Under the condition of no rotation,the lift characteristics of six-wraparound wings fins is better than four-wrap-around wings fins at transonic and supersonic speeds,and the six-wrap-around wings fins rocket has lower drag coefficient,higher stability and more backward pressure center,but the lateral force and moment coefficients of s six-wraparound wings fins are also higher.Compared with flat wings fin,wrap-around wings fin has higher lift coefficient,lower resistance and higher stability,but the wrap-around wings fin has the reversal of rolling moment.(2)The Moving Reference Frame model is used to simulate the static aerodynamic characteristics of three structure of wings rockets,and the influence of rotation on their aerodynamic characteristics is studied.The results show that rotation has little effect on the drag coefficient,but has a great effect on the lift characteristics.The rotation speed increases and the lift coefficient dereases,which is particularly obvious when the rocket flies at low speed;At the same time,rotation also has a great influence on other aerodynamic parameters,and the effects of rotation on rockets with different tail forms are different.(3)The dynamic aerodynamic characteristics of three structure of wings rockets under different flight states are studied.The rolling damping dynamic derivative and pitch combined dynamic derivative are solved,and the differences of dynamic aerodynamic characteristics of three structure of wings rockets are compared.The results show that the dynamic derivatives of the pitch combination increase with the increase of Mach number and Angle of attack,and the dynamic stability increases.Adding the wrap-around wings make the rolling control of WrapAround fin more difficult,and the roll control of flat-wings fin is easier than that of wraparound-wings fin.