The Analysis Of Grid-fin Canard And The Application Of Grid-fin Canard To Trajectory Correction Mortar

With the development of military high-tech technologies,the uncontrolled projectiles cannot meet the military requirements of the modern battlefield.The precision guided projectiles appears.But it is difficult to use a large number of equipment because of the expensive price.Compared to precision guided munitions,trajectory correction projectiles has the advantages of low cost,can be equipped with a large number.Meanwhile,trajectory correction fuze to complete the trajectory correction can maximize the use of warhead space.Trajectory correction fuze technology has been paid high attention by the related weapon and equipment development department at home and abroad.With the increasing requirement of firing accuracy,how to further improve the correction capability of trajectory correction fuze has become a research hotspot.Based on target trajectory correction fuze,this paper proposes a new circular grid-fin canard with a fixed angle.This structure can achieve a single channel control twodimensional trajectory correction,and at the same time,it has better correction ability than the planar canard.With the terminal correction mortar as platform,this paper compares the aerodynamic characteristics of grid-fin canard trajectory correction mortar and planar canard trajectory correction mortar.The influence of the fixed angle and the number of spreading rudder on the aerodynamic characteristics of the trajectory correction mortar is studied,and the optimal fixed angle and the number of the spreading rudder are given.Based on computational fluid dynamics numerical simulation and particle trajectory simulation,the influence of grid wall thickness and grid profile shape on the drag reduction of the grid-fin and the range change is analyzed,the results show that the drag force decreases with the decrease of the thickness of the grid wall,and the diamond shape profile is more appropriate,when the processing technology can meet the requirements.Finally,the aerodynamic characteristics of trajectory correction mortar with grid-fin canard with different rolling attitude are simulated,and the drag characteristics,lift characteristics and yaw moment characteristics of different roll attitude are obtained.The lifting coefficient and yawing moment coefficient with rolling angle are fitted.Based on the simulation results,two key structure parameters of grid-fin canard were studied in this paper,the drag reduction optimization of the grid-fin canard is carried out.And this paper gives the aerodynamic coefficient fitting formula of the grid-fin canard trajectory correction mortar with different roll attitude.It provides support for the subsequent ballistic control research and experiments.