Analysis And Simulation Of Aerodynamic Parameter Of Controllable Bullet On FLUENT

With the rapid development of modern guiding technology，the guided weapon based onthe technology of microelectronics, computer and photoelectric conversion plays anincreasingly important role in modern warfare. So far, guided bombs, guided missiles, guidedbombs have been successfully developed at home and abroad. These weapons have adoptedthe precision guidance technology, which can change the projectile’s direction, attitude,altitude and speed according some certain rules and lead the projectile strike the long rangetarget with high-precision. The character of precision guided weapon is high precision, highcombat effectiveness, long range and etc. After integrated and miniaturized, this guidingtechnology can be mounted on a small caliber bullets and make the bullet’s flight trajectorybecome controllable. Common projectile uses the gyro stabilization causing by projectile’shigh speed rotation in the process of flying, on the contrary, the controllable bullet uses thetail fin to remain stable. The controllable bullet not only has the advantage of guided weapon,it also can reduce the projectile’s manufacture and expriment cost because of the bullet had asmall caliber. Based on existing precision guidance technology, this article firstly designed themodel of controllable bullet, and then described the principle of projectile’s flight-controltechnology. Furthermore, by using projectile’s traditional theoretical aerodynamic formula,we obtained the bullet’s theoretical aerodynamic parameters. Thirdly, we complete thesimulation of the aerodynamic parameters of controllable bullet on FLUENT. Using the resultof simulation, we analyses the controllable bullet’s aerodynamic parameter and verified thevalidity of the FLUENT numerical simulation method on simulating the projectile’s aerodynamic parameters. In addition, the flying stability has been analyzed. Finally, aftercalculating the air force and air torque of the bullet during flying process, we used ADAMS tosimulate the bullet’s(the tail fins with and without rotation) flight path. By comparing thesimulation results, we make a conclusion about the projectile tail’s deflection can lead to theflight path deflection of the projectile. Therefore, this paper completed the following work:1. The configuration of controllable bullet has been introduced in a systemic way. Then thecontrol principles of this bullet have been fully elaborated. The principles about optical sensorcollecting the light signal and tail’s fins controllability have been explained.2. The fin stabilized projectile’s traditional theoretical aerodynamic formula has beenprovided. The bullet’s body coefficient, tail fin coefficient and aerodynamic coefficientsinterference between the wing and the wing, and body and wing have been calculated andobtained the result.3. The principles and process of simulation on FLUENT have been fully explained. Analyzingthe feasibility of using FLUENT simulate bullet’s aerodynamic parameters. The theoreticalprinciple and method about the projectile’s aerodynamic parameter simulation on FLUENThave been successfully prepared.4. Bu using the result of simulation, we verified that validity of the FLUENT numericalsimulation method on simulating the projectile’s aerodynamic parameters. Through Analyzingabout the controllable bullet which had a special shape and configuration, we can get thebullet’s aerodynamic parameter‘s line. Due to the different length of the bullet’s nose, we cancompare the different between the two controllable bullets and draw a conclusion about howto optimize the shape and configuration of the bullet.5. Based on the simulation results, the bullet’s static stability and dynamic stability can beanalyzed.After analyzing the result, the stability of this controllable bullet can be verified.6. By using the simulation results, the air force and air torque which act on the controllablebullet can be calculated and analyzed. Then we can load these force and torque on the bulletin ADAMS to simulate the bullet’s exterior ballistics. Through rotating the tail fin with certaindegree, exterior ballistics of bullet will be different. This verified that the projectile tail’s deflection can lead to the flight path deflection of the projectile.