| Summary: | 碩士 === 國防大學理工學院 === 機械工程碩士班 === 105 === This paper combines computational fluid mechanics (CfD) method and Fortran trajectory simulation program to explore the aerodynamic characteristics and trajectory simulation of the new type 81 mm projectile in different type of fuze (4 control canard), flight conditions for 0.5~0.9 and 0.945 Ma, attack angle α between -5 ° ~ +5 °.
In the CFD simulation results show that under the same conditions (Mach number and angle of attack), as the warhead fuze increases 4 slices of duck rudder, the force area increases, so the drag coefficient and the lift coefficient are increased, in which Model B (Slope_Canard) is the largest.
The trajectory calculation is also used to carry out the trajectories at the 0.945M and 800 degree, the maximum range of Original is the farthest. The other maximum height to Original, model A (similar, the difference is only 1 meters) are the highest, mainly because the program is the main control parameters of resistance, but with a smaller resistance, in the bullet weight difference, can obtain a far range. The impact of maximum range between Original and model A is only 318meters (5.15%), so the 3 types of bomb can be seen in range is not far. It can continue to study the canard in different deflection and rotation conditions.Finally to find the establishment of the external Ballistic correction database, for development of two-dimensional ballistic correction fuze reference in the future.
This study establishes a set of fuze configuration aerodynamic design, flow field analysis ratio and flight trajectory simulation method to provide the database for the advance design and development of ballistic correction fuze, and saves the related cost of live ammunition test.
Key words: mortar, aerodynamic performance of fuze configurations, canard, computational fluid dynamics
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