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首页> 外文期刊>Defence science journal >Coefficient of Drag and Trajectory Simulation of 130 mm Supersonic Artillery Shell with Recovery Plug or Fuze
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Coefficient of Drag and Trajectory Simulation of 130 mm Supersonic Artillery Shell with Recovery Plug or Fuze

机译：130毫米超音速炮弹的阻力和轨迹模拟系数，恢复插头或引信

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In the present study, the drag variation and trajectory elements estimation of a supersonic projectile having two different nose shapes are made numerically. The study aims at finding the coefficient of drag and shock wave pattern for 130 mm artillery shell fitted with recovery plug or with fuze, when travelling at zero angle of attack in a supersonic flow of air. The coefficient of drag (CD) obtained from the simulation is used as an input parameter for estimation of trajectory elements. The numerical results, i.e., the coefficient of drag at different Mach numbers and trajectory elements are validated with the data recorded by tracking radar from an experimental firing. Based on numerical results and data recorded in experimental firing, the coefficient of drag in the case of the shell with recovery plug is 2.7 times more than for the shell with fuze. The shock wave in the case of the shell with recovery plug is detached bow shock wave, whereas in the case of a shell with fuze, the shock is attached. The results indicate that the coefficient of drag increases with detached shock wave and an increase in the radius of the shell nose. Good agreements were observed between numerical results and experimental observations. Defence Science Journal, Vol. 64, No. 6, November 2014, pp.502-508, DOI:http://dx.doi.org/10.14429/dsj.64.8110
机译：在本研究中，在数值上制造具有两个不同鼻形状的超音速射弹的抗变化和轨迹元件估计。该研究旨在找到130 mm炮壳的阻力和冲击波图案系数，其装有回收塞或引信时，以超声波空气流动的零攻角行进。从模拟中获得的拖动系数（CD）用作估计轨迹元素的输入参数。数值结果，即不同马赫数和轨迹元件的拖动系数被通过跟踪雷达从实验射击记录的数据验证。基于实验烧制中记录的数值结果和数据，在壳体的情况下，带回收插头的情况下的拖动系数比外壳与引信的壳体增加2.7倍。带回收塞的壳体的冲击波是分离的弓形冲击波，而在带有引信的壳的情况下，震动附加。结果表明，阻力系数随着拆卸的冲击波而增加，并且壳体鼻径的半径增加。数值结果和实验观察之间观察到良好的协议。国防科学期刊，卷。 64，2014年11月6日，PP.502-508，DOI：http：//dx.doi.org/10.14429/dsj.64.8110

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