端面效应对楔形罩切割器射流成型影响的试验和数值模拟

为了研究端面效应和装药长度对单角度楔形罩线型聚能切割器射流成型性能的影响特点和规律,运用ANSYS/LS-DYNA对方案进行了全尺寸三维数值模拟,并采用X光试验进行了成型照相,获得了不同时刻射流的成型图片。结果表明,X光试验和数值模拟获得的图像外形基本吻合,端面效应使得装药形成的射流质量和速度均有一定程度的下降; 在装药长度不同的条件下,端面效应对射流成型的影响也不同; 当装药长度小于20 mm时,基本不能形成射流; 当装药长度大于20 mm小于70 mm时,对于某一装药长度,形成的射流最大速度逐渐增大至某一固定水平,装药长度范围内可以形成较稳定的射流。为了尽量降低端面效应对射流成型的不利影响,装药长度需要大于70 mm。

Experimental and Three-dimensional Numerical Simulation for Influence of End Constraint on Jet Formation of Cuneiform Cover Cutter

In order to study the influences of end constraint and charge length on the jet formation of single angle cuneiform cover liner shaped charge(LSC) cutter, a three-dimensional full-scale model of charge was established by using ANSYS/LS-DYNA program. The jet formation photographs of different time was reorded by X-ray technique. Results show that the image shape of simulation almost is same with X-ray test. The jet mass and jet velocity were declined because of end constranint. The influence of end constranint on jet formation was different with different charge length. Jet can hardly form when the charge length was less than 20 mm. When the charge length was greater than 20 mm and less than 70 mm, a stable jet can form in charge length range and maximum jet velocity increased gradually to a certain level for a certain length of charge. To minimize the adverse effect of the end constranint on the jet formation, charge length should be greater than 70 mm.