微装药空腔能量传递的数值模拟与试验研究

为研究微通道装药(微装药)空腔能量传递的影响因素,采用数值模拟和实验测试方法得到了空腔衰减压力.用AUTODYN软件的点火增长模型描述微装药的非理想爆轰过程,计算了不同装药尺寸、空腔厚度和约束材料的输出压力,并与锰铜压阻计的测试结果进行对比.结果表明,数值计算与试验值的偏差在10%以内,说明数值模拟方法可用于微通道空腔压力衰减研究.微装药直径越大或空腔厚度越小,压力越大,45#钢比有机玻璃约束更有利于空腔能量的传递.

Numerical Simulation and Experiment Study of the Energy Transfer in Micro-Channel Charge with Air Interlayer

In order to study the energy transfer process at the interface of micro-channel charge and air gap, numerical simulation and experiments were implemented to achieve the pressure attenuated by the air gap. The commercial software AUTODYN was employed to simulate the non-ideal detonation process which was described by ignition and growth model. The peak pressures under different charge diameter, gap thickness and confinement material were obtained by numerical computation. Then, the obtained data was compared with that from measurement with Manganin piezo-resistance meter. The comparison result shows that the error is less than 10%, which verifies the numerical simulation would be a useful way to study the micro-channel charge problem. It is easy to see that the larger of the charge diameter or the thinner of the gap size the higher of the pressure. The 45^# steel is a much better confinement material than PMMA (polymethyl methacrylate) for air gap energy transfer.