三波点的测量与实验技术研究

Test of Triple Point and Study on its Test Technology

为研究爆炸冲击波传播过程中三波点的轨迹和在三波点上下不同位置测量结果的区别以及与在地面测量冲击波压力的关系,采用在不同高度布放自由场压力传感器,测量了炸药爆炸的冲击波超压,试验研究了三波点的高度。在相应位置的地面放置壁面压力传感器,得到相同测量位置处地面冲击波的压力参数及在距地面一定高度爆炸的三波点轨迹。对比分析了两种测量方法的相对标准差,得到不同测量方法对测量不确定度的影响。结果表明,用自由场压力传感器在三波点上方的测量精度较后者高。

To investigate the track of triple point in the process of explosive shock wave propagation, the distinction of testing results at different heights, and its relationship with the testing result of blast wave overpressure on the ground, the blast overpressure with certain height of blast was measured by using the free- field blast pressure “pencil” sensor at different heights and its triple point height was studied experimentally. The shock wave overpressure on the same testing position and the track of triple point with certain blast height were acquired by using the wall pressure sensor. The effect of measurement uncertainty from the different test method were acquired by analyzing the relative standard deviation of results by free-field blast pressure “pencil” sensor and wall pressure sensor. The results show that the measurement accuracy of the former is better than that of the latter.