战术导弹固体火箭发动机补偿垫点火冲击动态过程的实验研究

Experimental study on compensating shim of tactical missile SRM in ignition impulsion

补偿垫是自由装填式固体火箭发动机（SRM）中的一个重要部件。基于X射线实时荧屏分析系统（RTR）,对战术导弹固体火箭发动机内补偿垫在点火冲击作用下的动态运动过程进行了实时监测,利用MATLAB软件对截取的连续图像进行了增强、滤波处理,并提取边界,获得补偿垫压缩及反弹过程。结果表明,补偿垫最大压缩量达到42.2%,平均压缩速率为514.9 mm/s,平均反弹速率为44.4 mm/s;压缩量在37.0%~42.2%之间存在一个临界值,大于临界值时,补偿垫弹性模量急剧升高。研究结果可为药柱及包覆层的力学性能设计提供参考。

Compensating shim is an important part of freely loaded solid rocket motor（SRM）.Based on X-ray real-time radiography technique（RTR）,dynamic process of compensating shim in ignition impulsion was observed.A series of continuous photographs captured from RTR system were all processed by means of image-enhancement technique and filtering technique using MATLAB,and boundaries of the processed photographs were all picked up.Then the compressing process and rebounding process could be gotten.Results show that the maximum compressibility of compensating shim is 42.2%,average compressing rate is 514.9 mm/s and average rebounding rate is 44.4 mm/s.There is a critical compressibility between 37.0% and 42.2%,and elastic modulus of the compensating shim will increase rapidly when compressibility is bigger than the critical value.Results of the study can be used as a reference for the mechanical property design of grain and inhibitor.