发射药膛内两种燃速测试方法的比较

Two Methods to Test Gun Propellant Burning Rate in Gun Chamber

为了研究发射药在火炮膛内的燃烧规律，以经典内弹道理论为基础，从理论上分析了常规测试和微波测试的可行性，并建立了相关的计算处理方法。常规测试方法和微波测试方法分别采用P—t曲线、炮口初速和v—t曲线作为基础数据，经相关计算得到发射药膛内燃速。试验结果表明，理论计算P—t曲线和试验P—t曲线能够较好地吻合，在80～250MPa压力范围内，常规测试和微波测试所测燃速范围分别为17～29cm·S-1。和8～23cm·S-1。发射药在膛内的燃速关系式偏离指数式较远，微波测试方法的准确性在一定程度上要高于常规测试方法。

In order to study the burning rules of gun propellant in gun chamber,feasibility of microwave interferometer testing and ordinary testing was analyzed based on the classical interior ballistic theory, and a relative calculation method was proposed. p-t curves and muzzle velocity were considered as basic data by the ordinary testing method, however v-t curves was considered as basic data by the microwave interferometer testing method. The burning rate of gun propellant in gun chamber could be obtained by both methods. Results show that the calculated p-tcurves are consistent with the p-t curves of testing. Under pressure between 80 MPa and 250 MPa,the range of burning rate is between 17 cm·S-1 and 29 cm·S-1 by ordinary testing method,and under pressure between 80 MPa and 250 MPa,the range between 8 cm·S-1 and 23 cm·S-1 by microwave interferometer testing method. The formula of gun propellant burning rate in gun chamber deviates far from the exponential function. The precision of microwave interferometer testing method is better than that of ordinary testing method.