延期药延期时间的p-t曲线测试新方法

A New p-t Curve Test Method for Delay Time of Delay Composition

利用测压组件、高压电弧点火器、压力变送器、示波器等建立了一种新型的、适用于延期药燃速测试的p-t曲线测试系统。利用高压电弧点火器在金属针与延期体金属管壳间产生电弧,点燃延期体;用示波器记录燃烧过程中测压组件内部的p-t曲线,通过适当的取点,得到延期药的燃烧时间。分别用p-t曲线法和光电法测试了秒级及毫秒级延期体的延期时间,并对所得结果进行了对比。对于秒级延期体,光电法、p-t曲线法测试后计算得到的延期精度分别为3.35%、3.43%;对于毫秒级延期体,光电法、p-t曲线法测试后计算得到的延期精度分别为12.21%、18.96%。结果表明:该p-t曲线测试系统应用于秒级、毫秒级延期药延期时间的测试是可行的,体现延期体的真实燃烧状态,满足高低温下延期体测试的保温需求。

A new p-t curve recording system for testing the burning rate testing of delay composition is established by using pressure measuring component,high voltage arc igniter,pressure transmitter,oscilloscope,et al.Arc generated between metal needle and extension body metal tube shell of high voltage arc igniter ignites extension body,and an-oscilloscope records p-t curve of pressure measuring component during combustion process,and the burning time of delay composition was obtained by taking appropriate points.The delay time of second-level and millisecond-level extension body were measured by p-t curve method and photoelectric method respectively,and the results were compared.The delay accuracy of second-level extension body calculated are 3.35%and 3.43%by photoelectric method and p-t curve method.The delay accuracy of millisecond-level extension body are 12.21%and 18.96%calculated by photoelectric method and p-t curve method respectively.The results show that the p-t curve test system is feasible for the test of the delay time of the second-level and millisecond-level delay composition.It can reflect the real combustion state of the extension body,and meet the thermal insulation need of the extension body test at high and low temperatures.