底排点火具在高降压速率下瞬态燃烧特性的实验研究

为了研究底排点火具在弹丸出炮口时瞬态燃烧特性及工作性能,采用半密闭爆发器模拟炮口压力突降过程,借助高速录像系统,开展了高降压速率条件下底排点火具燃烧特性的实验研究。结果表明,在高速降压过程中,底排点火具燃烧受到强烈瞬态扰动。不同药剂的点火具抗干扰性能不同,其中以硝酸钡为药剂主成分的点火具和以镁粉 PTFE为药剂主成分的点火具燃烧性能稳定,以氢化锆、二氧化铅为药剂主成分的点火具工作稳定性较差,火焰持续时间标准差为523 m s,点火具喷孔堵塞严重。

Transient Combustion Performance of Igniter for Base Bleed Unit Under Rapid Depressurization

To study the transient combustion performance of igniter for base bleed unit under rapid depressurization,a semi-closed bomb and a high speed digital video camera were used to simulate and record the combustion phenomena.Results show that the combustion of igniter is disturbed violently by the rapid depressurization.The anti-jamming ability of igniter depends on the charge in the igniter.The combustion of the igniter charged with barium nitrate and those charged with magnesium powder and PTFE is stable,while the igniter charged with zirconium hydride and lead oxide is unstable.The standard error of duration of the third kind of igniter flame is 523 ms,and also its nozzle hole is blocked seriously.