微爆轰推力器的冲量计算

轻型微爆轰推力器由许多装有微量含能材料的推力单元组成。文章利用瞬时爆轰假设以及小药量线性近似，假设推力单元内的微量含能材料的爆轰反应在瞬时完成，从理论上计算了微爆轰推力单元在真空中的冲量和推力；并在此基础上研究了含能材料的爆热、产物的等熵指数以及喷管长度对单元的冲量和推力的影响。研究结果表明，推力单元的冲量随装药质量、等熵指数和比爆热的增大而增加；为了获得理想的推进性能，喷管的长度不能小于装药长度的4倍。

Calculation for the Impulse of Micro-Detonation Thruster

The lightweight micro detonation thruster is consisted of a lot of thrust units containing tiny energetic material By using the instantaneous detonation assumption and the tiny charge mass linear approximation, the impulse and the thrust of a micro detonation thrust unit operating in vacuum are theoretically calculated in this paper Based on that, the influences of specific detonation heat, isentropic exponent and length of the nozzle on the impulse and the thrust are studied The results show that increasing the charge mass, the isentropic exponent and the specific detonation heat can enhance the impulse of a thrust unit, and the nozzle length must be 4 times or more of the charge length to achieve the perfect propulsion performance