大长径比中心炸管式抛撒定容阶段两相流模拟

针对中心炸管式抛撒系统的定容阶段点传火、抛撒药燃烧作用过程,建立了理论模型并对其进行了仿真计算。鉴于点传火管里无装药且长径比较大,建立了一维纯气相模型,针对燃烧室内抛撒药燃烧过程,建立二维轴对称两相流模型,并通过能量交换将二者耦合。采用CE/SE方法编制了内弹道计算程序并进行了仿真计算,仿真计算结果与试验结果基本一致,验证了该文所建立的数学模型及相应的数值方法的正确性。仿真结果分析表明:无装药且长径比大的点传火管点传火过程较慢,但点火一致性良好,能够均匀释放点火能量,保证燃烧室内火药燃烧过程平稳可靠。

子母弹中心炸管式抛撒定容阶段试验与仿真研究

为研究子母弹中心炸管式抛撒在中心点传火方式下流场的时空演化规律,进行了中心炸管式抛撒定容阶段的试验研究,建立了点传火管和中心管内的双二维轴对称两相流模型,对抛撒系统进行了网格划分。用二维CE/SE数值算法编写了内弹道程序,将仿真结果与试验结果进行对比,分析了流场压力分布特性和流场速度变化特性,验证了数理模型的有效性。结果分析表明,采用二维两相流模型对点传火过程进行计算较一维模型更加全面,对点传火管和中心管两相流流场时空变化特性描述更加准确,该研究结果对中心炸管式抛撒定容阶段的作用机理研究具有参考价值。

Design and theoretical analysis of test system for propellants' gas pressure in warhead

Aiming at harsh environment of cluster bombs center tube explosion dispersion and difficulties in installation of traditional test systems,a storage test system based on 16-bit ultra-low power microcontroller MSP430 is designed in order to acquire gas pressure during cluster bombs dispersion.To meet the requirement of low power consumption,the working states of system＇s modules during data acquisition are elaborated and the equation to calculate the gas pressure change during cylindrical center tube opening the hatch is deduced.The field test is conducted and good test results are obtained.