【摘要】 为研究液体发射药迫击炮内弹道特性,搭建60 mm液体发射药迫击炮瞬态测试系统,对其燃烧室压力变化与迫击炮弹初速进行测试。在试验基础上,基于非定常欧拉-拉格朗日模型和液体发射药蒸发-燃烧模型建立带燃烧反应的液体发射药迫击炮两相流计算模型,对内弹道过程中的反应流场进行模拟,分析复杂气相流场与液体发射药喷射燃烧间的耦合关系及压力振荡形成机理。结果表明:60 mm液体发射药迫击炮燃烧稳定性好,具有工程化潜力;数值模拟与试验结果吻合度较高,且可以复现压力振荡现象,计算模型具有合理性;液体发射药的喷射与燃烧均受燃烧室内气涡的影响;反射波引发的液体发射药集中燃烧使压力表现为一种振荡发展。更多还原

【Abstract】 In order to explore the interior ballistic characteristics of liquid propellant mortar,a 60 mm liquid propellant mortar transient measurement system was developed to measure the pressure in combustion chamber and the muzzle velocity of mortar shell. Based on the experiment,a two-phase flow model with combustion reaction for liquid propellant mortar is established by using unsteady EulerianLagrangian model and liquid propellant evaporation-combustion model. The coupling relationship between the complex gas phase flow field and the injection-combustion of liquid propellant as well as the formation mechanism of pressure oscillations are analyzed by simulating the reaction flow field during the interior ballistic process. The results show that the 60 mm liquid propellant mortar has excellent combustion stability. The numerically simulated results are in good agreement with the experimental results,where the experimental pressure oscillation is repeated,proving that the established model is reasonable and reliable. Both injection and combustion of liquid propellant are affected by gas vortex in combustion chamber. The concentrated combustion caused by the reflected waves makes the pressure appear as an oscillatory development.更多还原