【摘要】 随着航天技术的进步,航天任务复杂性的不断提高,对液体火箭发动机多次关机重启的要求日益普遍,相应地对推进剂管理系统的要求也越来越严格。关机滑行期间,贮箱内重力水平减弱,毛细力开始成为主导作用力,液体推进剂在毛细力的作用下可能脱离排液口,使得供给发动机的推进剂夹气,导致点火失败。为了确保发动机在经历自由滑行后能顺利重启,就必须考虑贮箱内气液界面如何响应重力和加速度水平改变的问题。针对常用构型和尺寸的空间贮箱,数值模拟了不同Bo数下气液界面波的传播,研究了不同Bo数下界面波传播的机制,发现了贮箱内界面波的传播速度随着Bo数的增加而增大,并得到Bo数从1～5000范围内描述界面波传播规律的Fr数与Bo数之间的标度关系。更多还原

【Abstract】 With the advancement of aerospace technology and the increasing complexity of space exploration missions, it is increasingly common to require multiple shutdowns and restarts of liquid rocket engines, and correspondingly, the requirements for propellant management systems are becoming increasingly rigorous. During shutdown coasting, the level of gravity in the reservoir decreases and capillary forces begin to dominate. The liquid propellant may break away from the discharge port under the capillary force, which allows the propellant supplied to the engine to entrap gas, resulting in ignition failure.To ensure that the engine can be restarted after experiencing free flight, it is necessary to consider how the gas-liquid interface inside the propellant tank responds to gravity and acceleration jumps. In this paper, the propagation of gas-liquid interfacial wave under different values of the Bond number is numerically simulated for commonly used configurations and sizes of space propellant tanks, and the mechanism of the propagation of interfacial wave under different values of the Bond number is investigated. Finally, It is found that the propagation velocity of interfacial waves in a storage tank increases with the Bond number, and the scaling law between the Froude number and the Bond number in the range of the Bo numbers from 1 to 5000 is obtained to characterize the propagation of interfacial wave.更多还原