In view of the fact that traditional liquid propellants cannot meet the design requirements of large-thrust flight vehicle, it has become a new trend to add nano-metal powder to liquid propellants to greatly increase density and specific impulse. In order to achieve the variable flow-rate and variable-proportion transportation of aviation fuel with nano-aluminum, a new type of solid-liquid mixing pumping system is designed, including powder conveying device, stirring device, pump and corresponding drive and transmission system. For the purpose of avoiding the frictional contact between the rotors, which will bring potential hazard to nano-aluminum powder, a non-contact twin-screw pump with synchronous gears is designed. Among them, based on the considerations of flow pulsation, volumetric efficiency and manufacturing difficulty, cycloid profile is adopted for screw rotors. After completing the functional design, geometric parameter design, structural design, 3D modeling, prototype manufacturing and preliminary performance estimation of the mixing pumping system, the performance of the screw feeder, agitator, screw pump was tested through experiments to meet the expected design requirements. The designed agitator can achieve sufficient mixing at 500 rpm in less than 10 s. Even though 50-micron clearances are designed with a relatively small rotor diameter, the volumetric efficiency of screw pump can reach above 50% when the discharge pressure is below 450 kPa and the flow rate is set as 10 L/min, the power of the screw pump is less than 700 W. This design facilitates the rapid real-time preparation of metallized propellants and provides a reference for further improving the design and control methods of nanoparticle two-phase flow pumping.

中文翻译：

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设计用于航空应用的纳米铝负载燃油泵

鉴于传统液体推进剂不能满足大推力飞行器的设计要求，在液体推进剂中加入纳米金属粉末以大幅提高密度和比冲成为新趋势。为实现纳米铝航空燃料的变流量、变比例输送，设计了一种新型的固液混合泵送系统，包括粉体输送装置、搅拌装置、泵及相应的驱动传动系统。 . 为避免转子之间的摩擦接触，给纳米铝粉带来潜在危害，设计了一种带同步齿轮的非接触式双螺杆泵。其中，基于流量脉动、容积效率和制造难度的考虑，螺杆转子采用摆线型材。在完成混合泵送系统的功能设计、几何参数设计、结构设计、3D建模、样机制造和初步性能评估后，通过实验对螺杆给料机、搅拌器、螺杆泵的性能进行测试，达到预期的设计要求。设计的搅拌器可以在不到 10 秒的时间内以 500 rpm 的速度实现充分混合。即使设计50微米的间隙，转子直径较小，但在排出压力低于450kPa，流量设定为10L/min时，螺杆泵的容积效率可达到50%以上，螺杆泵小于 700 W。