| 摘要: |
| 粉末燃料供应系统是实现粉末冲压发动机流量调节的最关键技术，供应系统的优劣直接影响发动机性能，也是需要解决的主要问题之一。本文运用欧拉连续介质方法对粉末燃料典型流化装置流量调节对流化的影响进行研究，探究流量调节过程中等固气比调节对流化的影响，分析粉末在存储罐、流化区域、出口管路上的分布规律。通过分析等固气比调节的输出粉末质量流量变化规律、粉末分布、罐体气相压降判断粉末流化效果的优劣，进而完成粉末燃料典型流化装置流量调节对流化影响的研究。结果表明，随着输入粉末质量流量的增大，粉末供应到达稳定供应状态的时长逐渐减小；输入粉末平均质量流通量在12 732.4~16 976.5 kg/（m2·s）的设计工况，到达稳定供应状态需要的时间短，是较为理想的输入粉末质量流量的设计工况；粉末燃料供应系统为欠阻尼系统，供应系统开机后推力增加的过程中，阻尼振荡频率随着输出粉末质量流量的增大而增大；在到达稳定前，流化区域形成的旋流影响范围先增大再变小后保持稳定（或者消失），旋流具有稳定粉末供应的作用。 |
| 关键词: 粉末冲压发动机 金属粉末燃料 气固两相流 欧拉法 流化 燃料供应系统 气力输送 |
| DOI：10.13675/j.cnki.tjjs.2209059 |
| 分类号:V19 |
| 基金项目:湖南省重点研发计划项目（2021GK2011；2023GK2022）。 |
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| Effects of flow regulation on fluidization of powder fuel typical fluidization unit |
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LIAO Jun1, XIA Kunxiong1, SONG Jiawen1, LUO Shibin1,2, XU Dequan2, FENG Yanbin2
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1.Research Institute of Aerospace Technology,Central South University,Changsha 410083,China;2.School of Automation,Central South University,Changsha 410083,China
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| Abstract: |
| The supply system of powder fuel is the key technology for the flow regulation of powder ramjet engines. The quality of the supply system directly affects the performance of the engine， which is also one of the main problems to be solved. Therefore， in this paper， the Eulerian continuous medium method was used to research the influence of flow regulation on the fluidization of powder fuel typical fluidization unit， explore the influence of equal solid-gas ratio regulation on fluidization of flow regulation process， and analyze the distribution of powder in storage tank， fluidization region and output pipe. The powder fluidization effect was judged by analyzing the variation rule of powder mass flow rate， powder distribution and tank gas pressure drop under the regulation of equal solid-gas ratio. Thus， the effects of flow regulation on fluidization in typical fluidization unit of powder fuel were studied. The results indicate that with the increase of the output powder mass flow rate， the time for powder supply to reach a stable supply state gradually decreases. The design condition of average mass flux of powder between 12 732.4~16 976.5 kg/（m2·s） requires a short time to reach the stable supply state， which is an ideal design condition. The powder fuel supply system is an under damped system， and the damping oscillation frequency increases with the increase of the output powder mass flow rate when the thrust increases after the powder supply system is started. Before attaining the stability， the influence region of the swirl flow formed in the fluidization region initially increases and then declines， and then remains stable （or disappears）， and the swirl flow has the function of stabilizing the powder supply. |
| Key words: Powder ramjet engine Metal powder fuel Gas-solid two-phase flows Eulerian method Fluidization Fuel supply system Pneumatic conveying |
