内置进气式粉末供给装置高压流化输送特性的数值分析  

Numerical study on powder fluidization and conveying characteristics of powder supply device with built-in intake under high-pressure

作　　者：任冠龙 孙海俊[1] 徐义华[1] 胡晓安 李超[2] REN Guanlong;SUN Haijun;XU Yihua;HU Xiaoan;LI Chao(School of Aircraft Engineering,Jiangxi Key Lab.of Micro Aero-engine,Nanchang Hangkong University,Nanchang 330063,China;Unmanned System Research Institute,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]南昌航空大学飞行器工程学院江西省微小航空发动机重点实验室,南昌330063 [2]西北工业大学无人系统技术研究院,西安710072

出　　处：《航空动力学报》2024年第8期185-200,共16页Journal of Aerospace Power

基　　金：国家自然科学基金(12102161);航空科学基金(20200001056001)。

摘　　要：针对粉末发动机中活塞驱动式燃料供给系统,设计了一种内置进气式供粉装置。基于欧拉-欧拉双流体模型,通过用户自定义函数实现活塞运动,建立了气体-粉末-活塞相互作用计算模型,开展了不同储箱内初始工作压力(0.6、1.2、1.8、2.4、3.0、3.6 MPa)对粉末燃料供给特性的数值研究。结果表明:不同初始工作压力下的气固分界面主要在进气口附近波动。随初始工作压力增大,粉末流量波动幅度降低,稳定输送阶段内的平均粉末流量更接近理论值,粉末层(粉末体积分数为0.1)面积波动幅度降低;在两相喷管喉道截面,固相平均体积分数随初始工作压力增大而增大,但拟颗粒温度的波动幅度随之减小。初始工作压力为3.6 MPa时的储箱内压力相比0.6 MPa能维持更长时间稳定,压力波动幅度降低了59.1%。A powder feeding device with a built-in intake channel was designed for the piston-driven powder fuel supply system in powder engines,the piston movement was realized by using the User Defined Function(UDF),and the action of the coupling of the gas-powder-piston was established.Numerical simulation was carried out to investigate the powder fuel supply characteristics under different initial operating pressures(0.6,1.2,1.8,2.4,3.0 and 3.6 MPa) in the powder storage tank based on the Eulerian-Eulerian two-fluid model.The results showed that the gas-solid interface mainly fluctuated around the intake under different initial operating pressures.With the increase of the initial operating pressure,the fluctuation amplitude of the powder flow rate decreased,the mean powder flow rate within the stable conveying stage was closer to the theoretical value,and the fluctuation amplitude of the powder layer(powder volume fraction of 0.1) area decreased;the area-averaged volume fraction of solid phase at the two-phase nozzle throat section increased with the increase of the initial operating pressure in the storage tank,but the fluctuation amplitude of the granular temperature decreased.The pressure in the storage tank at an initial operating pressure of 3.6 MPa was kept stable for a longer period compared with0.6 MPa,and the pressure fluctuation in the storage tank was reduced by 59.1%.

关 键 词：粉末发动机 高压流化输送 双流体模型 内置进气结构 气固两相流动 活塞式供粉装置 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]