| 本文已被：浏览 1051次 下载 679次 |
码上扫一扫！ |
|
|
| ADN基推力器热回浸对毛细管微尺度流动特性影响的数值模拟研究 |
|
刘旭辉1,2,虞育松3,付拓取1,2,张伟1,2,高晨光1,2,刘瀛龙1,2,沈岩1,2,陈君1,2,王梦1,2
|
|
1.北京控制工程研究所 先进空间推进技术实验室，北京 100190;2.北京市高效能及绿色宇航推进工程技术研究中心，北京 100190;3.北京交通大学 机械与电子控制工程学院，北京;100044
|
|
| 摘要: |
| 小推力ADN基推力器在工作中，其毛细管内的推进剂容易在壁面传热作用下发生相变，进而影响推力器的正常工作。为了深入理解推进剂在毛细管内的相变和流动特性，采用三维数值模拟方法对毛细管微尺度流动和相变特性进行计算。计算考虑了毛细管与喷注器内的流固耦合传热、推进剂相变过程。推进剂相变采用Lee模型，气液体积分数的求解和气液界面捕捉重构采用VOF-CSF方法。本文首次采用VOF模型耦合Lee相变模型计算了ADN基推进剂在毛细管内的相变过程，并结合气泡空间分布仿真结果得到了质量流量和热回浸温度对流动特性的影响规律。计算结果显示，受到ADN基推进剂的冷却作用，毛细管内壁面温度要略低于外表面。毛细管内的气泡形成于弯管处，其体积沿着毛细管轴向下游逐渐增加，采取散热措施可减少并推迟气泡的形成。随着ADN基推进剂质量流量的降低或下游热回浸温度的增加，毛细管内的气泡均显著增加，且形成区域更接近上游区域。当热回浸温度从800K增加至1100K时，毛细管内的气泡体积从25.6mm3增加至58.7mm3。 |
| 关键词: ADN基推进剂 微尺度两相流动 热回浸 相变 流固传热 |
| DOI：10.13675/j.cnki. tjjs. 190017 |
| 分类号:V430 |
| 基金项目:“十三五”民用航天项目；北京控制工程研究所先进空间推进技术实验室和北京市高效能及绿色宇航推进工程技术研究中心开放基金（LabASP-2017-16）。 |
|
| Numerical Simulation of Effects of Heat Soak-Back onMicro-Scale Flow Through a Capillary inADN-Based Thruster |
|
LIU Xu-hui1,2,YU Yu-song3,FU Tuo-qu1,2,ZHANG Wei1,2,GAO Chen-guang1,2,LIU Ying-long1,2,SHEN Yan1,2,CHEN Jun1,2,WANG Meng1,2
|
|
1.Advanced Space Propulsion Laboratory，Beijing Institute of Control Engineering,Beijing 100190,China;2.Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology，Beijing 100190,China;3.School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China
|
| Abstract: |
| During operation of a small thrust force ADN based thruster, liquid ADN based propellant flowing through a metal capillary commonly undergoes phasechange due to the heat transfer between solid wall and fluid, which can affect the normal operation of the thruster. In this study, 3D CFD method was used to understand the phase change and flow processes in the capillary. The detailed model and methods involved a coupled method for solid/fluid steady heat transfer calculations, the Lee model for liquid-vapor phase transitions, VOF-CSF model for the two-phase volume fraction calculations and surface capture and reconstruction. In this study, the VOF model coupled with Lee model was used to simulate the phase change of the ADN based propellant in the capillary for the first time, and the effects of mass flow rate and the heat soak-back on the flow characteristics were discussed according to the calculated bubble spatial distribution. The results revealed that the temperature on the inner wall of the capillary was slightly lower than that of the outer surface because of the cooling effect of ADN-based propellant. The vapor bubbles formed at the curved section of the transported and grew along the downstream direction of the capillary. The formation processes of bubbles could be impeded and delayed by using the cooling method. With decreasing of the mass flow rate of ADN based propellant or increasing of the temperature due to heat soak-back, the bubble in the capillary increased significantly, and the forming region of bubbles was closer to the upstream region. When the temperature due to heat soak-back increased from 800K to 1100K, the bubble volume in the capillary increased from 25.6mm3 to 58.7mm3. |
| Key words: ADN based propellant Micro-scale two-phase flow Heat soak-back Phase change Fluid-solid heat transfer |
