摘要
为了解决航天器运动部件润滑失效的问题,将按需喷墨打印技术(DOD)应用于空间机构的润滑油主动补充系统.通过运用CFD-ACE数值仿真软件,结合计算流体力学(CFD)的理论和流体体积算法(VOF)中的分段线性界面重构技术(PLIC),对油滴从收缩型喷嘴(锥角约为43°)中形成到喷射进入稀薄大气中的过程进行气液两相流体的仿真分析.在相同的驱动电压条件下,分别对粘度,表面张力,以及喷嘴直径对油滴喷射行为的影响进行分析;提出油滴的体积等效计算方法.仿真数据和图像分析表明:此喷嘴结构,随着粘度的增加,油滴的喷出速度减小,体积也减小;随着表面张力的增加,油滴的喷出速度减小,体积增大.合理选择喷嘴直径是油滴能否有效喷出的关键因素.
To solve the problem of lubrication failure of MMA in aerospace,drop-on-demand technology（DOD） was applied to the lubricating oil active complement system for space mechanisms.Using the simulation software of CFD-ACE,combining the computational fluid dynamics theory with the volume-of-fluid method along with the piecewise linear interface construction technique,injection process simulation that the liquid injecting into the thin air from a contracting nozzle was carried out.Experiments were conducted to determine droplet ejection characteristics by systematically varying viscosity,surface tension of liquids and diameter of the nozzle under the same pulse voltage applied condition.A new method of calculating equivalent volume of oil droplets was proposed.Simulations reveal that with viscosity increasing,the speed of oil droplets ejected decreases,the volume also decreases;with surface tension increasing,the speed of oil droplets ejected decreases,the volume increases.The proper selection of nozzle diameter is the crucial factor for the ejection of lubricating oil.
出处
《哈尔滨理工大学学报》
CAS
北大核心
2011年第1期57-63,共7页
Journal of Harbin University of Science and Technology
基金
国家自然科学基金(50875057)
