摘要
通过自主设计搭建纹影系统和气流发生器,获取了非接触观测不同流量的气体喷流时的流场演化图像,实时展现了流场演化过程中的诸多细节,结合Tracker软件图像分析和COMSOL有限元模拟,定量测量了气体的喷流速度,研究了气体喷流时的动态演化规律。研究结果发现,空气阻力对气体的喷流速度有较大的影响,在空气阻力的作用下喷流速度初始时刻会迅速衰减,随后缓慢减小并随时间演化出现一定的涨落;还发现气柱内压和空气阻力会导致气柱明显加宽,随着喷流速度的增加气柱加宽现象更加明显,进而阐明了实验结果与理想情况下理论计算存在差异,并且随着气体流量增加,这一差异更加明显的原因。
The schlieren system and gas jet generator were designed and built independently to observe the evolution images of the flow field of gas jets under different flow rates and show many details of the evolution process in real time without contact.The jet velocity was quantitatively measured and dynamic evolution law was researched with Tracker image analysis and COMSOL finite element simulation.The results show that the air resistance has a great influence on the jet velocity,and the jet velocity decays rapidly at the beginning,then decreases slowly and fluctuates to a certain extent with time evolution.It is also found that the internal pressure and air resistance of the gas column cause the air column to widen,and the widening phenomenon becomes more obvious with the increase of the jet velocity,which clarifies the reason why the difference between the experimental results and the theoretical calculations under ideal conditions rise gradually as the gas flow rate increases.
作者
张津硕
刘丰琦
柳鸿运
刘升光
李会杏
ZHANG Jinshuo;LIU Fengqi;LIU Hongyun;LIU Shengguang;LI Huixing(National Demonstration Center for Experimental Physics Education,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《实验室研究与探索》
CAS
北大核心
2022年第1期28-32,共5页
Research and Exploration In Laboratory
基金
教育部办公厅第二批新工科研究与实践项目(E-SXWLHXLX20202605)
大连市科技创新基金项目(2021JJ13FG98)。
关键词
纹影成像
喷流速度
气流发生器
schlieren imaging
jet velocity
gas jet generator
