红外照相机的热浮法湍射流流态转捩机理探究  

Exploration of Transition Mechanism of Flow State of Turbulent Jet Using Thermal Floatation Method Using Infrared Cameras

作　　者：陈水桥[1] 王鲲[1] CHEN Shuiqiao;WANG Kun(School of Physics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学物理学院,杭州310027

出　　处：《实验室研究与探索》2024年第6期50-54,83,共6页Research and Exploration In Laboratory

摘　　要：为了探究湍射流3种流动状态的转捩机理,设计并搭建了可控式湍射流实验仪,利用热浮法红外拍摄了3种流态,实现了湍射流的可视化及精确测量。通过实验观察和分析了包络态中流体转捩速度与雷诺数的关系,确定了转捩临界雷诺数大小范围,并推导和验证了涡环态中推进力与流体流速的半经验公式;同时通过颜色仿真展示了喷口截面处的压强分布图像;利用网格剖分的方式分析了涡环转捩机理,完善了流体运动过程的精细测量,为实验室测量雷诺数提供了一种可行方法。In order to explore the transition mechanism of three flow states of turbulent jet,a controllable turbulent jet experimental instrument is designed and constructed.Three flow states are captured using the thermal float method,achieving visualization and accurate measurement of turbulent jet.The relationship between fluid transition velocity and Reynolds number in envelope state is observed and analyzed through experiments,and the range of critical Reynolds number for transition is determined,providing a feasible method for measuring Reynolds number in the laboratory.The semi empirical formulas for propulsion force and fluid velocity in vortex ring state are derived and verified.At the same time,the pressure distribution image at the nozzle section is displayed through color simulation method.The mechanism of vortex ring transition is analyzed using grid meshing,which improves the precise measurement and analysis of fluid motion process.

关 键 词：热浮法 包络态 涡环态 湍流态 红外照相机 

分 类 号：O423[理学—声学]