摘要
工艺系统热工水力管路中的各类阀门、文丘里管、孔板等节流件,随系统工作压力和前后压差的增大,会出现汽液两相流引起空化。本文针对不同规格孔板为代表的节流件,采用流体力学仿真、结合台架实验产生的空化汽泡图像对比分析,提出阻塞流发展变化的斜梯三角形特性曲线。该曲线描述了流体通过节流件时,在不同工况下处于空化初生、临界、阻塞流、闪蒸4个不同流动状态。并给出了利用压力恢复系数或振动加速度信号作为空化初生点的判断依据。
Various valves,Venturi tubes,orifice plates in the thermal hydraulic pipelines of the process system will cause cavitation due to the increase of the working pressure of the system and the pressure difference between the front and back.Aiming at the throttling parts represented by different specifications of orifice plates,this paper uses fluid mechanics simulation,combines with the comparative analysis of the cavitation bubble images produced by the bench test,and proposes the oblique ladder triangle characteristic curve of the development and change of the blocked flow.This curve describes the four different flow states of the fluid under different working conditions,namely,initial cavitation,critical flow,blocked flow,and flashing when passing through the throttle.The basis for judging the initial point of cavitation by using pressure recovery coefficient or vibration acceleration signal is given.
作者
陈艳宇
尚群立
吴欣
俞轲鑫
CHEN Yanyu;SHANG Qunli;WU Xin;YU Kexin(School of Information Engineering,Zhejiang University of Technology,Hangzhou 310012;School of Mechanical Engineering,Hangzhou University of Electronic Science and Technology,Hangzhou 310018)
出处
《高技术通讯》
CAS
2022年第6期632-639,共8页
Chinese High Technology Letters
基金
国家科技重大专项(2018ZX06005002)资助项目。
