摘要
预混合磨料水射流喷嘴作为射流切割系统的执行端,细微的截面形状改变都会对喷嘴性能产生较大的影响。为提高喷嘴的综合性能(切割能力和使用寿命),本文运用计算流体力学软件对流体动力学方程和磨粒受力方程等进行耦合求解,研究在以峰值流速(切割能力)和单位流量冲蚀率对数(使用寿命)为指标的前提下,各类喷嘴性能的综合表现。以单锥、衔接型、凹型和凸型4类喷嘴为模型,分析不同收缩段截面形状对喷嘴综合性能的影响;结果表明:凹型和衔接型喷嘴综合性能接近,优于单锥喷嘴,凸型喷嘴综合性能最差;较大的收缩段夹角不利于喷嘴综合性能的提升;在以上分析结果的基础上,设计了圆弧过渡的平直型喷嘴,仿真结果显示:具有圆弧过渡的平直型喷嘴在综合性能上有了较大的提升。本文工作为后续的喷嘴截面形状优化提供了参考。
The premixed abrasive water jet nozzle,as an executive end of a jet cutting system,can have a significant impact on the nozzle performance due to subtle cross-sectional shape changes.To improve the overall performance(cutting ability and service life)of nozzles,the fluid dynamics and force equations of abrasive particles are coupled and solved using the computational fluid dynamics software to study the overall performance of various types of nozzles by considering the peak flow rate(cutting capacity)and the logarithm of the erosion rate per unit flow rate(service life)as indicators.The effects of various cross-section shapes of the contraction section on the overall performance of the nozzle are analyzed using four nozzle type models:single cone,joint,concave,and convex.The results show that the overall performance of concave and connecting nozzles is almost identical and is superior to that of single cone nozzles,whereas the comprehensive performance of convex nozzles is the worst.Furthermore,results indicated that a larger angle between the contraction sections does not help to improve the overall nozzle performance;finally,a flat nozzle with circular arc transition is designed based on the above analysis results.The simulation results show that a flat nozzle with a circular arc transition can significantly improve the comprehensive performance.This research work forms a reference for the subsequent optimization of the nozzle cross-section shape.
作者
李智博
姚绍明
王立权
运飞宏
南亦博
LI Zhibo;YAO Shaoming;WANG Liquan;YUN Feihong;NAN Yibo(College of Mechanical and Electrical Engineering,Harbin Engineering University,Harbin 150001,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2023年第6期1011-1018,共8页
Journal of Harbin Engineering University
基金
中国博士后科学基金项目(2020M670889)
黑龙江省自然科学基金(LH2021E046)
国家自然科学基金项目(52001089)
中央高校基本科研业务费专项基金项目(3072021CFT0701)。
关键词
预混合磨料水射流喷嘴
截面形状
综合性能
峰值流速
单位流量冲蚀率对数
衔接型喷嘴
圆弧过渡
平直型喷嘴
premixed abrasive water jet nozzle
section shape
comprehensive performance
peak velocity
logarithm of erosion rate per unit flow
connecting nozzle
arc transition
flat nozzle
