喷射参数对扇形喷嘴雾化特性的影响  

Analysis of influencing factors on atomization characteristics of fan-shaped nozzle

作　　者：蒋小平[1,2] 王帅[1] 陈建华[1] 季静 朱朝佳 朱兴业[1] JIANG Xiaoping;WANG Shuai;CHEN Jianhua;JI Jing;ZHU Chaojia;ZHU Xingye(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;National Engineering and Technology Center for Information Agriculture,Nanjing Agricultural University,Nanjing,Jiangsu 210095,China;Wuxi Haisheng High-pressure Pump Co.,Ltd.,Wuxi,Jiangsu 214174,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]南京农业大学国家信息农业工程技术中心,江苏南京210095 [3]无锡海升高压泵有限公司,江苏无锡214174

出　　处：《排灌机械工程学报》2022年第10期1065-1071,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家重点研发计划项目(2017YFC0404204);江苏省重点研发计划项目(BE20211308,BE2019306,BE2017334);江苏省信息农业重点实验室开放基金资助项目(KLIAKF1802)。

摘　　要：针对扇形喷嘴雾化特性问题,在Ansys Fluent中基于Taylor Analogy Breakup(TAB)破碎模型,采用Eulerian-Lagrangian连续相与离散相耦合算法,实现了扇形喷嘴的液滴破碎、雾化形成及气液两相流场的非定常数值模拟,完成了喷射压力与喷雾高度2个参数对扇形喷嘴液滴速度、液滴直径、离散相模型(DPM)质量浓度、液滴通量N等雾化特性参数影响的研究,通过激光粒度仪在试验台上得到了液滴索特平均直径D_(SM),并与模拟结果进行了对比.研究结果表明:随着喷射压力的升高,液滴的速度越大,液滴在计算域内平均停留时间越短,在计算域停留的液滴数越少;液滴的索特平均直径D_(SM)、液滴体积中值直径D_(VM)、数量中值直径D_(NM)随着喷射压力的升高越来越小,喷射压力为0.3 MPa后液滴D_(SM)减小的趋势变大,这有利于改善实际作业中的雾化质量,当然在有风状态下也会加大雾滴飘逸的风险.喷雾高度对液滴D_(SM)影响不大.不同喷射压力下DPM质量浓度以及喷雾的覆盖面积不受喷射压力的影响,由于N的变化与液滴D_(SM)呈三次方,与覆盖面积A成反比关系,液滴的数量通量随着喷射压力的变大而逐渐变大.DPM的质量浓度随着喷雾高度的升高而逐渐降低,喷雾的覆盖面积随着喷雾高度的升高而逐渐变大.由于液滴的D_(SM)随喷雾高度的变化可忽略不计,因此液滴数量通量随着喷雾高度的增加而逐渐变小.不同喷射压力下和不同喷雾高度下试验和模拟计算所得到的D_(SM)变化趋势一致,整个过程的误差不超过10%.In order to solve the problem of atomization characteristics of fan-shaped nozzles,the coupling algorithm of Eulerian-Lagrangian continuous phase and discrete phase was adopted based on Taylor Analogy Breakup(TAB)model in Ansys Fluent.The fan-shaped nozzle droplet crushing,atomization formation and unsteady numerical simulation of gas-liquid two-phase flow field were realized.The research on the influence of the injection pressure and the two parameters on the fan-shaped nozzle spray height droplet velocity and droplet diameter,the discrete phase model(DPM)mass concentration,droplet flux N of atomization characteristic parameters were completed.Through the test bench to test the laser granulometer droplet sauter mean diameter D_(SM),the simulation results were compared.The results show that with the increase of injection pressure and droplet velocity,the average residence time of droplet in the computational domain is shorter,and the number of droplet in the computational domain is less.Droplet sauter mean diameter D_(SM),droplet size median diameter D_(VM),and number of median diameter D_(NM) with the increase of injection pressure are more and more small.After the injection pressure is 0.3 MPa,droplet D_(SM) decreases to larger diameter,which is beneficial to improve the quality in the actual operation of atomization.Under windy conditions,risk of escaping droplets will also increases.Spray height has little effect on droplet D_(SM).The DPM mass concentration and spray coverage area under different injection pressures are not affected by the injection pressure.Since the change of N is in inverse proportion to the cubic D_(SM) of droplet and the coverage area A,the quantity flux of droplet gradually increases with the increase of injection pressure.The mass concentration of DPM decreases gradually with the increase of spray height,and the spray coverage area increases gra-dually with the increase of spray height.As the D_(SM) of droplet changes with the spray height,the droplet number flux decreases with the inc

关 键 词：扇形喷嘴 雾化特性 液滴速度 液滴直径 液滴通量 离散相模型质量浓度 

分 类 号：TK734[交通运输工程—轮机工程]