自激振荡喷嘴流动特性对近嘴区射流雾化的影响  

Effect of fuel flow in self-excited oscillating nozzle onnear-nozzle region jet atomization

作　　者：高永强 周士谦 齐龙 尹迁齐 黄雪涛[1] 张佳兴 GAO Yong-qiang;ZHOU Shi-qian;QI Long;YIN Qian-qi;HUANG Xue-tao;ZHANG Jia-xing(School of Automotive Engineering,Shandong Jiaotong University,Jinan 250357,China)

机构地区：[1]山东交通学院汽车工程学院,济南250357

出　　处：《吉林大学学报（工学版）》2024年第6期1512-1518,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：山东交通学院博士启动基金项目(BS201901047)。

摘　　要：基于大涡模拟(LES)和流体体积分数法(VOF)模型,建立了自激振荡喷嘴流场的数学模型,仿真研究了自激振荡喷嘴内流动及射流破碎过程。结果表明:燃油流过自激振荡喷嘴能显著提高流体涡度和扰动强度,射流扰动强度的振荡幅值增大3倍多。射流扰动对近嘴区射流破碎的影响更加敏感,显著提高了射流破碎质量;近嘴区射流破碎距离(SL)明显减小,SL在距喷嘴出口(2~5)倍直径处变化;近嘴区喷雾锥角也随之增大,最大增幅超过60%,燃油雾化效果得到显著提高。本文计算结果可为自激振荡脉冲雾化喷嘴提供有力的理论依据。In order to further understand the mechanism of breakup of diesel jet,a mathematical model of fuel flow in self-excited oscillating nozzle was built based on large eddy simulation(LES)and Volume of Fluid(VOF)model.The results show that fluid vorticity and disturbance intensity in the self-excited oscillating nozzle is significantly increased,and it can increased by more than three times.The disturbance intensity is more sensitive to jet breakup in the near-nozzle region,which can significantly improve the jet breakup effect.The jet breakup length(SL)is greatly reduced,which can varies from 2 to 5 times of the outlet diameter at near-nozzle region.At the same time,the spray cone angle in the near-nozzle area is also increased,which can increase by more than 60%.The fuel jet atomization effect is greatly improved in the self-excited oscillating nozzle.The numerical simulation results is also provided a strong theoretical basis for the self-oscillating pulsed atomizing nozzle.

关 键 词：能源动力工程 自激振荡喷嘴 喷雾特性 射流破碎机理 湍流扰动 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]