内交叉喷嘴内部冲击效应雾化机理研究  

Internal Impact Effect on the Atomization Mechanism of Internal Intersecting Nozzles

作　　者：刘灿旭 潘业俊 刘红[1] 贾明[1] 田江平[1] 张威龙 Liu Canxu;Pan Yejun;Liu Hong;Jia Ming;Tian Jiangping;Zhang Weilong(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院,大连116024

出　　处：《燃烧科学与技术》2023年第4期414-420,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51961135105,91641117);天津大学内燃机燃烧学国家重点实验室开放基金资助项目(K2018-04).

摘　　要：与传统的单圆柱孔喷嘴相比,内交叉孔喷嘴由于其具有较高的流量系数和在促进射流破碎方面的显著优势而逐渐得到应用.本研究利用OpenFOAM平台进行数值研究以讨论内交叉孔喷嘴的内部流动和射流破碎机理.采用已搭建的混合多流体准-VOF模型,对同孔径不同相交角为20°和25°的交叉孔喷嘴以及单圆柱孔喷嘴进行了多相流计算及实验验证.结果表明,计算结果与实验值有很好的一致性.与圆柱形单孔喷嘴相比,采用内交叉孔喷嘴能够有效抑制空化,提高流量系数.另外,表面波在交叉面和扩散面上的发展差异是产生扇形喷雾的主要原因.而增大内交叉喷嘴的交叉角在一定程度上可以有效提高内部冲击效应,从而促进雾化.Compared with the traditional single-cylindrical nozzle,the internal intersecting nozzle has gradually been used due to its higher discharge coefficient and significant advantages in promoting jet breakup.In this study,the OpenFOAM platform was used to conduct a numerical study to discuss the mechanisms of internal flow and jet breakup of the internal intersecting nozzle.The established mixed multi-fluid quasi-VOF(Volume of Fluid)model was applied to carry out the multi-phase flow calculation and experimental verification for both the internal intersecting nozzle with the same aperture and different intersection angles(20°and 25°)and the singlecylindrical nozzle.The results show that the calculated results are in good agreement with the experimental values.Compared with the single-cylindrical nozzle,the internal intersecting nozzle can effectively suppress cavitation and improve discharge coefficient.In addition,the difference in the development of surface wave on the intersection surface and the diffusion surface is the main reason for the generation of a fan-shaped spray.However,increasing the intersecting angle of the internal intersecting nozzle can effectively improve the internal impact effect to a certain extent,thereby promoting atomization.

关 键 词：多流体准-VOF模型 内交叉孔 内部冲击效应 机理 雾化 

分 类 号：TK11[动力工程及工程热物理—热能工程]