基于数值模拟的汽油机喷嘴结构优化CFD分析
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摘要
以5WY-2817A汽油机喷嘴为研究对象,旨在提高该汽油机喷嘴流动特性,利用UG软件对喷嘴进行实体建模,通过喷雾稳态试验对模拟计算提供边界条件。利用AVL-FIRE软件进行喷嘴稳流三维数值计算,研究了不同压力室高度、喷孔分布直径和阀座锥角对喷孔处压力与速度的影响关系。研究结果表明,压力室高度0.2mm,喷孔分布直径1.4mm,阀座锥角43°时喷孔处燃油流动特性最佳。该结构优化可作为改善喷嘴雾化性能的最佳方案。
The nozzle of 5 WY-2817 Agasoline engine was studied to improve the flow characteristics of the engine nozzle.The UG software was used to establish the nozzle model,and the boundary condition was provided by the steady state spray test.Three dimensional numerical simulation of nozzle steady flow was carried out by using AVL-FIRE software.The influence of pressure cham berheight,diameter of nozzle distribution and valve seat cone angle on pressure and velocity at injection hole was studied.The results show that whenthe pressure cham ber heightis 0.2 mm,the diameter of nozzle distribution is 1.4 mm and the valve seat cone angle is 43 degrees,the best fuel flow characteristics at the nozzle holecould be reached.The optimization of the structure can be used as the best project to improve the atomization performance of the nozzle.
The nozzle of 5 WY-2817 Agasoline engine was studied to improve the flow characteristics of the engine nozzle.The UG software was used to establish the nozzle model,and the boundary condition was provided by the steady state spray test.Three dimensional numerical simulation of nozzle steady flow was carried out by using AVL-FIRE software.The influence of pressure cham berheight,diameter of nozzle distribution and valve seat cone angle on pressure and velocity at injection hole was studied.The results show that whenthe pressure cham ber heightis 0.2 mm,the diameter of nozzle distribution is 1.4 mm and the valve seat cone angle is 43 degrees,the best fuel flow characteristics at the nozzle holecould be reached.The optimization of the structure can be used as the best project to improve the atomization performance of the nozzle.
引文
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[10]杨洪磊,郑洪涛.双燃料燃气轮机喷嘴结构设计与数值模拟[J].热科学与技术,2010,9(3):262-269.YANG Hong-lei,ZHENG Hong-tao.Structure design and numerical simulation of dual-fuel gas turbine nozzle[J].Journal of Thermal Science and Technology,2010,9(3):262-269.(in Chinese)
[11]刘孟莹.基于某小型汽油机喷油嘴结构优化的CFD分析[D].柳州:广西科技大学,2016.LIU Meng-ying.CFD Analysis of a Small Gasoline Engine Based on the Structure Optimization[D].Liuzhou:Guangxi University of Science and Technology,2016.(in Chinese)
[12]文华.基于CFD的柴油机喷雾混合过程的多维数值模拟[D].武汉:华中科技大学,2004.WEN Hua.Multi-dimensional Numerical Modeling of Spray Mixing Process in Diesel Engines Based on CFD[D].Wuhan:Huazhong University of Science and Technology,2004.(in Chinese)
[2]何志霞,李德桃,胡林峰,等.喷油嘴喷孔内部空穴两相流动数值模拟分析[J].内燃机学报,2004,22(5):433-438.HE Zhi-xia,LI De-tao,HU Lin-feng,et al.Numerical simulation and analysis of two-phase flow of inner cavitation in injection nozzles[J].Transactions of CSICE,2004,22(5):433-438.(in Chinese)
[3]魏明锐,文华,刘会猛,等.柴油机孔式喷油嘴内空穴流动的数值模拟分析[J].内燃机学报,2006,24(6):526-530.WEI Ming-rui,WEN Hua,LIU Hui-meng,et al.Sim ulation analysis on cavitation flow in a diesel engine nozzle[J].Transactions of CSICE,2006,24(6):526-530.(in Chinese)
[4]夏少华,郑金保,缪雪龙,等.电磁喷油器球阀流动分析[J].内燃机学报,2012,30(4):354-358.XIA Shao-hua,ZHENG Jin-bao,MIAO Xue-long,et al.Cavitation analysis on ball valve in solenoid injector[J].Transactions of CSICE,2012,30(4):354-358.(in Chinese)
[5]SHERVANI-TABAR M T,PARSA S,GHORBAIN M.Numerical study on the effect of the cavitation phenomenon on the characteristics of fuel spray[J].Mathematical and Computer Modeling,2012,56(5-6):105-117.
[6]LOPEZ J J,SALVADOR F J,De La GARZA O A,et al.A comprehensive study on the effect of cavitation on injection velocity in diesel nozzles[J].Energy Conversion and Management,2012,64:415-423.
[7]PAYRI R,GIMENO J,MARTI-ALDARAVI P,et al.Study of the influence of the inlet boundary conditions in a LES simulation of internal flow in a diesel injector[J].Mathematical and Computer Modelling,2013,57(7-8):1709-1715.
[8]丁红元,刘芬,黄荣华,等.直喷汽油机多孔喷油器喷嘴内部流动数值模拟[J].农业机械学报,2013,44(3):6-11.DING Hong-yuan,LIU Fen,HUANG Rong-hua,et al.Numerical simulation of nozzle flow in GDI multi-hole injector[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(3):6-11.(in Chinese)
[9]颜学升.柴油机喷嘴结构对喷雾特性的影响研究[D].镇江:江苏大学,2013.YAN Xue-sheng.Researches on the Influences of Nozzle Structure on Spray Characteristics for Diesel Engines[D].Zhenjiang:Jiangsu University,2013.(in Chinese)
[10]杨洪磊,郑洪涛.双燃料燃气轮机喷嘴结构设计与数值模拟[J].热科学与技术,2010,9(3):262-269.YANG Hong-lei,ZHENG Hong-tao.Structure design and numerical simulation of dual-fuel gas turbine nozzle[J].Journal of Thermal Science and Technology,2010,9(3):262-269.(in Chinese)
[11]刘孟莹.基于某小型汽油机喷油嘴结构优化的CFD分析[D].柳州:广西科技大学,2016.LIU Meng-ying.CFD Analysis of a Small Gasoline Engine Based on the Structure Optimization[D].Liuzhou:Guangxi University of Science and Technology,2016.(in Chinese)
[12]文华.基于CFD的柴油机喷雾混合过程的多维数值模拟[D].武汉:华中科技大学,2004.WEN Hua.Multi-dimensional Numerical Modeling of Spray Mixing Process in Diesel Engines Based on CFD[D].Wuhan:Huazhong University of Science and Technology,2004.(in Chinese)