Effect of Nozzle Nozzle Structural Parameters on Flow Field of Methanol Fuel Injection
-
摘要: 针对甲醇燃料不同于汽油的物化特性以及甲醇发动机冷启动困难等问题,以甲醇发动机喷油嘴喷孔为研究对象,采用Fluent软件的气液两相VOF湍流模型对喷嘴进行了数值模拟。研究发现了喷嘴入口处曲率半径变化以及喷嘴倒锥角度变化对喷嘴流量和雾化效果有一定的影响。结果表明:在压力不变的条件下,随着入口处曲率半径增大负压层的厚度逐渐变薄,喷孔内部气相体积分数减小,质量流量增大,雾化性能变差,但是喷孔的流速随着曲率半径的增大而增加;增大喷孔的倒锥角,喷嘴出口处的流速及质量流量均减小,但是负压层变厚有利于甲醇燃料的雾化。Abstract: According to the different physical and chemical properties of methanol fuel from gasoline, and the difficulty of cold start of methanol engine, we choose the nozzle of methanol engine as the research object. The gas-liquid two-phase VOF turbulence model in Fluent software is used to simulate the nozzle flow. The study finds that the fillet changes in the inlet nozzle and inverted cone angle changes of nozzle have certain influence on nozzle flow field. The results show that under the condition of constant pressure, the thickness of the negative pressure layer decreases with the increase of the radius of curvature at the entrance, the volume fraction of the gas phase decreases and the atomization performance decreases. With the increase of nozzle curvature radius, the flow rate increases. Increasing the inverted cone angle of the nozzle hole, the flow rate at the nozzle outlet is reduced, the mass flow rate is reduced, but the thickening of the negative pressure layer is favorable for the atomization of the methanol fuel.
-
Key words:
- methanol fuel nozzle /
- microstructure /
- inverted cone angle /
- Fluent /
- numerical analysis
-
[1] 李国军.甲醇汽车的开发应用研究[J].交通节能与环保,2014,10(3):37-40 Li G J. Study on intregrated development and application of methanol fueled vehicle[J]. Energy Conservation & Environmental Protection in Transportation, 2014,10(3):37-40(in Chinese) [2] 袁宝良,洪建海.甲醇燃料在点燃式发动机上的应用研究[J].现代车用动力,2016,(1):1-6 Yuan B L, Hong J H. Development of spark ignition methanol engine[J]. Modern Vehicle Power, 2016,(1):1-6(in Chinese) [3] 朱建军,寇子明,王淑平,等.纯甲醇发动机冷起动系统的研发[J].汽车工程,2011,33(4):298-302 Zhu J J, Kou Z M, Wang S P, et al. Research and development of the cold start system for pure methanol engine[J]. Automotive Engineering, 2011,33(4):298-302(in Chinese) [4] 汪洋,王雪雁,蒋宁涛,等.甲醇发动机的性能研究[J].燃烧科学与技术,2006,12(5):390-393 Wang Y, Wang X Y, Jiang N T, et al. Study on the performance of methanol engine[J]. Journal of Combustion Science and Technology, 2006,12(5):390-393(in Chinese) [5] 朱庆功,张梦,包伟,等.甲醇汽车冷起动性研究[J].交通节能与环保,2013,9(4):33-36 Zhu Q G, Zhang M, Bao W, et al. Research of the cold start for methanol automobile[J]. Energy Conservation & Environmental Protection in Transportation, 2013,9(4):33-36(in Chinese) [6] 吴亚兰,王进,刘萌,等伟纯甲醇发动机冷起动系统开发[J].车用发动机,2014,(5):27-29 Wu Y L, Wang J, Liu M, et al. Development of cold start system for methanol engine[J]. Vehicle Engine, 2014,(5):27-29(in Chinese) [7] 李劲松,韩恒信.提高喷油嘴流量系数的探讨[J].柴油机设计与制造,2003,(3):33-35 Li J S, Han H X. Discussion on injection nozzle flow coefficient improvement[J]. Design & Manufacture of Diesel Engine, 2003,(3):33-35(in Chinese) [8] 房建峰,杜慧勇,刘建新,等.喷油嘴流量系数对燃油喷雾及柴油机性能的影响[J].河南科技大学学报(自然科学版),2004,25(2):24-27 Fang J F, Du H Y, Liu J X, et al. Effect of flow coefficient on fuel spray and diesel engine performance[J]. Journal of Henan University of Science & Technology (Natural Science), 2004,25(2):24-27(in Chinese) [9] Okajima M, Kato M, Kano H, et al. Contribution of optimum nozzle design to injection rate control[R]. SAE Paper 910185. New York:SAE International, 1991 [10] 王福军.计算流体动力学分析-CFD软件原理与应用[M].北京:清华大学出版社,2004 Wang F J. Computational fluid dynamics analysis[M]. Beijing:Tsinghua University Press, 2004(in Chinese) [11] Sun H Q, Shi Y M. Self-Adjoint extensions for singular linear Hamiltonian systems[J]. Mathematische Nachrichten, 2011,284(5-6):797-814 [12] Catania A E, Ferrari A, Spessa E. Temperature variations in the simulation of high-pressure injection-system transient flows under cavitation[J]. International Journal of Heat and Mass Transfer, 2008,51(7-8):2090-2107 [13] Nilsson H, Davidson L. Validations of CFD against detailed velocity and pressure measurements in water turbine runner flow[J]. International Journal of Numerical Methods in Fluids, 2003,41(8):863-879 [14] 俞建达,缪雪龙,杨威,等.喷油嘴流量系数影响因素及其喷射特性研究[J].现代车用动力,2007,(3):19-23 Yu J D, Miao X L, Yang W, et al. Study on effected factor and injection characteristics of nozzle flow coefficient[J]. Modern Vehicle Power, 2007,(3):19-23(in Chinese) [15] 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 Z X, Li D T, Hu L F, 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)
点击查看大图
计量
- 文章访问数: 265
- HTML全文浏览量: 33
- PDF下载量: 15
- 被引次数: 0