微型涡喷发动机喷油环优化设计
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摘要
喷油环是微型涡喷发动机的重要组成部分,其喷油量的均匀性决定了燃烧室温度场的均匀性。针对微型涡喷发动机喷油环喷油量不均匀问题,采用不等径喷油针结构方案来补偿压力损失影响;运用CFX软件数值模拟实验时喷油环内部的三维流场,并计算喷油环环体上各喷油针的出口流量值、出口速度以及喷油环整个内部流场的压力变化情况,最后与实验结果对比。结果表明:不等径喷油针结构方案可以较好的改善喷油环喷油量不均匀问题,可为研究喷油环内部流场奠定基础。
The fuel injection ring is an important part of the micro-turbojet engine.The uniformity of fuel injection quantity determines the uniformity of the temperature field in the combustion chamber.Aiming at microturbojet injection ring uneven fuel injection problems,the influence of pressure loss is compensated through the use of unequal-diameter needle structure.By using CFX software,the experiment of three-dimensional flow field inside the fuel injection ring is simulated and the outlet flow rate,outlet velocity and the pressure change of the entire internal flow field of injection needle on the injection ring body are calculated and compared with the experimental results.Results show that the scheme of unequal injection nozzle can improve the problem of nonuniform injection of fuel injection ring.According to the calculated results,we can lay the foundation for the study of the internal flow field of the injection ring.
The fuel injection ring is an important part of the micro-turbojet engine.The uniformity of fuel injection quantity determines the uniformity of the temperature field in the combustion chamber.Aiming at microturbojet injection ring uneven fuel injection problems,the influence of pressure loss is compensated through the use of unequal-diameter needle structure.By using CFX software,the experiment of three-dimensional flow field inside the fuel injection ring is simulated and the outlet flow rate,outlet velocity and the pressure change of the entire internal flow field of injection needle on the injection ring body are calculated and compared with the experimental results.Results show that the scheme of unequal injection nozzle can improve the problem of nonuniform injection of fuel injection ring.According to the calculated results,we can lay the foundation for the study of the internal flow field of the injection ring.
引文
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[2]Okajima M,Kato M,Tojo S.Contribution of optimun nozzle design to injection rate control[R].SAE,1991,912-185:232245.
[3]Date K,Manable M,Kano H.Contribution of fuel flow improvement in nozzle to spray formation[R].SAE,1992,920622:11491159.
[4]杨立军,张向阳,高芳.液体喷嘴动态特性数值模拟[J].航空动力学报,2004,19(6):866-872.Yang Lijun,Zhang Xiangyang,Gao Fang,et al.Numerical simulation of liquid injector dynamics[J].Journal of Aerospace Power,2004,19(6):866-872.(in Chinese)
[5]王飞,雷勇,杨华.航空发动机燃烧室喷油环三维流场数值模[J].航空动力学报,2007,22(9):1439-1443.Wang Fei,Lei Yong,Yang Hua.Numerical simulation of3Dflow field in an aeroengine combustor nozzleloop[J].Journal of Aerospace Power,2007,22(9):1439-1443.(in Chinese)
[6]徐波,张宗杰.三维流场数值模拟在柴油机喷油嘴中的应用[J].柴油机设计与制,2005,14(1):29-33.Xu Bo,Zhang Zongjie.Application of three dimensional flow simulation in diesel engine injector nozzle[J].Design&Manufacture of Diesel Engine,2005,14(1):29-33.(in Chinese)
[7]袁江涛,欧阳光耀,刘镇.基于CFD与FEA的柴油机喷嘴疲劳强度分析[J].内燃机工程,2005,26(4):32-34.Yuan Jiangtao,Ouyang Guangyao,Liu Zhen.Fatigue nalysis in ozzle of diesel engine based on CFD and FEA[J].Chinese Internal Combustion Engine Engineering,2005,26(4):32-34.(in Chinese)
[8]贾友昌,曾东建,黄海波.柴油机喷嘴内的流场模拟[C]∥2006代用燃料汽车国际学术会议论文集,2006.Jia Youchang,Zeng Dongjian,Huang Haibo.CFD analysis of flow in nozzle of diesel engine[C]∥ICAFV’2006.(in Chinese)
[9]徐初力,唐传忠.某型喷嘴流量特性的数值模拟[J].节能技术,2006,24(3):287-288.Xu Chuli,Tang Chuanzhong.Numerical simulation on the flux characteristics of nozzle[J].Energy Conservation Technology,2006,24(3):287-288.(in Chinese)
[10]赵硕,张宝诚,陈俊.某型航空发动机燃油喷嘴实验及火焰筒头部的数值模拟[J].航空发动机,2008,34(2):39-43.Zhao Shuo,Zhang Baocheng,Chen Jun.Experiment of an aeroengine fuel nozzle and numerical simulation of combustor liner head[J].Aeroengine,2008,34(2):39-43.(in Chinese)
[11]陈佐一,王鹏飞,王珏.用振荡流体力学方法分析气液喷嘴内流体振荡的传播规律[J].导弹与航天运载技术,1998(4):21-26.Chen Zuoyi,Wang Pengfei,Wang Jue.The propagation Rule analysis of fluid oscillation in air-liquid injector with oscillation fluid mechanics method[J].Missile and Space Vechicles,1998(4):21-26.(in Chinese)
[12]杨树人,谭放,张莹.空化喷嘴内部流场的数值模拟[J].科学技术与工程,2010,10(33):30-32.Yang Shuren,Tan Fang,Zhang Ying.Numerical simulation on internet flow field in cavitating nozzle[J].Science Technology and Engineering,2010,10(33):30-32.(in Chinese)
[13]韩占忠,王敬,兰小平.Fluent流体工程仿真计算实例与应用[M].北京:北京理工大学出版社,2005.Han Zhanzhong,Wang Jing,Lan Xiaoping.Fluent fluid engineering simulation calculation example and application[M].Beijing:Beijing Institute of Technology Press,2005.(in Chinese)
[14]谢龙汉,赵新宇,张炯明.ANSYS CFX流体分析及仿真[M].北京:电子工业出版社,2012.Xie Longhan,Zhao Xinyu,Zhang Jiongming.ANSYS CFX fluid analysis and simulation[M].Beijing:Electronic Industry Press,2012.(in Chinese)
[15]苏铭德,黄素逸.计算流体力学基础[M].北京:清华大学出版社,1997.Su Deming,Huang Suyi.Computational fluid dynamics foundation[M].Beijing:Tsinghua University Press,1997.(in Chinese)