空心锥压力旋流喷嘴雾化特性的影响因素分析
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摘要
采用数值模拟方法建立了压力旋流喷嘴模型,分析压力、喷雾高度与喷雾倾斜角度对液滴速度、直径、离散相模型(DPM)质量浓度等雾化特性的影响。结果表明:提高压力,导致液滴索特平均直径(SMD)减小,进而液滴数量通量增加幅度大;2.0 MPa时的液滴速度要高于1.5 MPa、1.0MPa时的液滴速度;液滴轴向平均速度随喷雾高度的增大而增大;喷雾倾斜角度从0°增大到40°时,液滴轴向平均速度下降,计算域右侧DPM质量浓度变化不明显,而左侧DPM质量浓度显著减小;液滴数量通量与喷雾覆盖区域面积大小成反比;随着喷雾高度的增大,液滴数量通量减小。
A model of pressure swirl nozzle was established using numerical simulation method,and the effects of spray pressure,spray height and tilt angle on the atomization characteristics were analyzed,such as the droplet velocity,droplet diameter and DPM concentration,etc.Results show that with the rise of spray pressure,the droplet Sauter mean diameter reduces,while the droplet flux increases.The droplet velocity at 2.0 MPa is higher than that at 1.5 MPa and 1.0 MPa.The average axial velocity of droplet increases with rising spray height.When the tilt angle of spray is increased from 0°to 40°,the average droplet velocity reduces,in which case,the DPM concentration on the right side of calculation domain basically remains stable,but that on the left side reduces significantly.The droplet flux is inversely proportional to the size of spray area,which reduces with the rise of spray height.
A model of pressure swirl nozzle was established using numerical simulation method,and the effects of spray pressure,spray height and tilt angle on the atomization characteristics were analyzed,such as the droplet velocity,droplet diameter and DPM concentration,etc.Results show that with the rise of spray pressure,the droplet Sauter mean diameter reduces,while the droplet flux increases.The droplet velocity at 2.0 MPa is higher than that at 1.5 MPa and 1.0 MPa.The average axial velocity of droplet increases with rising spray height.When the tilt angle of spray is increased from 0°to 40°,the average droplet velocity reduces,in which case,the DPM concentration on the right side of calculation domain basically remains stable,but that on the left side reduces significantly.The droplet flux is inversely proportional to the size of spray area,which reduces with the rise of spray height.
引文
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[17]王栋,梁国柱.N2O/C3H8发动机气液同轴离心式喷嘴喷雾性能数值模拟研究[J].火箭推进,2014,40(2):36-43.WANG Dong,LIANG Guozhu.Numerical simulation of spray performance of coaxial swirling injector for N2O/C3H8engine[J].Journal of Rocket Propulsion,2014,40(2):36-43.
[18]梁钦,高贵军,刘邱祖.压力型雾化喷嘴射流喷雾气-液两相流数值模拟[J].中国粉体技术,2015,21(2):5-9.LIANG Qin,GAO Guijun,LIU Qiuzu.Numerical simulation on gas-liquid two phase flow of pressure atomization nozzle jet spraying[J].China Powder Science and Technology,2015,21(2):5-9.
[19]吴里银.超声速气流中液体横向射流破碎与雾化机理研究[D].长沙:国防科学技术大学,2016.
[2]吴帅帅,李红智,陈鸿伟,等.脱硫废水烟道喷雾蒸发过程的数值模拟[J].热力发电,2015,44(12):31-36.WU Shuaishuai,LI Hongzhi,CHEN Hongwei,et al.Numerical study on spray evaporation process of desulfurization waste water in flue duct[J].Thermal Power Generation,2015,44(12):31-36.
[3]王祖林,张翼,苏国萍,等.燃煤电站脱硫废水零排放烟道喷雾蒸发特性的试验研究[J].动力工程学报,2018,38(4):291-297.WANG Zulin,ZHANG Yi,SU Guoping,et al.Spray evaporation characteristics of desulfurization waste water with zero discharge in coal-fired power plant[J].Journal of Chinese Society of Power Engineering,2018,38(4):291-297.
[4]米琇娟,刘艳茹.水基淬火液表面淬火时喷冷技术的应用总结[J].科学技术创新,2017(21):52-53.MI Xiujuan,LIU Yanru.Application of spray cooling technology in surface quenching of aqueous quenching liquid[J].Scientific and Technological Innovation,2017(21):52-53.
[5] HAN Xue,TAO Junjun,QIN Jun.Numerical study of water mist centerline velocity in microgravity[J].Chinese Science Bulletin,2014,59(25):3222-3226.
[6]周致富,陈斌,白飞龙,等.新型喷嘴R404a闪蒸瞬态喷雾冷却传热特性[J].化工学报,2015,66(增刊1):100-105.ZHOU Zhifu,CHEN Bin,BAI Feilong,et al.Heat transfer dynamics of R404aflashing pulsed spray cooling using expansion-chamber nozzle[J].CIESC Journal,2015,66(Sup1):100-105.
[7]聂涛,高贵军.压力旋流喷嘴雾化特性的实验研究[J].科学技术与工程,2016,16(7):162-164,172.NIE Tao,GAO Guijun.An experimental study on the spray characteristics of pressure swirl nozzle[J].Science Technology and Engineering,2016,16(7):162-164,172.
[8]林鸿亮,刘道银,刘猛,等.喷嘴雾化特性的试验及数值模拟[J].动力工程学报,2015,35(12):998-1005.LIN Hongliang,LIU Daoyin,LIU Meng,et al.Experimental study and numerical simulation on spray characteristics of different nozzles[J].Journal of Chinese Society of Power Engineering,2015,35(12):998-1005.
[9] HOU Yu,LIU Xiufang,LIU Jionghui,et al.Experimental study on phase change spray cooling[J].Experimental Thermal and Fluid Science,2013,46:84-88.
[10]周昊,郭无双,朱义凡,等.大流量低背压螺旋喷嘴的流量分布特性研究[J].动力工程学报,2017,37(7):577-583.ZHOU Hao,GUO Wushuang,ZHU Yifan,et al.Flow distribution characteristics of low-pressure highflux spiral nozzles[J].Journal of Chinese Society of Power Engineering,2017,37(7):577-583.
[11] CEBO-RUDNICKA A,MALINOWSKI Z,BUCZEK A.The influence of selected parameters of spray cooling and thermal conductivity on heat transfer coefficient[J].International Journal of Thermal Sciences,2016,110:52-64.
[12]侯燕.多喷嘴喷雾冷却实验研究与数值模拟[D].北京:中国科学院工程热物理研究所,2014.
[13]刘定平,方磊,肖尚.脱硫塔烟道喷雾脱硫技术模拟及试验研究[J].动力工程学报,2015,35(10):830-834.LIU Dingping,FANG Lei,XIAO Shang.Simulation and experimental study on atomizing desulfurization technology adopted in flue duct of desulfurization tower[J].Journal of Chinese Society of Power Engineering,2015,35(10):830-834.
[14] AMIRNORDIN S H,ISMAIL S,CHIN R Y S,et al.Effects of nozzle diameter on the spray characteristics of premix injector in burner system[J].Applied Mechanics and Materials,2015,773-774:570-574.
[15]甘云华,李海鸽,张夏,等.组合电极小型燃烧器的电学及雾化特性研究[J].中国电机工程学报,2017,37(8):2319-2328.GAN Yunhua,LI Haige,ZHANG Xia,et al.Study on the electrical and spraying characteristics of smallscale combustor with combined electrodes[J].Proceedings of the CSEE,2017,37(8):2319-2328.
[16]石庆宏,叶世超,张登平,等.旋转压力式喷嘴喷雾特性的实验研究[J].高校化学工程学报,2005,19(6):851-854.SHI Qinghong,YE Shichao,ZHANG Dengping,et al.The spray characteristics of swirl pressure nozzle[J].Journal of Chemical Engineering of Chinese Universities,2005,19(6):851-854.
[17]王栋,梁国柱.N2O/C3H8发动机气液同轴离心式喷嘴喷雾性能数值模拟研究[J].火箭推进,2014,40(2):36-43.WANG Dong,LIANG Guozhu.Numerical simulation of spray performance of coaxial swirling injector for N2O/C3H8engine[J].Journal of Rocket Propulsion,2014,40(2):36-43.
[18]梁钦,高贵军,刘邱祖.压力型雾化喷嘴射流喷雾气-液两相流数值模拟[J].中国粉体技术,2015,21(2):5-9.LIANG Qin,GAO Guijun,LIU Qiuzu.Numerical simulation on gas-liquid two phase flow of pressure atomization nozzle jet spraying[J].China Powder Science and Technology,2015,21(2):5-9.
[19]吴里银.超声速气流中液体横向射流破碎与雾化机理研究[D].长沙:国防科学技术大学,2016.