幂律流体双股碰撞雾化特征的实验研究
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摘要
为深入研究双股射流碰撞系统的雾化特性,基于双股射流碰撞雾化实验台,采用PIV测速仪,通过改变双股射流的射流不对称性、添加氮气气流扰动以及添加金属铝粒子,来实验探究上述因素对于幂律流体雾化的影响.实验结果表明:韦伯数较小时,幂律流体以一定偏心度碰撞会形成链状液膜,链结长度随偏心度增大而减小;当双股射流以不同长度撞击时,幂律流体会出现鱼骨模式,该现象在0.15%卡波姆凝胶中较为明显;添加气流扰动能增大幂律流体液膜表面波的强度,导致液膜宽度变薄、液膜边缘提前破裂,并且当韦伯数较小时,液滴索太尔平均直径减小;添加金属粒子使幂律流体强度变低,最大破碎长度变小,提前进入各个破碎模式,更早达到液滴平均直径收敛值.采用一定的偏心度,适当加入气流扰动和金属粒子,有助于改善幂律流体雾化性能.
On the impinging injector platform,the effects of jet asymmetry,airflow disturbances and metal particles on the atomization characteristics were studied by PIV( particle image velocimetry) technology. The experimental results indicate that when the two asymmetric jets impinges at low weber number,the chain sheet appears,and as the eccentricity increases,the link-length decreases. Fish bones regime can be found when the jet is with different length. Additional airflow disturbances can increase the atomization quality,because when the surface wave ' s intensity is increased,it will break up more easily,as a result,the width of fluid sheet and the SMD( sauter mean diameter) of droplets decrease. When power-law fluid contains aluminum particles,its strength is smaller and its max length decreases obviously. The droplets ' SMD convergence does not change,as well,the SMD reaches convergence in shorter time. In conclusion,proper jet asymmetry,airflow disturbances and metal particles can improve impinging jets' atomization performance with power-law fluid.
On the impinging injector platform,the effects of jet asymmetry,airflow disturbances and metal particles on the atomization characteristics were studied by PIV( particle image velocimetry) technology. The experimental results indicate that when the two asymmetric jets impinges at low weber number,the chain sheet appears,and as the eccentricity increases,the link-length decreases. Fish bones regime can be found when the jet is with different length. Additional airflow disturbances can increase the atomization quality,because when the surface wave ' s intensity is increased,it will break up more easily,as a result,the width of fluid sheet and the SMD( sauter mean diameter) of droplets decrease. When power-law fluid contains aluminum particles,its strength is smaller and its max length decreases obviously. The droplets ' SMD convergence does not change,as well,the SMD reaches convergence in shorter time. In conclusion,proper jet asymmetry,airflow disturbances and metal particles can improve impinging jets' atomization performance with power-law fluid.
引文
[1]曹伟.幂律流体双股射流碰撞雾化的试验研究[D].哈尔滨:哈尔滨工业大学,2016.
[2]HUANG J C P.The break-up of axisymmetric liquid sheets[J].Journal of Fluid Mechanics,1970,43(2):305-319.
[3]HEIDMANN M F,PRIEM R J,HUMPHREY J C.A study of sprays formed by two impinging jets[J].World Literature Today,1957(4):681-682.
[4]DOMBROWSKI N D,HOOPER P C.A study of the sprays formed by impinging jets in laminar and turbulent flow[J].Journal of Fluid Mechanics,1964,18(3):392-400.
[5]ANDERSON W E,RYAN H M,PAL S,et al.Fundamental studies of impinging liquid jets[J].Reston:AIAA Press,1992:92-0458.
[6]RYAN H M,ANDERSON W E,PAL S,et al.Atomization characteristics of impinging liquid jets[J].Journal of Propulsion and Power,1995,11(1):135-145.
[7]LAL W H,HUANG W,JIANG T L.Characteristic study on the likedoublet impinging jets atomization[J].Atomization and Sprays,1999,9(3):277-289.
[8]YUAN T,CHEN C,CHEN Y D,et al.The observation of the atomization and mixing of doublet-jets impinging sprays at elevated ambient pressures[C]//12th Triennial International Conference on Liquid Atomization and Spray Systems.Heidelberg:Institute for Liquid Atomization and Spray Systems(ILASS),2012:184-190.
[9]INOUEC,WATANABE T,HIMENO T,et al.Impinging atomization enhanced by microjet injection—effect,mechanism and optimization[C]//49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference.San Jose:American Institute of Aeronautics and Astronautics(AIAA),2013-3705.
[10]BAI F,DIAO H,ZHANG M,et al.Breakup characteristics of power-law liquid sheets formed by two impingingjets[J].Fluid Dynamics Research,2014,46(5):055506.
[11]BAEK G,KIM S,HAN J,et al.Atomization characteristics of impinging jets of gel material containing nanoparticles[J].Journal of Non-Newtonian Fluid Mechanics,2011,166(21):1272-1285.
[12]张蒙正,张泽平,李鳌,等.两股互击式喷嘴雾化性能实验研究[J].推进技术,2000,21(01):58-60.ZHANG Mengzheng,ZHANG Zeping,LI Ao.et al.Experimental research on spray properties of unlike impinging injectors[J].Journal of Propulsion Technology,2000,21(01):58-60.
[13]张蒙正,杨伟东,王玫.双股互击式喷嘴凝胶水雾化特性试验[J].推进技术,2008,29(1):22-24+61.ZHANG Mengzheng,YANG Weidong,WANG Mei.et al.Test of unlike impinging injector atomization characteristic with gelled water[J].Journal of Propulsion Technology,2008,29(1):22-24+61.
[14]陈杰,封锋,马虎,等.基于PIV的凝胶模拟液撞击雾化速度场实验研究[J].推进技术,2014(4):565-569.CHEN Jie,FENG Feng,MA Hu.et al.Experimental study on impinging velocimetry of gel simulants based on PIV[J].Journal of Propulsion Technology,2014(4):565-569.
[15]杜青,马永翠,白富强,等.幂律流体撞击式射流破碎特征试验[J].天津大学学报(自然科学与工程技术版),2016(2):158-163.DU Qing,MA Yongcui,BAI Fuqiang.et al.Experiment on the breakup characteristics of impinging jets of power law fluid[J].Journal of Tianjin University(Science and Technology),2016(2):158-163.
[16]李建军,李珍妮,夏振炎,等.幂律流体撞击射流液膜破碎特征的实验研究[C]//中国力学学会—2015论文摘要集.上海:中国力学学会,2015:194.LI Jianjun,LI Zhenni,XIA Zhenyan.et al.Experiment on the breakup characteristics of impinging jets of power law fluid[C]//Chinese Society of Theoretical and Applied Mechanics—2015 meeting abstract book.Shanghai:Chinese Society of Theoretical and Applied Mechanics,2015:194.
[17]JUNG S,HOATH S D,MARTIN G D,et al.Atomization patterns produced by the oblique collision of two Newtonian liquid jets[J].Physics of Fluids,2010,22(4):557-563.
[2]HUANG J C P.The break-up of axisymmetric liquid sheets[J].Journal of Fluid Mechanics,1970,43(2):305-319.
[3]HEIDMANN M F,PRIEM R J,HUMPHREY J C.A study of sprays formed by two impinging jets[J].World Literature Today,1957(4):681-682.
[4]DOMBROWSKI N D,HOOPER P C.A study of the sprays formed by impinging jets in laminar and turbulent flow[J].Journal of Fluid Mechanics,1964,18(3):392-400.
[5]ANDERSON W E,RYAN H M,PAL S,et al.Fundamental studies of impinging liquid jets[J].Reston:AIAA Press,1992:92-0458.
[6]RYAN H M,ANDERSON W E,PAL S,et al.Atomization characteristics of impinging liquid jets[J].Journal of Propulsion and Power,1995,11(1):135-145.
[7]LAL W H,HUANG W,JIANG T L.Characteristic study on the likedoublet impinging jets atomization[J].Atomization and Sprays,1999,9(3):277-289.
[8]YUAN T,CHEN C,CHEN Y D,et al.The observation of the atomization and mixing of doublet-jets impinging sprays at elevated ambient pressures[C]//12th Triennial International Conference on Liquid Atomization and Spray Systems.Heidelberg:Institute for Liquid Atomization and Spray Systems(ILASS),2012:184-190.
[9]INOUEC,WATANABE T,HIMENO T,et al.Impinging atomization enhanced by microjet injection—effect,mechanism and optimization[C]//49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference.San Jose:American Institute of Aeronautics and Astronautics(AIAA),2013-3705.
[10]BAI F,DIAO H,ZHANG M,et al.Breakup characteristics of power-law liquid sheets formed by two impingingjets[J].Fluid Dynamics Research,2014,46(5):055506.
[11]BAEK G,KIM S,HAN J,et al.Atomization characteristics of impinging jets of gel material containing nanoparticles[J].Journal of Non-Newtonian Fluid Mechanics,2011,166(21):1272-1285.
[12]张蒙正,张泽平,李鳌,等.两股互击式喷嘴雾化性能实验研究[J].推进技术,2000,21(01):58-60.ZHANG Mengzheng,ZHANG Zeping,LI Ao.et al.Experimental research on spray properties of unlike impinging injectors[J].Journal of Propulsion Technology,2000,21(01):58-60.
[13]张蒙正,杨伟东,王玫.双股互击式喷嘴凝胶水雾化特性试验[J].推进技术,2008,29(1):22-24+61.ZHANG Mengzheng,YANG Weidong,WANG Mei.et al.Test of unlike impinging injector atomization characteristic with gelled water[J].Journal of Propulsion Technology,2008,29(1):22-24+61.
[14]陈杰,封锋,马虎,等.基于PIV的凝胶模拟液撞击雾化速度场实验研究[J].推进技术,2014(4):565-569.CHEN Jie,FENG Feng,MA Hu.et al.Experimental study on impinging velocimetry of gel simulants based on PIV[J].Journal of Propulsion Technology,2014(4):565-569.
[15]杜青,马永翠,白富强,等.幂律流体撞击式射流破碎特征试验[J].天津大学学报(自然科学与工程技术版),2016(2):158-163.DU Qing,MA Yongcui,BAI Fuqiang.et al.Experiment on the breakup characteristics of impinging jets of power law fluid[J].Journal of Tianjin University(Science and Technology),2016(2):158-163.
[16]李建军,李珍妮,夏振炎,等.幂律流体撞击射流液膜破碎特征的实验研究[C]//中国力学学会—2015论文摘要集.上海:中国力学学会,2015:194.LI Jianjun,LI Zhenni,XIA Zhenyan.et al.Experiment on the breakup characteristics of impinging jets of power law fluid[C]//Chinese Society of Theoretical and Applied Mechanics—2015 meeting abstract book.Shanghai:Chinese Society of Theoretical and Applied Mechanics,2015:194.
[17]JUNG S,HOATH S D,MARTIN G D,et al.Atomization patterns produced by the oblique collision of two Newtonian liquid jets[J].Physics of Fluids,2010,22(4):557-563.