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Effects of the Residual/Sucked Air Bubbles on Diesel Near - Nozzle Spray Structure
Technical Paper
2017-01-2314
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Study of the spray formation in vicinity of the nozzle is essential to better understand and predict the physical processes involved in the diesel atomization. The initial spray patterns were found to be different from one injection to another during our visualization experiments, which was carried out based on a long distance microscope with a high speed camera in this work. It was found that the initial spray might contain a clear single mushroom, tail region and intact liquid column, or have a tail in front of the mushroom without changing its direction. Occasionally, it presented as a double-mushroom shape, or did not include a clear mushroom. Our visualization results showed that the various spray structures were observed at different injection pressures and different injection cycles under the same injection pressure. The difference of spray patterns may be due to the residual fuel/air bubbles surviving from the last injection or sucking into the nozzle during the needle opening, turbulent nature of the flow and the unsteady movement of the injector needle, while the reasons are not identified. In order to explain the various spray patterns, effects of the distribution of the simplified air bubbles inside the nozzle on the spray patterns at the start stages of the injection were further investigated with a combination of the LES method and VOF model coupling the cavitating flow inside the orifice. A higher injection pressure was set due to the faster the spray under the larger the injection pressure, and the operating condition was closer to the realistic diesel condition. The study confirmed that the initial mushroom and the tail were generated by the residual/sucked bubbles, and the main mushroom occurred because of the boundary layer theory. The location, size and amount of the residual/sucked air bubbles were responsible for the variation of initial spray structures between different injections. Moreover, the cavitation model was shown to play a role in the development of spray.
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Citation
Guo, G., He, Z., Wang, Q., Sun, S. et al., "Effects of the Residual/Sucked Air Bubbles on Diesel Near - Nozzle Spray Structure," SAE Technical Paper 2017-01-2314, 2017, https://doi.org/10.4271/2017-01-2314.Data Sets - Support Documents
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References
- Badock , C. , Wirth R. , Fath A. , and Leipertz A. 1999 Investigation of cavitation in real size diesel injection nozzles International Journal of Heat and Fluid Flow 20 5 538 544
- Battistoni , M. , Poggiani , C. , and Som , S. Prediction of the Nozzle Flow and Jet Characteristics at Start and End of Injection: Transient Behaviors SAE Int. J. Engines 9 1 84 97 2016 10.4271/2015-01-1850
- Battistoni M. , Kastengren A.L. , Powell C.F. , Som , S. 2014 Fluid Dynamics Modeling of End-of-Injection Process ILASS Americas Portland OR
- Battistoni , Michele , Xue Qingluan , and Som Sibendu 2016 Large-eddy simulation (LES) of spray transients: Start and end of injection phenomena Simulations aux grandes echelles (large-eddy simulation, LES) de transitoires de jets liquides : Phenomenes de debut et fin dinjection Oil and Gas Science and Technology 71 1
- Crua , Cyril , Heikal Morgan R. , and Gold Martin R. 2015 Microscopic imaging of the initial stage of diesel spray formation Fuel 157 140 150
- Crua , C. , Shoba , T. , Heikal , M. , Gold , M. et al. High-Speed Microscopic Imaging of the Initial Stage of Diesel Spray Formation and Primary Breakup SAE Technical Paper 2010-01-2247 2010 10.4271/2010-01-2247
- Delteil , J. , Vincent S. , Erriguible A. , and Subra-Paternault P. 2011 Numerical investigations in Rayleigh breakup of round liquid jets with VOF methods Computers & Fluids 50 1 10 23
- Desantes , J. M. , Payri R. , Salvador F. J. , and De La Morena J. 2010 Influence of cavitation phenomenon on primary break-up and spray behavior at stationary conditions Fuel 89 10 3033 3041
- Ding , Haichun , Wang Ziman , Li Yanfei , Xu Hongming , and Zuo Chengji 2016 Initial dynamic development of fuel spray analyzed by ultra high speed imaging Fuel 169 99 110
- Esmail , Mohamed , Kawahara Nobuyuki , Tomita Eiji , and Sumida Mamoru 2010 Direct microscopic image and measurement of the atomization process of a port fuel injector Measurement Science & Technology 21 7 190 190
- Faeth , GM , Hsiang L-P , and Wu P-K 1995 Structure and breakup properties of sprays International Journal of Multiphase Flow 21 99 127
- Ghiji , M. , Goldsworthy L. , Brandner P. A. , Garaniya V. , and Hield P. 2016 Numerical and experimental investigation of early stage diesel sprays Fuel 175 274 286
- Guo , Genmiao , He Zhixia , Chen Yuhang , Wang Qian , Leng Xianyin , and Sun Shenxin 2017 LES investigations on effects of the residual bubble on the single hole diesel injector jet International Journal of Heat and Mass Transfer 112 18 27
- Hattori , H. , Narumiya , K. , Tsue , M. , and Kadota , T. Analysis of Initial Breakup Mechanism of Diesel Spray Injected into High-Pressure Ambience SAE Technical Paper 2004-01-0528 2004 10.4271/2004-01-0528
- He , Zhixia , Chen Yuhang , Leng Xianyin , Wang Qian , and Guo Genmiao 2016 Experimental visualization and LES investigations on cloud cavitation shedding in a rectangular nozzle orifice International Communications in Heat and Mass Transfer 76 108 116
- He , Zhixia , Guo Genmiao , Tao Xicheng , Zhong Wenjun , Leng Xianying , and Wang Qian 2016 Study of the effect of nozzle hole shape on internal flow and spray characteristics International Communications in Heat and Mass Transfer 71 1 8
- He , Zhixia , Zhang Zhengyang , Guo Genmiao , Wang Qian , Leng Xianying , and Sun Shenxin 2016 Visual experiment of transient cavitating flow characteristics in the real-size diesel injector nozzle International Communications in Heat & Mass Transfer 78 13 20
- He , Zhixia , Zhong Wenjun , Wang Qian , Jiang Zhaochen , and Fu Yanan 2013 An investigation of transient nature of the cavitating flow in injector nozzles Applied Thermal Engineering 54 1 56 64
- Issa , Raad I. 1986 Solution of the implicitly discretised fluid flow equations by operator-splitting Journal of computational physics 62 1 40 65
- Klein-Douwel , R. J. H. , Frijters P. J. M. , Somers L. M. T. , De Boer W. A. , and Baert R. S. G. 2007 Macroscopic diesel fuel spray shadowgraphy using high speed digital imaging in a high pressure cell Fuel 86 12 1994 2007
- Kostas , J. , Honnery D. , and Soria J. 2009 Time resolved measurements of the initial stages of fuel spray penetration Fuel 88 11 2225 2237
- Koukouvinis , Phoevos , Gavaises Manolis , Li Jason , and Wang Lifeng 2016 Large Eddy Simulation of Diesel injector including cavitation effects and correlation to erosion damage Fuel 175 26 39
- Mitroglou , Nicholas , Mclorn Michael , Gavaises Manolis , Soteriou Celia , and Winterbourne Mark 2014 Instantaneous and ensemble average cavitation structures in Diesel micro-channel flow orifices Fuel 116 1 736 742
- Moon , Seoksu , Huang Weidi , Li Zhilong , and Wang Jin 2016 End-of-injection fuel dribble of multi-hole diesel injector: Comprehensive investigation of phenomenon and discussion on control strategy Applied Energy 179 7 16
- Pickett , Lyle M. , Manin Julien , Payri Raul , Bardi Michele , and Gimeno Jaime 2013 Transient rate of injection effects on spray development Addison-Wesley Press
- Reddemann , Manuel A. , Mathieu Florian , and Kneer Reinhold 2013 Transmitted light microscopy for visualizing the turbulent primary breakup of a microscale liquid jet Experiments in Fluids 54 11 1607
- Shinjo , J. , and Umemura A. 2010 Simulation of liquid jet primary breakup: Dynamics of ligament and droplet formation International Journal of Multiphase Flow 36 7 513 532
- Swantek , A.B. , Duke , J.D. , Tilocco , F.Z. , Sovis , N. , Powell , C.F. , Kastengren , A.L. 2014 End of Injection, Mass Expulsion Behaviors in Single Hole Diesel Fuel Injectors ILASS Americas Portland OR
- Wang , Ziman , Ding Haichun , Ma Xiao , Xu Hongming , and Wyszynski Miroslaw L. 2016 Ultra-high speed imaging study of the diesel spray close to the injector tip at the initial opening stage with single injection Applied Energy 165 335 344