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Effect of Injection Pressure on Nozzle Internal Flow and Jet Breakup under Sub-Cooled and Flash Boiling Test Conditions
Technical Paper
2019-01-0286
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Injection pressure plays a vital role in spray break-up and atomization. High spray injection pressure is usually adopted to optimize the spray atomization in gasoline direct injection fuel system. However, higher injection pressure also leads to engine emission problem related to wall wetting. To solve this problem, researchers are trying to use flash boiling method to control the spray atomization process under lower injection test conditions. However, the effect of injection pressure on the spray atomization under flash boiling test condition has not been adequately investigated yet. In this study, quantitative study of internal flow and near nozzle spray breakup were carried out based on a two-dimensional transparent nozzle via microscopic imaging and phase Doppler interferometery. N-hexane was chosen as test fluid with different injection pressure conditions. Fuel temperature varied from 112°C to 148°C, which covered a wide range of superheated conditions. Injection pressure was varied from 3MPa to 5MPa. The effect of injection pressures on nozzle internal flow and jet breakup is analyzed experimentally. As a result, decreasing injection pressure leads to smaller droplet size and better spray breakup near the nozzle exit under flash boiling test conditions. It is because lower injection pressure enhances the growth of bubbles inside of the nozzle and the spray primary breakup near the nozzle. It can be inferred that although higher injection pressure can increase the spray velocity near nozzle, the primary breakup is controlled by flash boiling bubbles inside of the nozzle. Therefore, higher injection pressure leads to better secondary breakup.
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Yang, S., Li, X., Hung, D., and Xu, M., "Effect of Injection Pressure on Nozzle Internal Flow and Jet Breakup under Sub-Cooled and Flash Boiling Test Conditions," SAE Technical Paper 2019-01-0286, 2019, https://doi.org/10.4271/2019-01-0286.Data Sets - Support Documents
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References
- Zeng , W. , Xu , M. , Zhang , G. , Zhang , Y. et al. Atomization and Vaporization for Flash-Boiling Multi-Hole Sprays with Alcohol Fuels Fuel 95 287 297 2012
- Zhang , G. , Xu , M. , Zhang , Y. , Zhang , M. et al. Macroscopic Characterization of Flash-Boiling Multi-Hole Sprays using Planar Laser Induced Exciplex Fluorescence Technique. Part I. On-Axis Spray Structure Atomization and Sprays 22 861 878 2012
- Zhang , M. , Xu , M. , Zhang , Y. , Zhang , G. et al. Flow-Field Investigation of Multi-Hole Superheated Sprays using High-Speed PIV. Part I. Cross-Sectional Direction Atomization and Sprays 22 983 995 2012
- Xu , M. , Zhang , Y. , Zeng , W. , Zhang , G. et al. Flash Boiling: Easy and Better Way to Generate Ideal Sprays than the High Injection Pressure SAE International Journal of Fuels and Lubricants 6 137 148 2013
- Xu Q. , Xu M. , Hung D. , Li T. et al. Suppressed Prompt Atomization of Flash-Boiling Spray by Elevating Injection Pressure ILASS-Asia 2017, 19th Annual Conference on Liquid Atomization and Spray Systems - Asia Jeju, Korea 2017
- Park , Y. , Hwang , J. , Bae , C. , Kim , K. et al. Effects of Diesel Fuel Temperature on Fuel Flow and Spray Characteristics Fuel 162 1 7 2015
- Wu , S. , Pan , H. , Xu , M. , Hung , D. et al. Investigation of Rapid Atomization and Collapse of Superheated Liquid Fuel Spray under Superheated Conditions Atomization and Sprays 26 1361 1384 2016
- Park , B.S. and Lee , S.Y. An Experimental Investigation of the Flash Atomization Mechanism Atomization and Sprays 4 1994
- Sher , E. , Bar-Kohany , T. , and Rashkovan , A. Flash-Boiling Atomization Progress in Energy and Combustion Science 34 417 439 2008
- Ju , D. , Huang , Z. , Jia , X. , Qiao , X. et al. Macroscopic Characteristics and Internal Flow Pattern of Dimethyl Ether Flash-Boiling Spray Discharged through a Vertical Twin-Orifice Injector Energy 114 1240 1250 2016
- Wu , S. , Xu , M. , Hung , D.L.S. , and Pan , H. In-Nozzle Flow Investigation of Flash Boiling Fuel Sprays Applied Thermal Engineering 117 644 651 2017
- Yang , S. , Li , X. , Hung , D.L.S. , and Xu , M. Characteristics and Correlation of Nozzle Internal Flow and Jet Breakup under Flash Boiling Conditions International Journal of Heat and Mass Transfer 127 959 969 2018