Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Study on Spray Atomization Characteristics Depending on the Operating Parameters of Urea Injector

요소수 인젝터의 작동 변수에 따른 분무미립화 성능에 관한 연구

  • 김동환 (한양대학교 대학원 융합기계공학과) ;
  • 박준규 (한양대학교 부설 산업과학연구소) ;
  • 박성욱 (한양대학교 기계공학부)
  • Received : 2018.12.08
  • Accepted : 2019.02.14
  • Published : 2019.03.30
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Abstract

This study was carried out to analyze the spray characteristics as a function of the operating parameters of urea injector used in Urea-SCR system of passenger diesel vehicle. Spray visualization and PDPA experiment were performed to analyze the macroscopic spray development and atomization performance of urea-water-solution. For the urea injector, the deformation of the spray head does not appear to be significant because it operates at a low pressure conditions, and the liquid core and primary droplet are observed throughout the operating conditions. No increase in atomization is seen when the operating pressure is increased, and the spray develops linearly due to poor atomization characteristics. The macroscopic spray behavior of the low-pressure urea injector is predictable through the modification of the Hiroyasu equation.

Keywords

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Fig. 1 Experimental apparatus for spray visualization

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Fig. 3 Spray development process of urea water solution for various injection pressures

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Fig. 4 Comparisons of the experimental results and empirical equation in terms of spray tip penetration

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Fig. 6 Droplet size and velocity distribution for various injection pressures

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Fig. 7 Comparisons of mean droplet size and velocity for various injection pressures

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Fig. 2 Experimental apparatus for droplet size and velocity measurement

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Fig. 5 Comparisons of spray tomography images for various injection pressures

Table 1 Specifications of the urea injector and experimental equipment

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Table 2 Experimental conditions

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References

  1. C. A. Sharp, S. A. Howell, and J. Jobe, "The effect of biodiesel fuels on transient emissions from modern diesel engines, part I regulated emissions and performance", SAE Technical Paper0148-7191, 2000.
  2. P. F. Flynn, G. L. Hunter, R. P. Durrett, L. A. Farrell, and W. C. Akinyemi, "Minimum engine flame temperature impacts on diesel and spark-ignition engine NOx production", SAE transactions, pp. 1286-1297, 2000.
  3. R. K. Miller, W. C. Haberkamp, K. M. Badeau, Z. G. Liu, R. C. Shirk, and T. Wood, "Design, development and performance of a composite diesel particulate filter", SAE Technical Paper0148-7191, 2002.
  4. A. G. Konstandopoulos, M. Kostoglou, E. Skaperdas, E. Papaioannou, D. Zarvalis, and E. Kladopoulou, "Fundamental studies of diesel particulate filters: transient loading, regeneration and aging", SAE Technical Paper0148-7191, 2000.
  5. J. H. Johnson, S. T. Bagley, L. D. Gratz, and D. G. Leddy, "A review of diesel particulate control technology and emissions effects-1992 horning memorial award lecture", SAE transactions, pp. 210-244, 1994.
  6. T. V. Johnson, "Diesel Emission Control in Review", SAE Technical paper, 2008-01-0069, 2008.
  7. J. Gieshoff, A. Schafer-Sindlinger, P. C. Spurk and J. A. A. van den Tillaart and G. Garr, "Improved SCR Systems for Heavy Duty Applications", SAE Technical paper, 2000-01-0189, 2000.
  8. J. Oh, K. Kim and K. Lee, "Spray characteristics of four-hole injectors used for a hydrocarbon lean nitrogen oxide catalyst system in a diesel engine", Proceedings of the Institute of Mechanical Engineers, Part D: Journal of Automobile Engineering, Vol. 226, No. 8, 2011, pp.1073-1087.
  9. J. Oh and K. Lee, "Spray characteristics of a urea solution injector and optimal mixer location to improve droplet uniformity and NOx conversion efficiency for selective catalytic reduction", Fuel, Vol. 119, 2014, pp. 90-97. https://doi.org/10.1016/j.fuel.2013.11.032
  10. N. V. Vuuren and H. Sayar, "High Speed Video Measurements of a Heated Tip Urea Injector Spray", SAE Technical paper, 2012-01-1747, 2012.
  11. N. V. Vuuren and J. Qin, "High Speed Video Measurements with Water of a Planar Laser Illuminated Heated Tip Urea Injector Spray", SAE Technical paper, 2013-01-1073, 2013.
  12. L. Hua, Y.-g. Zhao, J. Hu, T. Tao, and S.-J. Shuai, "Comparison between air-assisted and airless urea spray for diesel SCR system by PDA and CFD", SAE Technical Paper0148-7191, 2012.
  13. H. Hiroyasu and M. Arai, "Structures of Fuel Sprays in Diesel Engines", SAE Technical paper, 900475, 1990.