Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Experiment Study on the Spray Characteristics according to the Design Factors and SMD Measuring Direction of Y-jet Nozzle

Y-jet 노즐의 설계인자와 SMD 측정방향에 따른 분무특성의 실험 연구

  • 이상지 (경북대학교 기계공학과) ;
  • 홍정구 (경북대학교 기계공학과)
  • Received : 2018.11.09
  • Accepted : 2018.12.13
  • Published : 2018.12.30
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Abstract

Y-jet nozzle has various advantages over other twin-fluid nozzles and are used in industrial boilers. However, it costs large energy consumption because of assisted air and its design is complex. The Y-jet nozzle is consisted of a liquid and gas port and a mixing chamber. The diameter of the port and the length of the mixing chamber greatly affect spray and atomization characteristics, therefore, they are the most important factors in nozzle design. In this study, The experimental setup is consisted of a laboratory scale spray system. The characteristics of the Y-jet nozzle according to the design parameters were observed. As a result, it was found that the length of the mixing chamber did not have effect on the flow rate and the choking condition. The droplet size was measured using a Malvern type measuring device. In addition, measurements were conducted in the front and the right directions of the nozzles. Based on the results, the SMD View Ratio is defined. It is the asymmetrical design characteristics of the Y-jet nozzle.

Keywords

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Fig. 1 Schematic diagram of the Y-jet nozzle

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Fig. 2 Schematic diagram of the experimental setup for measurement of spray characteristics

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Fig. 4 Air mass flowrate according to liquid pressure

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Fig. 5 SMD according to ALR

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Fig. 6 SMD according to liquid pressure

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Fig. 8 SMD according to liquid pressure in da/dw ratio and measuring direction (Air pressure 2 bar fixed)

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Fig. 3 Schematic diagram of the SMD measuring direction

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Fig. 7 SMD according to liquid pressure in mixing chamber length and measuring direction (Air pressure 2 bar fixed)

Table 1 Nozzle specification

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Table 2 Experimental conditions

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Table 3 SMD view ratio

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References

  1. 이상용, 액체의 미립화, 민음사, 1996.
  2. C. W. Lee, Y. J. Lee, J. W. Park, and K. Terasima, "Effect of nozzle hole configuration on spray characteristics for diesel engine", 10th Annual Conf. on Liquid Atomization and Spray Systems, Seoul, Korea, 2005, pp. 267-272.
  3. A. R. Jones, "Design optimization of a large pressure jet atomizer for power plant", International Conference on Liquid Atomization and Spray System, 1982, pp. 181-185.
  4. P. S. Kutty, M. V. Narasimhan, and K. Narayansway, "Design and prediction of discharge rate, cone angle and air core diameter of swirl chamber atomizers", International Conference on Liquid Atomization and Spray System, 1978, p. 93.
  5. S. D. Sovani, P. E. Sojka and A. H. Lefebvre, "Effervescent atomization", Progress in Energy and Combustion Science, Vol. 27, 2001, pp. 483-521. https://doi.org/10.1016/S0360-1285(00)00029-0
  6. A. H. Lefebvre, "Atomization and Spray", Hemisphere publishing corporation, 1989, pp. 201-307.
  7. 구건우, 홍정구, "타원형 노즐의 내부유동 구조가 액주분열에 미치는 영향", 한국액체미립화학회지 제18권 1호, 2013, pp. 44-54. https://doi.org/10.15435/JILASSKR.2013.18.1.044
  8. 송시홍, 이상용, "Y-jet 노즐에서의 혼합관 길이변화에 따른 분무특성 연구", 대한기계학회논문집 제18권 제11호, 1994, pp. 3021-3031. https://doi.org/10.22634/KSME.1994.18.11.3021
  9. P. J. Mullinger, and N. A. Chigier, "The Design and Performance of Internal Mixing Multijet Twin Fluid Atomizers", Journal of the Institute of Fuel, Vol. 47, 1974, pp. 251-261.
  10. K. S. L. Prasad, "Spray Characterization of Air Blast Atomisers", Proc. ICLASS-82, 1982, pp. 123-130.
  11. P. Andreussi, L. Tognotti, G. De michele, and M. Graziadio, "Design and Characterization of Twin-Fluid Yjet Atomizers", Atomization and Sprays, Vol. 2, 1992, pp. 45-59. https://doi.org/10.1615/AtomizSpr.v2.i1.40
  12. 송시홍, 이상용, "Y-jet 노즐을 통한 저점도 액체의 유량 및 입경예측에 관한 연구", 대한기계학회논문집 제18권 제12호, 1994, pp. 3377-3385. https://doi.org/10.22634/KSME.1994.18.12.3377
  13. 구건우, 홍정구, 박철우, 이충원, "원형 및 타원형 노즐 내부유동과 외부유동의 상관관계", 대한기계학회논문집 B권 제36권 3호, 2012, pp. 325-333.
  14. 윤현진, 홍정구, 구건우, 석지권, 정경열, "이유체 노즐 미립화 특성이 요소 열분해에 미치는 영향", 한국액체미립화학회지 제20권 3호, 2015, pp. 162-167. https://doi.org/10.15435/JILASSKR.2015.20.3.162