Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Macroscopic Visualization of Diesel Sprays with respect to Nozzle Hole Numbers and Injection Angles

분공수와 분사각의 영향에 따른 거시적 디젤 분무 가시화

  • 정용진 (한국에너지기술연구원 에너지효율연구본부) ;
  • 장진영 (한국과학기술원 기계공학과) ;
  • 배충식 (한국에너지기술연구원 에너지효율연구본부)
  • Received : 2024.03.07
  • Accepted : 2024.03.20
  • Published : 2024.03.31
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Abstract

Macroscopic visualization of non-evaporating sprays was experimentally conducted to investigate spray tip penetration and spray angle under low-density conditions, corresponding to an early injection strategy. Furthermore, injectors with varying injection angles (146° and 70°) and numbers of holes (8 and 14) were employed to examine the impact of injector configuration. Compared to the baseline injector, 8H146, which has 8 holes and a 146° injection angle, the spray tip penetration of the 8H70 injector was found to be longer. This can be attributed to higher momentum due to a smooth flow field between the sac volume and the nozzle inlet, which is located closer to the injector tip centerline. The increase in velocity led to intense turbulence generation, resulting in a wider spray angle. Conversely, the spray tip penetration of the 14H70 injector was shorter than that of the 8H70 injector. The competition between increased velocity and decreased nozzle diameter influenced the spray tip penetration for the 14H70 injector; the increase in momentum, previously observed for the 8H70 injector, contributed to an increase in spray tip penetration, but a decrease in nozzle diameter could lead to a reduction in spray tip penetration. The spray angle for the 14H70 injector was similar to that of the 8H146 injector. Moreover, injection rate measurements revealed that the slope for a narrow injection angle (70°) was steeper than that for a wider injection angle during the injection event.

Keywords

Acknowledgement

이 연구는 산업통상자원부 한국산업기술평가관리원 지원(10033440)으로 수행되었으며, 이에 깊은 감사를 표합니다.

References

  1. T. V. Johnson, Diesel Emission Control in Review - The Last 12 Months, SAE 2003-01-0039, 2003.
  2. F. F. Zhao, T. W. Asmus, D. N. Assanis, J. E. Dec, J. A. Eng and P. M. Najt (eds.), Homogeneous charge compression ignition (HCCI) Engines: Key Research and Development Issues, Chap. 2, Society of Automotive Engineers, Inc., 2003.
  3. Y. Iwabuchi, K. Kawai, T. Shoji and Y. Takeda, Trial of new concept diesel combustion system - Premixed compression-Ignited combustion, SAE Transactions, Vol. 108, 1999, pp. 142~151.
  4. H. Akagawa, T. Miyamoto, A. Harada, S. Sasaki, N. Shimazaki, T. Hashizume and K. Tsujimura, Approaches to solve problems of the premixed lean diesel combustion, SAE Transaction, Vol. 108, 1999, pp. 120~132.
  5. B. Walter and B. Gatellier, Development of the High Power NADITM Concept using dual mode diesel combustion to achieve Zero NOx and Particulate Emissions, SAE 2002-01-1744, 2002.
  6. H. Hiroyasu and M. Arai, Structures of Fuel Sprays in Diesel Engines, SAE, 1990, pp. 900475.
  7. F. Payri, R. Payri, F. J. Salvador and J. Gimeno, Influence of nozzle geometry on spray characteristics in non-evaporative and evaporative conditions, SAE Transaction, Vol. 116, 2007, pp. 1483~1494.
  8. C. Arcoumanis, M. Gavaises, J. M. Nouri, E. Abdul-Wahab and R. W. Horrocks, Analysis of the Flow in the Nozzle of a Vertical Multi-Hole Diesel Engine Injector, SAE Transaction, Vol. 106, 1998, pp. 1245~1259.
  9. M. Blessing, G. Konig, C. Kruger, U. Michels and V. Schwarz, Analysis of Flow and Cavitation Phenomena in Diesel Injection Nozzles and Its Effects on Spray and Mixture Formation, SAE Transaction, Vol. 112, 2003, pp. 1694~170 .
  10. J. Dent, A Basis for the Comparison of Various Experiment Methods for Studying Spray Penetration, SAE, 1971, pp. 710571.