DOI QR코드

DOI QR Code

인젝터 압력이 단공노즐 감압비등 분무에 미치는 영향

Effect of Injection Pressure on the Flash Boiling Spray from Simple Orifice Nozzle

  • 이현창 (경남대학교 기계공학부) ;
  • 차현우 (경남대학교 기계융합공학과) ;
  • 강동현 (경남대학교 기계융합공학과)
  • 투고 : 2022.02.28
  • 심사 : 2022.03.11
  • 발행 : 2022.03.31

초록

Flash boiling occurs in a couple of modern engineering systems and understanding its mechanism is important. In this experimental study, discharge coefficient of flash boiling spray from simple orifice nozzle was measured, and backlight imaging was acquired at injection pressure to 6.0 bar and temperature to 163℃ for the purpose. Pressurized water by pump was used for working fluid and was heated by electric heater and ejected through simple orifice nozzle diameter of 0.5 mm. High speed camera with long distance microscope was used for backlight imaging in two FoV having magnification of 3.3 and 0.64. The decrease of discharge coefficient according to degree of superheating and evolution of flash boiling spray imaged at various pressure and temperature were explained by the pressure field inside the injector.

키워드

과제정보

이 논문은 국방기술품질원의 방산혁신클러스터 지원 사업(DCL2020L)의 지원을 받아 수행된 연구임.

참고문헌

  1. 이상용, "액체의 미립화", 주) 민음사, 1996, pp. 209~220.
  2. R. D. Oza, "On the Mechanism of Flashing Injection of Initially Subcooled Fuels", Journal of Fluids Engineering, Vol. 106, No. 1, 1984, pp. 105~109. https://doi.org/10.1115/1.3242383
  3. B. S. Park and S. Y. Lee, "An experimental investigation of the flash atomization mechanism", Atomization and Sprays, Vol. 4, No. 2, 1994.
  4. E. Sher, T. Bar-Kohany and A. Rashkovan, "Flash-boiling atomization", Progress in Energy and Combustion Science, Vol. 34, No. 4, 2008, pp. 417~439. https://doi.org/10.1016/j.pecs.2007.05.001
  5. V. Cleary, P. Bowen and H. Witlox, "Flashing liquid jets and two-phase droplet dispersion", Journal of Hazardous Materials, Vol. 142, No. 3, 2007, pp. 786~796. https://doi.org/10.1016/j.jhazmat.2006.06.125
  6. G. Lamanna, H. Kamoun, B. Weigand and J. Steelant "Towards a unified treatment of fully flashing sprays", International Journal of Multiphase Flow, Vol. 58, 2014, pp. 168~184. https://doi.org/10.1016/j.ijmultiphaseflow.2013.08.010
  7. O. F. Atac, S. Moon and J. Jeon, "Unraveling the initial flash boiling spray formation at the same superheated index achieved by altering ambient pressure and fuel temperature independently", International Journal of Heat and Mass Transfer, Vol. 169, 2021, pp. 120897. https://doi.org/10.1016/j.ijheatmasstransfer.2020.120897
  8. H. J. Lee, Y. Jin, H. Choi and K. Hwang, "Hydraulic characterization of high temperature hydrocarbon liquid jets", The International Journal of Heat and Fluid Flow, Vol. 65, 2017, pp. 166~176. https://doi.org/10.1016/j.ijheatfluidflow.2017.04.007
  9. I. H. Bell, J. Wronski, S. Quoilin and V. Lemort, "Pure and Pseudo-pure Fluid Thermophysical Property Evaluation and the Open-Source Thermophysical Property Library CoolProp", Industrial & Engineering Chemistry Research, Vol. 53, No. 6, 2014, pp. 2498~2508. https://doi.org/10.1021/ie4033999