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Investigation of Cavitation in a Vertical Multi-Hole Injector
Technical Paper
1999-01-0524
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An enlarged transparent model of a six-hole vertical diesel injector has been used to allow visualization of the flow at Reynolds and cavitation numbers matching those of real size injectors operating under normal Diesel engine conditions. The visualization system comprised a CCD camera, high-magnification lenses and a spark light source which allowed high-resolution images to be obtained. The flow conditions examined in terms of flow rates and pressures covered the range from low to full load of the real size injector while the needle lift position corresponded to that of full lift of the first- and second- stage in two-stage injectors. In addition, different values of needle eccentricity were tested in order to examine its effect on the cavitation structures within the injection holes.
From this investigation two different types of cavitation were identified: cavitation originating at the entrance to the injection holes and cavitation strings formed inside the sac volume and linking adjacent holes. In the former case, the flow pattern mainly depended on the cavitation rather than the Reynolds number as well as on the needle eccentricity. Different types of cavitation structure were identified varying from incipient bubbly flow to plug-type cavitation films and fully separated flow. In addition to hole cavitation, cavitation strings were found to form transiently inside the sac volume. As these cavitation strings were convected by the mean flow towards the injection holes, they were interacting transiently with the pre-existing cavitation structures resulting in a rather chaotic hole flow pattern. Since this phenomenon was found not to occur simultaneously in all injection holes, transient differences in the flow exiting the different injection holes were observed.
Overall, the results revealed that the flow development in multi-hole vertical nozzles, despite the axisymmetric geometry, may lead to hole-to-hole flow variations as a result of the transient nature of the cavitating structures formed inside the sac volume and holes.
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Citation
Arcoumanis, C., Flora, H., Gavaises, M., Kampanis, N. et al., "Investigation of Cavitation in a Vertical Multi-Hole Injector," SAE Technical Paper 1999-01-0524, 1999, https://doi.org/10.4271/1999-01-0524.Also In
References
- Boehner W. Hummel K. “Common rail injection system for commercial Diesel vehicles” SAE Paper 970345 1997
- Guerrasi N. Dupraz P. “A common rail injection system for high speed direct injection Diesel engines” SAE Paper 980803 1998
- He L. Ruiz F. “Effect of cavitation on flow and turbulence in plain orifices for high speed atomization” Atomization and Sprays 5 569 584 1995
- Tamaki N. Shimizu M. Nishida K. Hiroyasu H. “Effects of cavitation and internal flow on atomization of a liquid jet” Atomization and Sprays 8 179 197 1998
- Zhen H. Yiming S. Shiga S. Nakamura H. Karasawa T. “The orifice flow pattern, pressure characteristics, and their effects on the atomization of fuel containing dissolved gas” Atomization and Sprays 4 123 133 1994
- Park B.S. Lee S.Y. “An experimental investigation of the flash atomization mechanism” Atomization and sprays 4 159 179 1994
- Santangelo P.J. Sojka P.E. “A holographic investigation of the near - nozzle structure of an effervescent atomizer - produced spray” Atomization and sprays 5 137 155 1995
- Arcoumanis C. Gavaises M. “Linking nozzle flow with spray characteristics in a diesel fuel injection system” Atomisation and Sprays 8 307 347 1998
- Arcoumanis C. Gavaises M. French V. “Effect of fuel injection processes on the structure of Diesel sprays SAE Paper 970799 1997
- Chaves H. Bode J. Hentschel W. Kubitzek A. Obermeier F. Schindler K.P. Schneider T. “Fuel spray in Diesel engines Part I: spray formation” Proceedings of the 3 rd Int. Conf. Innovation and Reliability in Automotive Design and Testing, paper 2.6.2 1995
- Arcoumanis C. Nouri J.M. Andrews R.J. “Application of refractive index matching to a diesel nozzle internal flow” Proc. IMechE Seminar on Diesel Fuel Injection Systems April 14-15 1992
- Arcoumanis C. Gavaises M. Nouri J.M. Wahab E. Horrocks R. “Analysis of the flow in the nozzle of a vertical multi-hole Diesel engine injector” SAE Paper 980811 1998
- Date K. Nobechi H. Kano H. Kato M. Oya T. “Experimental analysis of fuel flow characteristics in the nozzle for direct injection engines” SAE Paper 931002 1993
- Hiroyasu H. Arai M. Shimizu M. “Break-up length of a liquid jet and internal flow in a nozzle” ICLASS-91 Gaithersburg, MD, U.S.A. July 1991
- Kato M. Kano H. Date K. Oya T. Niizuma K. “Flow analysis in nozzle hole in consideration of cavitation” SAE Paper 970052 1997
- Kim J-H. Nishida K. Yoshizaki T. Hiroyasu H. “Characterization of flows in the sac chamber and the discharge hole of a DI Diesel injection nozzle by using a transparent model nozzle” SAE Paper 972942 1997
- Knox-Kelecy A.L. Farrell P.V. “Spectral characteristics of turbulent flow in a ccale model of a Diesel fuel injector nozzle” SAE Paper 930924 1993
- Soteriou C.C.E. Andrews R.J. Smith M. “Direct injection Diesel sprays and the effect of cavitation and hydraulic flip on atomization” SAE Paper 950080 1995
- Yule A.J. Dalli A.M. Yeong K.B. “Transient cavitation and separation in a scaled-up model of a VCO orifice” ILASS Conf. July 6-8 Manchester U.K. 1998
- Soteriou C. Smith M. Andrews R. “Diesel injection - laser light sheet illumination of the development of cavitation in orifices” IMechE 1998
- Badock C. Wirth R. Kampmann S. Tropea C. “Fundamental Study of the Influence of cavitation on the internal flow and atomization of Diesel sprays” ILASS Conf. July 8-10 Florence 1997
- Dan T. Yamamoto T. Senda J. Fujimoto H. “Effect of nozzle configuration for characteristics of non-reacting Diesel fuel spray” SAE Paper 970355 1997
- Chaves H. Knapp M. Kubitzek A. Obermeier F. Schneider T. “Experimental study of cavitation in the nozzle hole of Diesel injectors using transparent nozzles” SAE Paper 950290 1995
- Chaves H. Obermeier F. “Correlation between light absorption signals of cavitating nozzle flow within and outside of the hole of a transparent diesel injection nozzle” ILASS Conf. July 6-8 Manchester U.K. 1998
- Badoch H. Wirth R. Fath A. Leipertz A. “Application of laser light sheet technique for the investigation of cavitation phenomena in real size diesel injection nozzles” ILASS Conf. July 6-8 Manchester U.K. 1998
- Trevena D.H. Cavitation & tension in liquids Adam Hilger Ltd. 1987
- Knapp R.T. Daily J.W. Hammit F.G. Cavitation McGraw Hill Book Company 1970
- Minami K. Shoham O. “Transient two-phase flow behaviour in pipelines - experiment and modeling” Int. J. Multiphase Flow 20 4 739 752 1994
- Domnick J. Durst F. “Measurement of bubble size, velocity and concentration in flashing flow behind a sudden constriction” Int. J. Multiphase Flow 21 6 1047 1062 1995
- Okajima M. Kato M. Kano H. Tojo S. Katagiri M. “Contribution of optimum nozzle design to injection rate control” SAE Paper 910185 1991
- Bergwerk W. “Flow pattern in diesel nozzle spray holes” Proc. Instn. Mech Engrs 173 25 655 674 1959
- Ohrn T.R. Senser D.W. Lefebvre A.H. “Geometrical effects on discharge coefficients for plain - orifice atomizers” Atomization and Sprays 1 2 137 153 1991
- Spikes R.H. Pennington G.A. “Discharge coefficient of small submerged orifices” Proc. Inst. Mech. Eng. 173 25 661 674 1959
- Abraham F.F. Homogeneous nucleation theory Academic Press 1974
- Brennen C.E. Cavitation and bubble dynamics Oxford University Press 1995
- Carey V.P. Liquid-vapor phase-change phenomena Hemishre Publishing Corporation 1992
- Hsu Y-Y. Graham R.W. Transport processes in boiling and two-phase systems Hemisphere puplishing corporation 1976
- Stralen S. Cole R. Boiling phenomena Hemisphere Publishing Corporation 1979
- Carpenedo L. Cluti P. Iernetti G. “Cavitation nuclei distribution in liquids by tensile strength measurements” Acoustics Letters 7 4 50 55 1983
- Finkelstein Y. Tamir A. “Formation of gas bubbles in supersaturated solutions of gases in water” AIChE J. 31 9 1409 1419 1985
- Hentschel W. Zarschizky H. Lauterborn W. “Recording and automatical analysis of pulced off-axis holograms for determination of cavitation nuclei size spectra” Optics Communications 53 2 69 73 1985
- Neppiras E.A. Nolting B.E. “Cavitation produced by ultrasonics: Theoritical conditions for the onset of cavitation” Proc. Phys. Soc. 64 12-B 1032 1038 1951
- Nolting B.E. Neppiras E.A. “Cavitation produced by ultrasonics” Proc. Phys. Soc. 63 9-B 674 685 1950
- Al-Hayes R.A.M. Winterton R.H.S. “Bubble diameter on detachment in flowing liquids” Int. J. Heat Mass Transfer 24 223 230 1981
- Kenning D.B.R. Del Valle V.H.M. “Fully developed nucleate boiling: overlap of areas of infuence and interference between bubble sites” Int. J. Heat Mass Transfer 24 6 1025 1032 1981
- Mei R. Chen W. Klausner J. “Vapor bubble growth in heterogeneous boiling - I. Growth rate and thermal effects” Int. J. Heat Mass Transfer 38 5 921 934 1995
- Mei R. Chen W. Klausner J. “Vapor bubble growth in heterogeneous boiling - I. Formulation” Int. J. Heat Mass Transfer 38 5 909 919 1995
- Yang S.R. Kim R.H. “A mathematical model of the pool boiling nucleation site density in terms of the surface characteristics” Int. J. Heat Mass Transfer 31 4 1127 1135 1988
- Duraiswami R. Chahine G.L. “Analytical study of a gas bubble in the flow field of a line vortex” 135 69 76 Cavitation and Multiphase Flow Forum ASME 1992
- Lush P.A. “Cavity dynamics in a duct flow” 1983
- Nigmatulin R.I. Khabeev N.S. Nagiev F.B. “Dynamics, heat and mass transfer of vapor-gas bubbles in a liquid” Int. J. Heat Mass Transfer 24 6 1033 1044 1981
- Plesset M.S. “The dynamics of cavitation bubbles” J. Applied Mechanics 277 282 1949
- Plesset M.S. Prosperetti A. “Bubble dynamics and cavitation” Ann. Rev. Fluid Mech 9 145 185 1977
- Young F.R. Cavitation McGraw Hill Book Company 1989
- Feng Z.C. Leal L.G. “Nonlinear bubble dynamics” Ann. Rev. Fluid Mech. 29 201 243 1997
- Boulton-Stone J.M. Blake J.R. “Gas bubbles bursting at a free surface” JMF 254 437 466 1993
- Fujikawa S. Akamatsu T. “Effects of non-equilibrium condensation of vapour on the pressure wave produced by the collapse of a bubble in a liquid” JFM 97 481 512 1980
- D'Agostino L. Brennen C. “Linearized dynamics of spherical bubble clouds” JFM 199 155 176 1989
- Rubistein J. “Bubble interaction effects on waves in bubbly liquids” J. Acoust. Soc. Am. 77 6 2061 2066 1985
- Takahira H. Akamatsu T. Fujikawa S. “Some analytical aspects on the dynamics of a cluster of bubbles” IMechE 9 15 1992
- Sadhal S.S. Ayyaswamy P.S. Chung J.N. Transport phenomena with drops and bubbles Springer-Verlag New York Inc. 1997
- Clift R. Grace J.R. Weber M.E. Bubbles, drops, and particles Academic Press, Inc. 1978
- Nigmatulin R.I. Dynamics of multiphase media 1 Hemisphere Publishing Corporation New York 1991 Nauka Moscow
- Collier J.G. Thome J. Convective boiling and condensation Oxford University Press 1997
- Whalley P.B. Boiling, condensation and gas-liquid flow Clarendon Press Oxford 1987
- Ming-Chia Lai Wang T-C. Xie X. Han J-S Henein N. Schwarz E. Bryzik W. “Microscopic characterization of diesel sprays at VCO nozzle exit” SAE Paper 982542 1998
- Kim J.H. Nishida K. Hiroyasu H. “Characteristics of the internal flow in a diesel injection nozzle” ICLASS 97 Seoul 1997