Journal of Applied and Computational Mechanics

Investigation the effects of injection pressure and compressibility and nozzle entry in diesel injector nozzle’s flow

Document Type : Research Paper

Authors

Shahid Rajaee Teacher Training University (SRTTU) Lavizan, Tehran, Iran

Abstract

Investigating nozzle’s orifice flow is challenging both experimentally and theoretically. This paper focuses on simulating flow inside diesel injector nozzle via Ansys fluent v15. Validation is performed with experimental results from Winkhofler et al (2001). Several important parameters such as mass flow rate, velocity profiles and pressure profiles are used for this validation. Results include the effects of contraction inside nozzle’s orifice, effect of compressibility; effect of injection pressures and several orifice entries are also simulated in this study. To consider the effect of compressibility, a user defined function used in this simulation. The Cavitation model which is used in this simulation is Singhal et al. (2002) cavitation model. Presto discretization method is used for Pressure equation and second upwind discretization method is used for Momentum equation. Converging Singhal et al. cavitation model is very challenging and it needs several efforts and simulations.

Keywords

Main Subjects

[1]     PHD thesis. Daniele Liuzzi, 2012.” Two-Phase Cavitation Modelling”. UNIVERSITY OF ROME - LA SAPIENZA -
[2]     Faeth, G. M. and Hsiang, L-P and Wu, P-K, 1995. “Structure and Breakup Properties of Sprays”. International Journal of Multiphase Flow, 21, pp. 99–127.
[3]     Sato, K. and Saito, Y. (2001) Unstable cavitation behaviour in circular-cylindrical orifice flow. Proc. of the 4th Int. Symposium on Cavitation: CAV2001, 8 p.
[4]     Stinebring, D.R., Billet, M.L., Lindau, J.W. and Kunz, R.F. (2001) Developed cavitation-cavity dynamics. VKI Lecture Series on Supercavitating Flows. VKI Press, Brussels, 2001, 20 p.
[5]     Bergwerk, W. (1959) Flow Pattern in Diesel Nozzle Spray Holes. Proc. Inst. Mech Engrs., 1959, Vol.173, pp. 655 – 660.
[6]     Winklhofer, E., Kull, E., Kelz, E., Morozov, A. (2001) Comprehensive hydraulic and flow field documentation in modl throttle experiments under cavitation conditions. Proceedings of the ILASS-Europe Conference, Zurich, 2-6 September, 2001, pp. 574 – 579.
[7]     PHD thesis.SERGEY MARTYNOV (2005).” Numerical Simulation of the Cavitation Process in Diesel Fuel Injectors”.
[8]     Ansys Fluent v14 Documentation.
[9]     Singhal, A.K., Athavale, M.M., Li, H., Jiang Yu (2002) Mathematical basis and validation of the full cavitation model. Tr. ASME, J. Fluid Eng., Vol.124, pp. 617 – 624.
[10] Han, J. S., Lu, P. H., Xie, X. B., Lai, M. C., and Henein, N. A., 2002, “Investigation of Diesel Spray Break Up and Development for Different Nozzle Geometries,” SAE Paper No. 2002-01-2775.
[11] Menter F R. Two-Equation eddy-viscosity turbulence models for engineering applications [J]. AIAA Journal, 1994, 32(8): 1598-1605.
[12] Hinze, J. O., 1975, Turbulence, 2nd Ed. McGraw Hill, New York.
[13] X.margot, S.Hoyas, A.Gil,,S.Patouna, 2012.”Numerical modelling of cavitation:validation and parametric studies”. Engineering application of computional fluid mechanics Vol 6, No. 1, pp. 15-24.
[14] Naber, J. D., and Siebers, D. L., 1996, “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays,” SAE Paper No. 960034.
[15] Spikes, R.H., and Pennington, G.A. (1959) Discharge coefficient of small submerged orifices. Proc. Inst. Mech. Engineers, pp. 661 – 674.
[16] Nurick, W.H. (1976) Orifice cavitation and its effect on spray mixing. J. Fluids Engng., 98, pp. 681 – 689.
[17] Hiroyasu, h. (2000) Spray breakup mechanism from the hole-type nozzle and its applications. Atomization and Sprays, Vol.10, pp. 511-527.
[18] Laoonual, Y., Yule, A.J, and Walmsley, S.J. (2001). Internal fluid flow and spray visualization for a large-scale VCO orifice injector nozzle. ILASS-Europe 2001, Zurich 2-6 September, 2001. 6 p.
[19] Blessing, M., Konig, G., Kruger, C., Michels, U., and Schwarz, V. (2003) Analysis of flow and cavitation phenomena in Diesel injection nozzles and its effects on spray and mixture formation. SAE paper 2003-01-1358, pp. 29 – 39.
[20] Benajes, J., Pastor, J.V., Payri, R. and Plazas, A.H. (2004) Experiments for the different values of K-factor. J. Fuids Engineering, Vol.126, p. 63.
Journal of Applied and Computational Mechanics
Volume 1, Issue 2 - Serial Number 2
May 2015
Pages 83-94