Numerical Simulation of Transient Flow Inside Nozzle on Gasoline Direct Injection Engine

Abstract:

To achieve transient flow characteristics at exit of nozzle orifice on gasoline direct injection engine, two phase Euler-Euler schemes was used to simulate the internal flow of the swirl nozzle. Different flow characteristics were calculated in the simulation. Different kinds of nozzle configuration were studied. Cavitaion and swirl flow occured in the nozzles. Injection hole configuration matters more than area variation of swirl tangential slot to discharge coefficient of the studied nozzle. Discharge coefficient changes a little along the injection hole length. The area of the swirl tangrntial slot plays an important throttling action in nozzle internal flow. Smaller area of swirl tangential slot generates larger degree cavitation but smaller mean injection velocity. Turbulence kinetic energy changes with the time of cavitation and swirl field occurring and the nozzle configuration. Before the appearance of cavitation, smaller inclination angle of orifice can generate more turbulence kinetic energy. After that moment, turbulence kinetic energy varies with different configuration. Along injection hole length, turbulence kinetic energy obviously varies. These flow characteristics affect primary atomization and will be as input for next spray simulation. They are also applied to design reference for injection nozzle.

• Periodical: Advanced Materials Research (Volumes 466-467)
• Pages: 1237-1241
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.466-467.1237
• Online since: February 2012
• Authors: Yan Hua Wang, Shi Chun Yang, Yun Qing Li
• Keywords: Cavitation, Discharge Coefficient, Fluid Phase Volume Fraction, Swirl Nozzle, Turbulence Kinetic Energy, Two-Phase Flow

References

[1] Y. Iwamoto, K. Noma, O. Nakayama, T. Yamauchi, and H. Ando: Development of Gasoline Direct Injection Engine, SAE Paper 970541(1997).

DOI: 10.4271/970541

[2] U. Spicher, J. Reissing, J.M. Kech, and J. Gindele: Gasoline direct injection engines–development potentialities, SAE Paper 1999-01-2938(1999).

DOI: 10.4271/1999-01-2938

[3] Sung Wook Park, Hyung Jun Kim and Chang Sik Lee: Experimental analysis and numerical modeling using lisa-ddb hybrid breakup model of direct injected gasoline spray, Journal of Mechanical Science and Technology, vol. 17(2008), pp.1812-1819.

DOI: 10.1007/bf02983612

[4] Young-Sam Shim, Gyung-Min Choi and Duck-Jool Kim: Numerical and experimental study on hollow-cone fuel spray of high pressure swirl injector under high ambient pressure condition, Journal of Mechanical Science and Technology, vol. 22 (2008).

DOI: 10.1007/s12206-007-1044-3

[5] Sangseung Lee, Wonho Kim and Woongsup Yoon: Spray formation by a swirl spray jet in low speed cross-flow, Journal of Mechanical Science and Technology, vol. 22(2010), pp.559-568.

DOI: 10.1007/s12206-009-1222-6

[6] Graham Hargrave and Yong Khoo: In-nozzle and spray diagnostic techniques for real sized pressure swirl and plain orifice, SAE Paper, 2003-01-3151(2003).

DOI: 10.4271/2003-01-3151

[7] M. Gavaises, E. Abo-serie and C. Arcoumanis: Nozzle hole film formation and its link to spray characteristics in swirl-pressure atomizers for direct injection gasoline engines, SAE Paper 2002-01-1136(2002).

DOI: 10.4271/2002-01-1136

[8] Rizk, N.K., Lefebvre, A.H.: Internal flow characteristics of simplex swirl atomizers, Journal of Propulsion and Power, Vol. 1, (1985), pp.193-199.

DOI: 10.2514/3.22780

[9] Suyari, M., Lefebvre A.H.: Film thickness measurements in a simplex swirl atomizers, Journal of Propulsion, Vol. 2 (1986), pp.528-533.

DOI: 10.2514/3.22937