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| Analysis of spray′s breakup and atomization of elliptical diesel nozzle under high injection pressure |
| School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang， Jiangsu 212013, China |
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Abstract The large eddy simulation (LES) and the volume of fluid (VOF) model were coupled to investigate the mechanisms of spray axis-switching phenomenon and breakup process for elliptical orifice at different high injection pressures of 120, 140 and 160 MPa with fixed backpressure of 3 MPa. The effects of primary breakup process on the macro spray were analyzed based on the macro spray tests of circular and elliptical diesel nozzles. The results show that the elliptical orifice undergoes the axis-switching phenomenon even under high injection pressure, and the number of axis-switching phenomena is increased with the increasing of injection pressure. The injection pressure has little effect on the primary elliptical spray liquid core length, while the increasing of injection pressure is helpful to accelerate the liquid core breakup into small droplets.With the increasing of injection pressure, the more vortex structures which promote the formation of spray mushroom-like structures are generated at the spray head. Considering with the characteristics of primary elliptical spray, the turbulence of primary elliptical spray is improved by the increasing of injection pressure, which is helpful to intensify the instability of primary breakup process and improve the quality of macro spray.
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Received: 28 February 2020
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2021, Vol. 42 
