In order to further understand the mechanism of breakup of diesel jet,a mathematical model of fuel flow in self-excited oscillating nozzle was built based on large eddy simulation(LES)and Volume of Fluid(VOF)model.The results show that fluid vorticity and disturbance intensity in the self-excited oscillating nozzle is significantly increased,and it can increased by more than three times.The disturbance intensity is more sensitive to jet breakup in the near-nozzle region,which can significantly improve the jet breakup effect.The jet breakup length(SL)is greatly reduced,which can varies from 2 to 5 times of the outlet diameter at near-nozzle region.At the same time,the spray cone angle in the near-nozzle area is also increased,which can increase by more than 60%.The fuel jet atomization effect is greatly improved in the self-excited oscillating nozzle.The numerical simulation results is also provided a strong theoretical basis for the self-oscillating pulsed atomizing nozzle.
关键词
能源动力工程/自激振荡喷嘴/喷雾特性/射流破碎机理/湍流扰动
Key words
energy and power engineering/self-excited oscillating nozzle/atomization characteristic/breakup mechanism of jet/turbulence perturbation
维普
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