液体燃料静电雾化影响规律数值研究

Numerical Simulation on the Electrostatic Atomizing of Liquid Fuel

利用FLUENT软件,对雾化器腔室内部流场进行模拟计算,研究了同轴气体流速对气体流型的影响,得到了该结构下流场的稳定域。在这种稳定域条件下,对液体输运特征进行计算。模拟电压对泰勒锥演变的影响和电压、液体表面张力、液体粘性对液滴二次破碎的影响。结果表明,电场强度改变,泰勒锥的形状会发生改变。电压为2000V、3000V、5000V条件下,在一定范围内提高电场强度可以明显减小液滴平均粒径。在2000V电压下,降低液体的表面张力可以显著降低液滴平均粒径;液体粘性对形成的液体平均粒径没有太大影响。

FLUENT software was used to simulate the flow field inside the nebulizer chamber. The effects of gas velocity coaxial on gas flow pattern were studied. We got a steady flow field region of the structure. Under the stable region conditions,the liquid transport characteristics were simulated. The influence of voltage on the evolution of the Taylor cone and the influence of voltage,surface tension,viscosity on the droplets were simulated. The results showed that when the electric field intensity changed,the shape Taylor cone would change. It was found that,at 2000 v,3000v,5000 v,improving the electric field intensity could significantly reduce the average particle diameter of the droplets within a certain range. The average particle size was significantly reduced by reducing the surface tension of the liquid droplets at 2000 v.Furthermore,the viscosity of liquid had little impact on the average particle diameter.