Investigation on the Influence of Injection Pressure and Nozzle Diameter on the Spray of Blended Fuel in Diesel Engine

Injection parameters such as injection pressure and nozzle diameter were investigated using the planar laser induced fluorescence technique.Results show that,at the same injection pressure,high volatile fuel gives long spray penetration and large spray cone angle(far field and the near field).With the increase of injection pressure,spray angle increases and penetration distance shows a linear growth,while the effect of volatility of blended fuel on penetration distance is decreased.During the spray development,the near-field cone angle shows a first decreasing and later maintains a constant value.The far-field spray cone angle shows a first decreasing and then keeps constantly and later a increasing.Generally,the variation of the far-field spray angle is small.For the same nozzle diameter,high volatile fuel gives long penetration distance and large cone angle.When decreasing nozzle diameter from 0.18,mm to 0.10,mm,the effect of volatility on the growth rate of spray cone angle is decreased.With the increase of nozzle diameter,penetration distance shows a linear growth.The effect of nozzle diameter on the far-field spray cone angle is larger than on the near-field spray cone angle.