ID 163

Experimental Study on Spray Characteristics of the Internal Oscillating Nozzle

 

Abstract:

In this paper, an open atomization test bench based on high-speed Schlieren and Malvern particle size analyzer was developed. The effects of different injection pressure, from 0.12MPa to 0.24MPa, on the spray characteristics of an internal oscillating nozzle were investigated, including the spatial distribution of flow, the oscillating frequency, the spray cone angle and the spatial distribution of spray particle size. The results show that: The whole spray presents a fan shape with small flow in the middle and large distribution on both sides. Under the condition of fixed injection pressure, with the development of spray, the flow in the middle region decreases and tends to be uniform, and the peak value of flow on both sides gradually decreases. At 250 mm from the nozzle orifice, the flow distribution reaches a steady state. When the distance from the nozzle orifice is constant, the flow rate gradually increases with the increase of pressure and reaches the maximum at 0.24MPa. With the increase of injection pressure, the oscillating frequency increases gradually and its maximum growth rate occurs when the injection pressure increases from 0.15MPa to 0.18MPa. The spray cone angle does not change with injection pressure and maintains at 41.8° near. There is a critical injection pressure of 0.16MPa. The droplet size increases with the increase of injection pressure when the injection pressure is lower than 0.16MPa. On the contrary, the droplet size decreases with the increase of injection pressure when the injection pressure is higher than 0.16MPa.