Influence of Collision Angle Micro-deviation of Symmetric Nozzles on Collision Atomization Characteristics

Abstract

The large-scale high-precision machining of the nozzles in the collision atomizer is quite difficult. The slight deviation of the nozzle inclination causes the collision angle to change doubly, which affects the collision position and the spatial distribution of the atomized droplets and reduces the combustion efficiency of the combustion chamber. In order to improve the atomization performance of the dual jet collision atomizer, this study firstly investigates the influence of the collision angle micro-deviation on the atomization characteristics based on the laser interference particle measurement technology (IPI). To jointly study the real-time characteristics of the internal flow and atomization field, a collision atomizer with transparent nozzles is independently designed, and the collision angle is controlled by a high-precision rotary stage. The cavitation phenomenon in the internal flow field is analyzed by simulation and experiment. The hydraulic parameters and atomization performance of the collision atomization field are measured and analyzed. The experimental results show that under the same injection pressure, the increase of the collision angle leads to the decrease of the Sauter Mean Diameter (SMD) and the increase of the atomization cone angle. Taking 60° as the benchmark, within the variation range of ± 5°, the collision angle deviation has little effect on the spatial distribution of atomized droplets.