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针对传统高压水射流清洗耗水量大,能耗和运营费用高、清洗后的废液需要处理才能达到环保要求的缺陷,提出了新型射流清洗方式—气溶性射流.对新型气溶性射流喷嘴进行了结构设计,得到了喷嘴混合室直径、喉部直径、出口直径、收缩段长度以及扩张段长度等关键参数,并对新型喷嘴内外气液二相流场进行了深入计算与分析.结果表明,气液二相流雾滴在喷嘴轴线上速率随气流入口压力增大而增大,在喷嘴喉部速率变化率最大,在喷嘴出口处速率达到最大;当扩散角为10°时,射流扩散较慢,内部扰动和摩擦损失较小;当收缩角为30°时,气液二相流流动性较好,能量损失较小;粒径较小雾滴沿轴线方向速率变化较大,当喷射距离为35mm时,气液二相流雾滴速率达到最大值.
Aiming at the defect that traditional high-pressure water jet cleaning has large water consumption, high energy consumption and high operating cost, and the waste liquid after cleaning needs to be processed to achieve the environmental protection requirements, a new type of jet cleaning method, namely aerosol jet, is proposed. Structure design, the key parameters such as nozzle diameter, diameter of throat, exit diameter, length of contraction section and length of expansion section were obtained, and the gas-liquid two-phase flow field inside and outside the new nozzle was calculated and analyzed.The results show that gas The rate of liquid two-phase flow droplets on the axis of the nozzle increases with the increase of the pressure at the inlet of the gas flow, and the rate of change at the throat of the nozzle is the maximum, reaching the maximum at the exit of the nozzle. When the diffusion angle is 10 °, , The internal perturbation and the frictional loss are small. When the shrinking angle is 30 °, the gas-liquid two-phase flow has better fluidity and less energy loss. The smaller the diameter of the droplets, the larger the velocity along the axial direction. When the jetting distance is 35mm, the gas-liquid two-phase flow rate reached the maximum.