新型旋切式气液两相喷嘴及内部流场数值模拟

本文在对各种气动性喷嘴及其雾化机理分析的基础上提出一种新型雾化喷嘴--旋切式气液两相喷嘴。该喷嘴具有结构简单、喷雾量无限可调、喷雾锥角调整灵活、防堵塞、雾化效果好的优点。通过CFD数值模拟研究发现,在旋切式喷嘴内部液流已经被气流剪切雾化成细小颗粒,其均匀的分散在气流中,在混合室内部形成气液混合流,形成一次雾化。当气液混合流脉冲喷出孔喷时,体积进一步膨胀,同时,高速液滴外部空气相互作用,产生二次雾化,促进了雾化效果。

A NEW TYPE OF ROTARY TWO-PHASE NOZZLE OF ITS INTERNAL FLOW NUMERICAL SIMULATION

Based on various aerodynamic nozzle and its atomization mechanism analysis ,this article presents a new type of atomizer. This atomizer has many advantages, such as it has a simpler structure, infinitely- tunable mist flux and the spray angle can be adjustment flexible. Through numerical simulation, the study had founded that the liquid have been turned droplets which flowing with the airflow inside of the nozzle. This formed the first atomization. Then, the gas-liquid flow bulked when spouting out from the jet orifice. Under the external air interactions, the droplets formed a second atomization which promoted the atomization ef- fects.