结构对气泡雾化喷头临界压力的影响研究

Effect of Effervescent Nozzle Structure on Its Critical Pressure

设计了一种气泡雾化喷头,利用喷头雾化性能综合实验平台,对喷头的混合室临界压力进行了实验研究。考察了不同结构对临界压力特性的影响,对影响气泡雾化喷头混合室临界压力的各项因素进行了分析。实验研究结果表明:临界压比只与喷头的结构有关,与气液压力无关。临界压比随着面积比的增加而增加。出口直径越小,临界压比越大。通气方式对临界压比的影响比并不大。增加旋流芯,喷头临界压比增加。混合室收敛角对喷头临界压比的影响很小。实验研究确定了不同结构气泡雾化喷头的临界工况时临界压比的变化规律,为气泡雾化喷头的设计及安全可靠运行提供了依据。

In this study, an effervescent nozzle is designed. Using the nozzle atomization characteristic comprehensive experiment platform, the critical pressure of the nozzle mixing chamber is studied. The effects of different structures on the critical pressure are investigated and the affecting factors are analyzed. The results show that： the critical pressure ratio is only related to the structure of the nozzle ; the critical pressure ratio increases with the increase of area ratio; the smaller outlet diameter, the greater the critical pressure ratio; the influence of ventilation mode on critical pressure ratio is very low; after adding a vortex core, the critical pressure ratio increases; the convergence angle has little effect on the critical pressure ratio. Through the experimental investigation, the variation rule of the critical pressure ratio under the critical condition of different structure effervescent nozzle is determined, which provides the basis for the design and safe and reliable operation of the effervescent atomizer.