摘要
本文通过实验对气泡雾化喷嘴雾化特性进行了研究。采用高速摄像机记录了注气管的鼓泡过程,以及气泡的聚合和破碎导致混合室中流型的转变现象.实验中观察到混合室中存在三种典型流型,即泡状流、过渡流和环状流.采用激光粒度仪对喷雾液滴的粒径进行了测量,获得了典型流型下的液滴粒径分布曲线。泡状流和环状流的液滴粒径呈单峰分布,过渡流的液滴粒径呈双峰分布。研究了气液比(GLR)、液体质量流量、喷孔孔径等参数对液滴粒径的影响规律,结果表明GLR越大,液体质量流量越大,孔径越小,液滴SMD越小.分析了雾化过程的不稳定性,GLR越大,孔径越小,稳定性越差.
In this paper, the characteristics of effervescent atomization are studied experimentally.A high speed camera was used to record the bubbling process and the change of the flow regime in the mixing chamber. Three typical flow regimes were observed, namely, bubble flow, transition flow and annular flow. The particle size of the spray droplet was measured by a laser particle sizer.The droplet diameter distribution curve under typical flow regimes was obtained. Bubble flow and annular flow showed a single peak distribution, while transition flow showed a bimodal distribution.The effects of parameters such as gas-liquid ratio(GLR), liquid mass flow rate and orifice diameter on droplet size were studied. The results showed that the larger the GLR, the larger the liquid mass flow rate and the smaller the orifice diameter, the smaller the SMD. The instability of the atomization process is analyzed. The larger the GLR and the smaller the orifice diameter, the greater the instability.
作者
王文杰
郑学波
白博峰
WANG Wen-Jie;ZHENG Xue-Bo;BAI Bo-Feng(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第4期834-838,共5页
Journal of Engineering Thermophysics
基金
国家杰出青年科学基金(No.51425603)
国家自然科学基金委重大科研仪器研制项目(No.51527808)
关键词
气泡雾化
雾化特性
气液比
雾化不稳定性
effervescent atomization
atomization characteristics
gas-liquid ratio
atomization instability
