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设计并搭建了横掠气流下波形板壁液膜破裂可视化研究的实验台架,研究不同液膜厚度下气流速度与液膜破膜速度之间的关系。通过改变液膜流量和气流速度获得不同液膜厚度条件下的临界破膜速度,并利用高速摄像技术对液膜破裂行为进行研究。结果表明,液膜的破裂与气流速度、液膜厚度有关,两者呈负相关性;无量纲分析表明液膜的惯性力和气流剪切力是导致其破裂的不稳定性因素,而壁面粘性力和液膜表面张力则是抑制液膜破裂的稳定性因素;液膜在临界气流剪切力作用下发生破裂的破口是从波形板的屈折角(凸角)开始的,而且液膜可以以不同的形式被卷入到气流中,液膜破裂形态与液膜厚度有关。
The experimental bench for the visualization of corrugated liquid-wall rupture under the swept airflow was designed and constructed to study the relationship between the airflow velocity and the rupture velocity of the liquid film at different liquid film thickness. The critical rupture velocity under different film thickness was obtained by changing the liquid film flow rate and gas flow rate. The rupture behavior of liquid film was studied by using high-speed camera technology. The results show that the rupture of the liquid film is related to the gas velocity and the thickness of the liquid film, and the two are negatively correlated. The non-dimensional analysis shows that the inertial force and the airflow shear force of the liquid film are the instability factors leading to the rupture. Force and liquid film surface tension are the stability factors that inhibit liquid film rupture. The rupture of the liquid film ruptured by the critical airflow shear force starts from the flexion angle (lobe) of the corrugated plate, and the liquid film can In different forms are involved in the air flow, liquid film rupture and liquid film thickness.