粘性应力对液体扩张抛撒影响的实验研究

利用组合式激波管和高速摄影机,获得不同工况的气液界面不稳定性发展直至发生首次破碎的高速摄影照片.实验结果表明,RT不稳定性和RM不稳定性均随时间增长.在扰动波发展的过程中,两相混合区中气泡的前缘基本保持圆形,而尖钉的头部在发展过程中有雾化的迹象.由于黏性的存在,不稳定性的发展将受到抑制,且随着黏性系数的增大,扰动波的增长系数随之减小.

A Study On The Effect Of Viscous Stress On Expanding Dissemination Of Liquid

With the combined shock tube and high-speed camera, high-speed photographs of the instability on the interface of gas/liquid and primary breakup in different experimental conditions were obtained. It was shown that the RT instability and RM instability were both increased with the time. During the increasement of disturbance waves, the front of bubbles kept circle and atomization taken place at the front of spikes. The development of instability was restrained for the existence of viscous stress. And the growth factor was decreased with the increasement of viscous coefficient.