横荡条件下不稳定射流压力振荡主频实验研究

Experimental Study on the Dominant Frequency of Pressure Oscillations in Unstable Jets under Sway Conditions

蒸汽浸没射流具有高效的传热传质特性,在核反应堆等相关系统中有重要应用,但其凝结过程会产生压力振荡,危及相关设备的安全稳定运行。本研究对横荡条件下不稳定射流的压力振荡主频进行了实验研究,获得了不同横荡参数对压力振荡主频的影响规律。研究结果表明,横荡条件下不稳定射流的压力振荡主频高于静止条件下,在横荡周期为2 s,横荡幅值为70 mm时,压力振荡主频最大增幅达到102.7%,并且压力振荡主频随着横荡周期和过冷水温度的增加而减小,随着横荡幅值的增加而增加。

The steam submerged jet has efficient heat and mass transfer characteristics,and has important applications in nuclear reactors and other related systems,but its condensation process will produce pressure oscillations,which endanger the safe and stable operation of related equipment.In this study,the pressure oscillation dominant frequency of unstable jet under sway conditions was experimentally studied,and the influence of different sway parameters on the dominant frequency of pressure oscillation was obtained.The research results show that the pressure oscillation dominant frequency of unstable jet under sway conditions is higher than that under motionless conditions.When the sway period is 2 s and the sway amplitude is 70 mm,the maximum increase of the pressure oscillation dominant frequency reaches 102.7%,and the dominant frequency of pressure oscillation decreases with the increase of the sway period and subcooled water temperature,and increases with the increase of the sway amplitude.