起伏条件下不稳定射流压力振荡特性实验研究

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

蒸汽在过冷水中浸没射流凝结技术因其高效换热特性被广泛应用于陆地和海洋场景下的电力和核工业等许多工业领域中,但蒸汽凝结过程中汽液相界面变化会产生压力振荡。本文对起伏条件下不稳定射流的压力振荡特性进行了实验研究,获得了不同起伏参数对压力振荡特性的影响。结果表明,相比于静止条件下,不稳定射流在起伏运动下的压力振荡主频与压力振荡平均幅值更大,并且压力振荡主频和压力振荡平均幅值随着起伏幅值的增大而增大,随着起伏周期的增大而减小;起伏最大加速度幅度随着起伏周期的减小和起伏幅值的增大而增大,斯特劳哈尔数随着起伏最大附加加速度的增大而增大。

The steam-submerged jet condensation technology is widely used in many industrial fields,such as power and nuclear industries,in both land and ocean scenarios,due to its highly efficient heat transfer characteristics.However,changes in the vapor-liquid phase interface during steam condensation can generate pressure oscillation.This paper experimentally studied the pressure oscillation characteristics of unstable jets under heave conditions,and obtained the effects of different heave parameters on pressure oscillation characteristics.The results show that under heave motion,the unstable jet has a higher dominant frequency and average amplitude of pressure oscillation compared to motionless conditions,and dominant frequency and average amplitude of pressure oscillation increase with the increase of heave amplitude,but decrease with the increase of heave period.The maximum acceleration amplitude of heave also increases with the decrease of heave period and the increase of heave amplitude,and the Strouhal number increases with the increase of maximum additional acceleration of heave.