蒸汽射流压力振荡主频研究

摘要

The pressure oscillation characteristics due to steam jet condensation in water were experimentally investigated in stable jet region. The main frequency of pressure oscillation was obtained by the FFT method,and the effects of steam mass flux and water temperature on main frequencies were analyzed. Main frequencies decreased with increasing steam mass flux and water temperature,as the result of steam condensation and heat transfer. Moreover,a previous correlation was used to predict the main frequency by considering the dimensionless steam mass flux and condensation driving potential,and for the present experimental parameters good agreement was obtained between predictions and experiments with discrepancies within ±8%.%在稳定射流区，对饱和蒸汽在过冷水中浸没射流凝结引起的压力振荡特性进行了研究，测量得到了不同汽水参数下的压力振荡特性。通过FFT方法得到了压力振荡的主频，并分析了蒸汽质量流率和水温对压力振荡主频的影响规律，蒸汽射流凝结换热特性决定了压力振荡主频随着蒸汽质量流率和水温的增大而降低。同时，利用先前学者提出的公式并引入量纲为1的蒸汽质量流率和凝结势给出了计算主频的实验关联式，结果表明在本实验参数范围内计算值与实验值具有相同的变化趋势，且吻合的较好，误差在±8%以内。