中文摘要：

本文对变质量流率蒸汽浸没射流压力振荡特性开展了实验研究，发现蒸汽质量流率随时间延长呈指数规律下降。蒸汽射流凝结经历了稳定凝结、振荡凝结、过渡喘振和喘振四个阶段，射流初始水温越高，各个凝结区域转换点对应的蒸汽质量流率越高。在不同的凝结区域，蒸汽质量流率和过冷水温度对振荡特性的影响程度不同。相同蒸汽质量流率时，初始水温越高振荡频率越小。振荡强度均方根值和峰值均在凝结振荡区达到最大，且初始水温越高，最大值对应的蒸汽质量流率越高，振荡强度峰值最高可达70kPa。

英文摘要：

In this study, the characteristic of pressure oscillation for submerged steam jet with variable mass flux was investigated experimentally. It was found that the steam mass flux nearly decreased with time increasing following exponential law. Steam condensation experienced four stages： stable condensation, condensation oscillation, transition chugging and chugging. The higher the initial water temperature was, the larger the steam mass flux that transformation position corresponded was. In different condensation regimes, the impact of steam mass flux and water temperature was different. With the same steam mass flux, oscillation frequency decreased when initial water temperature increased. The RMS and peak value of oscillation intension reached the maximum in condensation oscillation regime. And the higher maximum value corresponded was kPa. initial water temperature was, The maximum value of peak the higher the steam mass ftux that oscillation intension could reach 70