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中文摘要：
本文实验研究了蒸汽以射流形态喷射入管内流动水中,发生蒸汽-水直接接触凝结所诱导的压力波动特性。实验是在蒸汽质量流速0~500 kg.m~（-2）·s~（-1）以及管内流动水温度20~70℃的条件下进行的。通过管道壁面安装的高频压力传感器捕获凝结诱导的压力波动信号,并通过小波多分辨率工具揭示压力波在时频平面的特性规律。小波多分辨率分析及能量分析结果表明尺度4,5（对应频率f=125~250 Hz）代表了凝结压力波的主要特征信息,而其他频带的信息几乎为0。小波多分辨率幅值结果分析表明在较高频带和较低频带压力波的小波多分辨率幅值趋近于0。在尺度4,5上（对应频率.f=125~250 Hz）,随着蒸汽质量流量的增大,小波多分辨率幅值先增大后减小;随着水温的升高小波多分辨率幅值逐渐增大。
英文摘要：
The pressure wave induced by steam jet condensation in water flow in a vertical pipe was investigated experimentally. The inlet steam flow rate and the subcooled water temperature were in the range of 0-500 kg.m-2-s-1 and 20-70℃, respectively. The pressure wave caused by the steam jet condensation was captured by several pressure transducers with high frequency, which are mounted on the wall of the vertical pipe. In order to reveal the unsteady features of the pressure wave over a frequency-time plane, the wavelet multi-resolution analysis was first applied to analyze the wall pressure-time signal of experimental data. It was found that the energy of wavelet multi-resolution peaks are observed at levels 4 and 5, which corresponds to scale f=125-250 Hz approximately, while the energy information at the other scale are ahnost equals to zero. The amplitudes of wavelet multi-resolution are almost zero at relative higher and lower frequency levels. In the levels of 4 and 5 （corresponding to scale f=125-250 Hz approximately）, the amplitudes first increase and then decrease with increase of steam mass flux, and the amplitudes increase with water temperature.
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