含不凝性气体蒸汽浸没射流冷凝压力振荡实验研究

实验研究了不凝性气体（空气）含量、水温和蒸汽质量流速对蒸汽浸没射流冷凝压力振荡特性的影响，实验工况横跨冷凝振荡（CO）区和稳定冷凝（SC）区。结果表明：对于纯蒸汽射流，压力振荡主频随水温的升高而降低，振荡强度随水温的升高而升高；在CO区，振荡主频和振荡强度均随蒸汽质量流速的升高而升高；在SC区，振荡主频随蒸汽质量流速的升高而降低，振荡强度基本上不随蒸汽质量流速的变化而发生改变；对于含空气射流，随空气质量分数的增加，振荡主频总体呈下降趋势，振荡强度先迅速下降后小幅上升，在空气质量分数为0.05～0.1区域内振荡主频和振荡强度均存在极小值。

Experimental Investigation on Pressure Oscillation of Submerged Steam Jet Condensation with Non-condensable Gas

Experimental investigation on the effect of non-condensable gas content, temperature and steam mass velocity on submerged steam jet condensation pressure oscillation was performed. Experimental conditions across condensation oscillation (CO) region and stable condensation (SC) region. Experimental results show that for pure steam jets, the pressure oscillation dominant frequency decreases with the rise of water temperature, while the pressure oscillation intensity increases with the rise of water temperature. Both pressure oscillation dominant frequency and intensity increase with steam mass velocity in CO region. However, the pressure oscillation dominant frequency decreases with the rise of steam mass velocity, and the pressure oscillation intensity hardly changes with the rise of steam mass velocity in SC region. For air-steam mixture gas jets, the pressure oscillation dominant frequency decreases with the rise of air mass fraction. However as the air mass fraction increases, the pressure oscillation intensity rapidly decreases at first, then slowly increases. Both pressure oscillation dominant frequency and intensity reach a minimum when the air mass fraction is between 0.05 and 0.1.