Abstract The pressure oscillation is an important characteristic of direct contact condensation of steam in subcooled water. Many experimental works have been performed on pure steam submerged jet condensation. However, the effect of non-condensable gas content on the characteristics of the pressure oscillation is not yet fully understood. So, present paper aims to investigate the effect of air mass fraction on the characteristics of the pressure oscillation. Experimental results show that: for pure steam jets, the pressure oscillation dominant frequency decreases with the rise of water temperature and nozzle diameter. While it increases with the rise of steam mass velocity, which is consistent with the most of previous research results. The pressure oscillation intensity increases with the rise of water temperature, steam mass velocity and nozzle diameter. For air-steam mixture gas jets, the effect of water temperature and steam mass velocity on pressure oscillation characteristics is the same as pure steam jets. The pressure oscillation dominant frequency rapidly decreases with the rise of air mass fraction. However, air mass fraction has a complex effect on pressure oscillation intensity. As the air mass fraction increases, the pressure oscillation intensity rapidly increases at first, then slowly decreases and then slowly increases. In addition, new correlations for pressure oscillation dominant frequency and intensity are developed. The predicted results agree well with the experimental results.

中文翻译：

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不凝气体对凝结振荡区水下蒸汽喷射凝结压力振荡的影响

摘要 压力振荡是蒸汽在过冷水中直接接触冷凝的重要特征。已经对纯蒸汽浸没射流冷凝进行了许多实验工作。然而，不凝气体含量对压力振荡特性的影响尚未完全了解。因此，本文旨在研究空气质量分数对压力振荡特性的影响。实验结果表明：对于纯蒸汽射流，压力振荡主频随着水温和喷嘴直径的增加而减小。而随着蒸汽质量速度的增加而增加，这与以往的大部分研究结果是一致的。压力振荡强度随着水温的升高而增加，蒸汽质量速度和喷嘴直径。对于空气-蒸汽混合气体射流，水温和蒸汽质量速度对压力振荡特性的影响与纯蒸汽射流相同。压力振荡主频率随着空气质量分数的增加而迅速降低。然而，空气质量分数对压力振荡强度有复杂的影响。随着空气质量分数的增加，压力振荡强度先快速增加，然后缓慢降低，然后缓慢增加。此外，还开发了压力振荡主频率和强度的新相关性。预测结果与实验结果吻合良好。水温和蒸汽质量速度对压力振荡特性的影响与纯蒸汽射流相同。压力振荡主频率随着空气质量分数的增加而迅速降低。然而，空气质量分数对压力振荡强度有复杂的影响。随着空气质量分数的增加，压力振荡强度先快速增加，然后缓慢降低，然后缓慢增加。此外，还开发了压力振荡主频率和强度的新相关性。预测结果与实验结果吻合良好。水温和蒸汽质量速度对压力振荡特性的影响与纯蒸汽射流相同。压力振荡主频率随着空气质量分数的增加而迅速降低。然而，空气质量分数对压力振荡强度有复杂的影响。随着空气质量分数的增加，压力振荡强度先快速增加，然后缓慢降低，然后缓慢增加。此外，还开发了压力振荡主频率和强度的新相关性。预测结果与实验结果吻合良好。压力振荡强度先快速增加，然后缓慢降低，然后缓慢增加。此外，还开发了压力振荡主频率和强度的新相关性。预测结果与实验结果吻合良好。压力振荡强度先快速增加，然后缓慢降低，然后缓慢增加。此外，还开发了压力振荡主频率和强度的新相关性。预测结果与实验结果吻合良好。