The supersonic nozzle is very often used in many technical applications, such as fluid-flow machines or devices. If the medium flowing through a supersonic nozzle is a moist gas, moist air or wet steam, non-equilibrium condensation must occur. Such mediums usually contain impurities which affect the condensation phenomenon. The main purpose of this research is a numerical study on the effect of the content of impurities in steam on the non-equilibrium condensation phenomenon. In order to achieve this purpose, salt (NaCl) is used. Sodium chloride (NaCl) is a very common steam impurity. It may occur in a soluble or crystal form. Different concentrations of salt are considered as the input quantity. The results show that the process of steam condensation on salt particles has a significant impact on two-phase variables and flow parameters. In the presence of salt, steam condensation starts whenever the supersaturation ratio is above one. Latent heat of the condensation changes the flow pattern and reduces the nucleation rate and water droplet production. The presence of ${10}^{15}$ particles of salt reduces the outlet average liquid mass fraction and entropy generation by 14.5 % and 15.2 % respectively. The research results prove that steam impurities have a significant impact on non-equilibrium condensation.

超音速喷嘴经常用于许多技术应用，例如流体流动机器或设备。如果流经超音速喷嘴的介质是湿气体、湿空气或湿蒸汽，则必然发生非平衡冷凝。此类介质通常含有影响冷凝现象的杂质。本研究的主要目的是数值研究蒸汽中杂质含量对非平衡冷凝现象的影响。为了达到这个目的，使用了盐（NaCl）。氯化钠 (NaCl) 是一种非常常见的蒸汽杂质。它可能以可溶或晶体形式存在。不同浓度的盐被视为输入量。结果表明，蒸汽在盐粒上凝结的过程对两相变量和流动参数有显着影响。在有盐的情况下，只要过饱和比高于 1，就会开始蒸汽冷凝。冷凝潜热会改变流动模式并降低成核率和水滴产生。的存在${10}^{15}$盐颗粒使出口平均液体质量分数和熵产生分别降低 14.5% 和 15.2%。研究结果证明蒸汽杂质对非平衡冷凝有显着影响。