In this study, the hydrodynamics of the negatively buoyant supersonic steam jet injected into the water has been investigated based on the effects imparted by its density difference with the water in free and confined configurations. In case of both the upward and downward steam’s free injection, the steam jet-water flow has shown a clear deviation from the non-dimensionalized Boussinesq character. However, in the confined injection, the steam jet creates recirculation regions contributing to enhancing mixing with the water. The generation of recirculation regions owes to the existence of the low-pressure regions at the nozzle exit, baroclinic torque and buoyantly influenced flows, which is associated with the density difference between the steam and water and the shear between the two phases. The buoyancy affects the flow domains in a nonuniform manner. It affects the fluctuating quantities marginally in the jet-developing region, and in the middle section, however, its effect is dominant in the steam jet’s tip region.

在这项研究中，已经研究了注入到水中的负浮超音速蒸汽射流的流体动力学，其基于自由和受限构型下与水的密度差所产生的影响。在向上和向下自由喷射蒸汽的情况下，蒸汽喷射的水流显示出与无量纲的Boussinesq特征的明显偏差。但是，在受限注入中，蒸汽射流会形成再循环区域，从而有助于增强与水的混合。再循环区域的产生是由于喷嘴出口处存在低压区域，斜压扭矩和流动性受到影响的浮力，这与蒸汽和水之间的密度差以及两相之间的剪切力有关。浮力以非均匀的方式影响流域。它在喷流发生区域和中部区域对波动量的影响很小，但是，在蒸汽喷流的尖端区域，其影响占主导地位。