This paper addresses the analysis and characteristics of submerged underexpanded air jets injected into water by means of single and twin tuyeres (i.e. straight tubes). First, a Computational Fluid Dynamics simulation of a single tuyere is compared with available experimental data found in the literature. In the twin tuyere configuration, spacing is varied and the resultant flow is compared to that obtained with the single tuyere configuration. When two tuyeres are closely placed, compared to a single tuyere injecting the same mass flow, an increase in the potential core of each jet and a combined core are found, along with an increase in mixing levels. With larger tuyere spacing, individual cores, shorter potential core length and a significant increase in mixing levels are found. In addition, a general selection guideline is presented to help the design of a process involving gas being injected into a liquid.

本文讨论了通过单和双风口（即直管）注入水中的淹没欠膨胀空气射流的分析和特性。首先，将单个风口的计算流体动力学模拟与文献中的可用实验数据进行比较。在双风口配置中，间距是变化的，并且将所得流量与单风口配置获得的流量进行比较。当两个风口靠近放置时，与注入相同质量流量的单个风口相比，发现每个射流和组合核心的潜在核心增加，同时混合水平增加。发现风口间距越大，单个核心，潜在核心长度越短，混合水平显着增加。此外，