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Numerical investigation of the effect of the injection angle on the spray structures of an air-blast atomizer

机译：注射角对冲洗雾化器喷雾结构的数值研究

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PurposeThe purpose of this study is to investigate the effect of the injection angle alpha on the spray structures of an air-blast atomizer and help enhance the understanding of droplet-gas mixing process in such atomizers in the engineering domain.Design/methodology/approachThe phenomena in the air-blast atomizer were numerically modelled using the computational fluid dynamics software Fluent 17.2. The Euler-Lagrange approach was applied to model the droplet tracking and droplet-gas interaction in studied cases. The standard k-epsilon model was used to simulate the turbulent flow. A model with a modified drag coefficient was used to consider the effects of the bending of the liquid column and its penetration in the primary breakup region. The Kelvin-Helmholtz, Rayleigh-Taylor model was applied to consider the secondary breakup of the droplets.FindingsThe basic spatial distribution and spray structures of the droplets corresponding to the angled liquid jet (alpha = 60 degrees) were similar to those reported in liquid jets injected transversely into a gaseous crossflow studies. The injection angle alpha did not considerably influence the averaged Sauter to mean diameter (SMD) of the cross-sections. However, the spray structures pertaining to alpha = 30 degrees, alpha = 60 degrees and alpha = 90 degrees were considerably different. In the case of the atomizer with multiple injections, a "collision region" was observed at alpha = 60 degrees and characterized by a higher ci and larger averaged SMD in the central parts of the cross-sections.Originality/valueThe injection angle alpha is a key design parameter for air-blast atomizers. The findings of this study can help enhance the understanding of the droplet-gas mixing process in air-blast atomizers. Engineers who design air-blast atomizers and face new challenges in the process can refer to the presented findings to obtain the desired atomization performance. The code has been validated and can be used in the engineering design process of the gas-liquid jet atomizer.
机译：本研究的目的目的是探讨注射角α对鼓风机雾化器的喷雾结构的影响，并有助于提高工程域中的雾化器中的液滴 - 气体混合过程的理解.Design/Methodology/ApproChe在风爆雾化器中，使用计算流体动力学软件流畅的17.2进行了数值模拟。应用了欧拉拉格朗朗方法以模拟研究中的液滴跟踪和液滴 - 气体相互作用。标准K-EPSILON模型用于模拟湍流。使用改进的阻力系数的模型用于考虑液柱弯曲的效果及其在初级分解区域中的渗透。应用Kelvin-Helmholtz，Rayleigh-Taylor模型应用于考虑液滴的二次分解。Findingsthe对应于成角度的液体射流（α= 60度）的液滴的基本空间分布和喷雾结构类似于液体喷射中报告的液滴横向注射到气态横流研究中。注射角α没有显着影响平均燃露者对横截面的平均直径（SMD）。然而，与α= 30度有关的喷雾结构α= 60度和α= 90度相当不同。在具有多次喷射的雾化器的情况下，在α= 60度下观察“碰撞区域”，并在横截面的中心部分中的较高CI和更大的平均SMD。风吹雾化器的关键设计参数。该研究的结果可以帮助提高风力雾化器中液滴气混合过程的理解。设计风吹雾化器和面临新挑战的工程师可以参考所提出的调查结果，以获得所需的雾化性能。代码已被验证，可用于气液喷射雾化器的工程设计过程中。

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