Influence of Turbulent gaseous jet configuration on entrainment – A Comparative Schlieren study

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-05-13 DOI:10.1016/j.expthermflusci.2025.111523

Ben Binyamin Ben David Holtzer, Leonid Tartakovsky

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引用次数: 0

Abstract

The reported study is motivated by the recently published data on significant Particulate Matter (PM) formation in hydrogen-fed Internal Combustion Engines. These works showed that PM formation is dominated by the entrained lubricant involvement in the combustion which is governed by the hydrogen jet. However, there is a lack of the knowledge about the hollow-cone jet entrainment characteristics at different stages of the jet development and a comparison of the entrainment characteristics with the round jet. Schlieren optical imaging accompanied by the smoke-wire visualization of the ambient entrainment into the jet is suggested for the first time to study the entrainment characteristics of the hollow-cone jet. The following novel findings are attained in the reported study. We show that the hollow-cone jets exhibit different vapor front entrainment behavior, compared to the round jet. Moreover, the study found that the distance between the jet Turbulent Non-Turbulent Interface to the vapor layer is a major factor affecting the entrainment in the free jet region. Additionally, the geometry influence was found to be more important than the injection system properties like injection-pressure and mass flow rate.

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湍流气体射流结构对夹带的影响——纹影对比研究

据报道，这项研究的动机是最近发表的关于氢燃料内燃机中显著颗粒物（PM）形成的数据。这些工作表明，PM的形成主要是由夹带的润滑剂参与燃烧，这是由氢射流控制的。然而，对于空心锥射流在不同发展阶段的带射特性以及与圆形射流带射特性的比较研究还比较缺乏。首次提出了采用纹影光学成像结合烟丝可视化的方法来研究空心锥射流的夹带特性。在报告的研究中获得了以下新发现。结果表明，与圆形射流相比，空心锥射流表现出不同的蒸汽前缘夹带行为。此外，研究发现，射流湍流非湍流界面与蒸汽层之间的距离是影响自由射流区域夹带的主要因素。此外，几何形状的影响比喷射系统性能（如喷射压力和质量流量）更重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.