Influence of Hydrodynamics on Soot Process in Laminar Jet Diffusion Flame

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE

Microgravity Science and Technology Pub Date : 2025-07-25 DOI:10.1007/s12217-025-10196-2

Kun Liu, Feng Zhu, Shuangfeng Wang, Xiuzhen Wang, Jieyu Jiang

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Abstract

The mechanism controlling the soot process of a laminar jet diffusion flame is investigated through experiments and theoretical analyses. The effect of hydrodynamic characteristics on the soot volume fraction and smoke point of jet flames is focused on. The luminous flame height at smoke point under normal gravity and microgravity environment were compared. The soot concentration and temperature distributions of laminar ethylene diffusion flames with different co-flow air velocities and fuel nozzle diameters are measured by light extinction method and RGB two-color pyrometry method, respectively. High co-flow air velocity and small nozzle diameter can reduce the soot content in the flame, resulting in a higher smoke point, which is related to the increase in flame temperature caused by a shorter residence time and better fuel–air mixing conditions. The simple prediction of the theoretical oxidation zone shows that decreasing the nozzle diameter may make the oxidation zone longer, favouring the oxidation of soot in the flame tip region. Furthermore, a brief theoretical analysis of the contributions of fuel exit momentum and buoyancy in residence time during fuel combustion is presented. It is considered that when the fuel outlet diameter is small, the nozzle diameter may affect the residence time and hence the smoke point to a greater extent. This work provides new insights into the influence of hydrodynamics on soot process in laminar jet diffusion flame.

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流体力学对层流射流扩散火焰中烟尘过程的影响

通过实验和理论分析，探讨了控制层流射流扩散火焰烟尘过程的机理。重点研究了流体动力特性对射流火焰烟尘体积分数和烟点的影响。比较了正常重力和微重力环境下烟点发光火焰高度。采用消光法和RGB双色热法分别测量了不同共流风速和喷嘴直径下层流乙烯扩散火焰的烟尘浓度和温度分布。高的共流气流速度和小的喷嘴直径可以降低火焰中的烟尘含量，从而导致较高的烟点，这与较短的停留时间和较好的燃料-空气混合条件引起的火焰温度升高有关。对理论氧化区进行了简单的预测，结果表明减小喷嘴直径可以使氧化区变长，有利于烟灰在火焰尖端区域的氧化。此外，对燃料燃烧过程中燃料出口动量和浮力对停留时间的贡献进行了简要的理论分析。认为当燃油出口直径较小时，喷嘴直径对停留时间的影响更大，从而对烟点的影响更大。本研究为流体力学对层流射流扩散火焰中烟尘过程的影响提供了新的认识。

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来源期刊

Microgravity Science and Technology 工程技术-工程：宇航

CiteScore

3.50

自引率

44.40%

发文量

期刊介绍： Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology