微重力条件下乙烯球形扩散火焰的多维效应

IF 3 3区 农林科学 Q2 ECOLOGY Fire-Switzerland Pub Date : 2023-07-27 DOI:10.3390/fire6080285
S. Frolov, V. Ivanov, F. Frolov, I. Semenov
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引用次数: 0

摘要

美俄联合空间实验火焰设计(Adamant)于2019年至2022年在国际空间站(ISS)上实施。实验目的是研究微重力条件下多孔燃烧器(PB)周围球形扩散火焰(SDF)的辐射消光及其烟尘形成的控制机制。本研究的对象是气态乙烯在氮气稀释的氧气气氛中,在室温和压力范围从0.5到2atm的正常和逆sdf。本文给出了有和无辐射消光的24个正sdf和13个逆sdf的瞬态一维和二维计算结果。一维计算揭示了不同化学计量混合分数值下sdf演化的一些共性。对于正向和逆sdf,火焰半径与流体质量流过PB的比率与化学计量混合物分数之间存在明确的依赖关系。这些依赖关系使得对正常和逆sdf的火焰生长速率、火焰寿命和熄灭时火焰半径的比较得出重要结论。进行二维计算是为了更好地理解所观察到的各种非一维效应,如火焰相对于PB中心的不对称、气体供应管附近的火焰淬火、火焰亮度的不对称等。流体通过PB的局部质量流率是不均匀的,在附加供液管的PB半球达到最大流量,这可能是空间实验中观察到的火焰不对称的原因。在零重力下,二维乙烯sdf的演化是振荡的,火焰形状和温度的缓慢变化是由周围气体中环形涡的开始引起的。定向微重力的引入,在0.01g的水平上,导致火焰振荡完全被抑制。
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Spherical Diffusion Flames of Ethylene in Microgravity: Multidimensional Effects
The joint American–Russian Space Experiment Flame Design (Adamant) was implemented on the International Space Station (ISS) in the period from 2019 to 2022. The objectives of the experiment were to study the radiative extinction of spherical diffusion flames (SDF) around a porous burner (PB) under microgravity conditions, as well as the mechanisms of control of soot formation in the SDF. The objects of the study were the normal and inverse SDFs of gaseous ethylene in an oxygen atmosphere with nitrogen dilution at room temperature and pressures ranging from 0.5 to 2 atm. The paper presents the results of transient 1D and 2D calculations of 24 normal and 13 inverse SDFs with and without radiative extinction. The 1D calculations revealed some generalities in the evolution of SDFs with different values of the stoichiometric mixture fraction. The unambiguous dependences of the ratio of flame radius to fluid mass flow rate through the PB on the stoichiometric mixture fraction were shown to exist for normal and inverse SDFs. These dependences allowed important conclusions to be made on the comparative flame growth rates, flame lifetime, and flame radius at extinction for normal and inverse SDFs. The 2D calculations were performed for a better understanding of the various observed non-1D effects like flame asymmetry with respect to the center of the PB, flame quenching near the gas supply tube, asymmetrical flame luminosity, etc. The local mass flow rate of fluid through the PB was shown to be nonuniform with the maximum flow rate attained in the PB hemisphere with the attached fluid supply tube, which could be a reason for the flame asymmetry observed in the space experiment. The evolution of 2D ethylene SDFs at zero gravity was shown to be oscillatory with slow alterations in flame shape and temperature caused by the incepience of torroidal vortices in the surrounding gas. Introduction of the directional microgravity, on the level of 0.01g , led to the complete suppression of flame oscillations.
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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