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首页> 外文期刊>Combustion and Flame >Acoustic parametric instability, its suppression and a beating instability in a mesoscale combustion tube
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Acoustic parametric instability, its suppression and a beating instability in a mesoscale combustion tube

机译：声学参数稳定性，其抑制和Messcle燃烧管中的搏动不稳定

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摘要

The present work reports thermo-acoustic instability in a mesoscale tube of diameter 8 mm ( quenching diameter) and length 702 mm. Mixtures with Lewis number, Le similar to 0.8 (rich C2H4/O-2/CO2), 1.05 (lean C2H4/O-2/CO2) and 1.34 (lean C2H4/O-2/N-2) are used. Several new flame responses are observed. For lower burning velocity mixtures, flame extinction is observed due to heat loss when primary instability transforms to secondary instability for all Le mixtures. However, parametric cellular structures which are characteristic of parametric instability are observed only for Le of 0.8. It is proposed based on calculations and experiments that parametric structures will be observed only when diameter of tube is two times larger than the characteristic wavelength of parametric instability. If the tube diameter doesn?t allow formation of parametric structure whirling and counter-rotating flames are observed instead of parametric structures. Suppression of acoustic parametric instability is observed for higher burning velocity mixtures with Le 1 and its mechanism is discussed. For a range of SL, a beating instability is observed for CO2 diluted mixtures of Le 1, where pressure oscillation and flame motion show beating oscillations of frequency around 15 Hz. This beating instability is believed to be caused by non-linear interaction of acoustic instability with pulsating instability of flame front which is caused due to combined radiative and convective heat loss. Due to CO2 dilution, the radiative heat losses could play a significant role in inducing pulsating instability. (C) 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：本工作报告了直径为8mm（淬火直径）和长702mm长度的Messcale管中的热声不稳定性。使用Lewis Number的混合物，LE类似于0.8（富含C 2 H 4 / O-2 / CO 2），1.05（贫C2H4 / O-2 / CO2）和1.34（贫C2H4 / O-2 / N-2）。观察到几个新的火焰响应。对于较低的燃烧速度混合物，由于初次不稳定性转换为所有LE混合物的次级不稳定性，由于热量损失，观察到火焰消失。然而，仅针对0.8的Le观察到参数不稳定性的参数蜂窝结构。基于计算和实验，仅当管的直径是比参数不稳定的特征波长大的两倍时，才会观察到参数结构的实验。如果管道直径不会允许形成参数结构旋转，并且观察到反向旋转的火焰而不是参数结构。对于具有Le＆GT的更高燃烧的速度混合物，观察到声学参数稳定性的抑制。讨论了其机制。对于一系列SL，观察到LE＆GT的CO2稀释混合物的搅拌不稳定性;如图1所示，压力振荡和火焰运动显示频率频率约为15 Hz。这种跳动不稳定性被据信由声不稳定性的非线性相互作用引起火焰前部的脉冲不稳定性，这是由于组合辐射和对流热损失引起的。由于CO2稀释，辐射热损失可能在诱导脉动不稳定性方面发挥重要作用。 （c）2021燃烧研究所。由elsevier Inc.保留所有权利发布。

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  • 来源
    《Combustion and Flame》 |2021年第6期|277-291|共15页
  • 作者

    Dubey Ajit Kumar; Koyama Yoichiro; Hashimoto Nozomu; Fujita Osamu;

  • 作者单位

    Hokkaido Univ Div Mech & Space Engn Kita Ku Kita 13 Nishi 8 Sapporo Hokkaido 0608628 Japan|Tohoku Univ Inst Fluid Sci Aoba Ku 2-1-1 Katahira Sendai Miyagi 9808577 Japan|Tohoku Univ Res Alliance Ctr Math Sci Aoba Ku 6-3 Aoba Sendai Miyagi 9808578 Japan;

    Hokkaido Univ Div Mech & Space Engn Kita Ku Kita 13 Nishi 8 Sapporo Hokkaido 0608628 Japan;

    Hokkaido Univ Div Mech & Space Engn Kita Ku Kita 13 Nishi 8 Sapporo Hokkaido 0608628 Japan;

    Hokkaido Univ Div Mech & Space Engn Kita Ku Kita 13 Nishi 8 Sapporo Hokkaido 0608628 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mesoscale combustion; Pulsating instability; Combustion tube; Beating instability; Parametric instability;

    机译：Mesoscale燃烧;脉动不稳定;燃烧管;击败不稳定;参数不稳定;

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