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Experimental Study of Laminar Burning Speed for Premixed Biomass/Air Flame

机译：预混生物质/空气火焰层流燃烧速度的实验研究

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摘要

Biomass has been considered as a valuable alternative fuel recently. A fundamental property of biomass/air flame, laminar burning speed, is measured in this research. Experiments have been made in a cylindrical combustion vessel with two end windows. Central ignition has been used to start the combustion process. A high-speed CMOS camera capable of taking pictures of 40,000 frames per second has been used to study morphology of flame front. Flames are initially smooth, and as pressure and flame radius increase, cracks and cells appear on the flame surface. In this paper, experimental results have only been reported for smooth flames. A multishell thermodynamic model to measure laminar burning speed of biomass/air mixture with varying CO2 concentrations (0%-60%), based on the pressure rise data collected from a cylindrical chamber during combustion, has been developed in this paper. Burning speed has been only reported for flame radii larger than 4 cm in radius in order to have negligible stretch effect. Power law correlations, to predict burning speed of biomass/air mixtures, based on the measured burning speeds, have been developed for a range of temperatures of 300-661 K, pressures of 0.5-6.9 atmospheres, equivalence ratios of 0.8-1.2, and CO2 concentrations 0%-60%. Moreover, the measured laminar burning speeds have been compared with simulation results using a one-dimensional steady-state laminar premixed flame program with GRI-Mech 3.0 mechanism and other available data from literatures. Comparison with existing data has been excellent.
机译：最近，生物质被认为是有价值的替代燃料。在这项研究中测量了生物质/空气火焰的基本特性，即层流燃烧速度。已经在具有两个端部窗口的圆柱形燃烧容器中进行了实验。中央点火已用于启动燃烧过程。能够以每秒40,000帧的速度拍摄照片的高速CMOS相机已用于研究火焰前沿的形态。火焰最初是平滑的，并且随着压力和火焰半径的增加，火焰表面上会出现裂纹和气泡。在本文中，仅报道了光滑火焰的实验结果。本文建立了一个多壳热力学模型，该模型基于燃烧过程中从圆筒形燃烧室收集的压力上升数据，来测量具有变化的CO2浓度（0％-60％）的生物质/空气混合物的层流燃烧速度。仅报告了半径大于4 cm的火焰半径的燃烧速度，以使拉伸效果可忽略不计。在300-661 K的温度，0.5-6.9个大气压的压力，0.8-1.2的当量比，以及300-661 K的温度范围内，已经开发了幂律相关性，以基于测得的燃烧速度来预测生物质/空气混合物的燃烧速度。 CO2浓度为0％-60％。此外，已将测量的层流燃烧速度与使用具有GRI-Mech 3.0机理的一维稳态层流预混火焰程序的模拟结果以及来自文献的其他可用数据进行了比较。与现有数据的比较非常出色。

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  • 来源
    《Journal of Energy Resources Technology》 |2019年第2期|022206.1-022206.12|共12页
  • 作者

    Bai Ziwei; Wang Ziyu; Yu Guangying; Yang Yongping; Metghalchi Hameed;

  • 作者单位

    North China Elect Power Univ, Beijing Key Lab Emiss Surveillance & Control Ther, Beijing 102206, Peoples R China|Northeastern Univ, Dept Mech & Ind Engn, Boston, MA 02115 USA;

    Northeastern Univ, Dept Mech & Ind Engn, Boston, MA 02115 USA;

    Northeastern Univ, Dept Mech & Ind Engn, Boston, MA 02115 USA;

    North China Elect Power Univ, Beijing Key Lab Emiss Surveillance & Control Ther, Beijing 102206, Peoples R China;

    Northeastern Univ, Dept Mech & Ind Engn, Boston, MA 02115 USA;

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

    laminar burning speed; biomass; thermodynamic model;

    机译：层流燃烧速度;生物质;热力学模型;

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