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首页> 外文期刊>Fuel >Large Eddy Simulation of a laboratory-scale gas-assisted pulverized coal combustion chamber under oxy-fuel atmospheres using tabulated chemistry
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Large Eddy Simulation of a laboratory-scale gas-assisted pulverized coal combustion chamber under oxy-fuel atmospheres using tabulated chemistry

机译：使用列表化学方法在含氧燃料气氛下对实验室规模的气体辅助粉煤燃烧室进行大涡模拟

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摘要

This paper analyses a new gas-assisted pulverized coal combustion chamber, specially designed for the validation of numerical models under oxy-fuel atmospheres. For this purpose, an overall method is developed based on Large Eddy Simulation (LES) for oxy-fuel pulverized coal combustion chambers. One essential aspect of this is the embedding of a 4D Flamelet Generated Manifold (FGM) table coupled with an artificially thickened flame (ATF) model in the Euler-Lagrange (EL) framework. The four dimensions of the generated manifold represent the finite rate chemistry, mixing of volatiles, and char products and heat losses in the gas phase. Before the model is applied in the combustion chamber, its validity is demonstrated utilizing verification cases. Subsequently, the simulation results of the combustion chamber are validated and discussed with the help of the available measurement data. Operating points with increasing complexity are investigated, starting with a single-phase case that analyzes the reproduction of the assisting methane flame based on tabulated chemistry coupled with ATF. For the validation process, velocity fields from Particle Image Velocimetry (PIV) are used as well as flame positions from planar laser-induced fluorescence of the OH radical (OH-PLIF). Subsequently, operating conditions using different coal mass flows are investigated. To validate the flame stabilization mechanism, velocity data for the near burner region are available. Further examinations of the gas-assisted coal flame are carried out, in particular the influence of the coal particles on the flame stabilization mechanism is carried out.
机译：本文分析了一种新型的气体辅助煤粉燃烧室，该燃烧室是专门为验证含氧燃料气氛下的数值模型而设计的。为此，基于大涡模拟（LES）开发了一种用于氧燃料粉煤燃烧室的总体方法。其中一个重要方面是在Euler-Lagrange（EL）框架中嵌入4D Flamelet生成歧管（FGM）表以及人工增厚火焰（ATF）模型。生成的歧管的四个尺寸分别表示有限速率化学，挥发物和炭产物的混合以及气相中的热损失。在将模型应用于燃烧室之前，将通过验证案例来证明其有效性。随后，借助可用的测量数据对燃烧室的模拟结果进行验证和讨论。从单相案例开始，对复杂性不断增加的工作点进行了研究，该案例基于列表化学与ATF结合来分析辅助甲烷火焰的重现性。对于验证过程，使用了来自粒子图像测速（PIV）的速度场以及来自平面激光诱导的OH自由基（OH-PLIF）的火焰位置。随后，研究了使用不同煤质流量的运行条件。为了验证火焰稳定机制，可获得燃烧器附近区域的速度数据。进一步检查了气体辅助煤的火焰，特别是煤颗粒对火焰稳定机理的影响。

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  • 来源
    《Fuel》 |2020年第jul15期|117683.1-117683.16|共16页
  • 作者

  • 作者单位

    Inst Energy & Power Plant Technol Otto Berndt Str 3 D-64287 Darmstadt Germany;

    Inst React Flows & Diagnost Otto Berndt Str 3 D-64287 Darmstadt Germany;

    Simulat React Thermofluid Syst Otto Berndt Str 2 D-64287 Darmstadt Germany;

    Chair Thermal Turbomachines & Aeroengines Univ Str 150 D-44801 Bochum Germany;

  • 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

    Pulverized coal combustion; Oxy-fuel; FGM tabulated chemistry; Large Eddy Simulation;

    机译：煤粉燃烧;含氧燃料FGM列表化学;大涡模拟;

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