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Hybrid Lean Blowout Prediction Methodology with Reactive Flow Simulation

机译：带有反应流模拟的混合精益井喷预测方法

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摘要

Robust and accurate prediction tools are required at a component design stage in order to choose the most suitable geometry. Semi-empirical correlations are sufficiently robust to predict lean blowout (LBO) performance of combustors; however, their accuracy is limited due to insufficient modeling depth, which can relate geometric variation with LBO performance. The flame volume concept, which is dynamically linked to the flow structures, spatial interaction of mixing jets, heat evolution, and dissipation in the primary zone, has brought improvements. Nevertheless, its estimation is a challenging task. Previously, it was evaluated from the flammable volume estimation within a cold flow simulation that it needed a correction step. This work extends the hybrid LBO prediction to reactive flow simulations with Reynolds Averaged Navier-Stokes simulations in Fluent platform. In this study, 10 geometric configurations were investigated and their experimental data was presented. Relationship between the flow structures in a primary zone and the global LBO stability was successfully described by defining a 'heat content' parameter. Flame identification criterion was also established and effectively utilized for the flame-volume estimation within reactive flow simulations. As a result, the correction step was eliminated and led to reduction of the iteration loop. Comparison of the simulated and experimental flame volume reported maximum and average errors of +/- 15% and +/- 5%, respectively. The improvement was mainly attributed to the inclusion of reactive flow simulations and the flame identification criterion.
机译：为了选择最合适的几何形状，在组件设计阶段就需要强大而准确的预测工具。半经验相关具有足够的鲁棒性，可以预测燃烧器的稀燃（LBO）性能。但是，由于建模深度不足，它们的准确性受到限制，这可能会使几何变化与LBO性能相关联。火焰体积概念与流动结构，混合射流的空间相互作用，热量散发以及主要区域的散发动态关联，带来了改进。然而，其估计是一项艰巨的任务。以前，根据冷流模拟中的可燃量估算，需要进行校正。这项工作使用Fluent平台中的Reynolds Averaged Navier-Stokes模拟将混合LBO预测扩展到反应流模拟。在这项研究中，研究了10种几何构型并提供了它们的实验数据。通过定义“热含量”参数，成功地描述了主要区域中的流动结构与总体LBO稳定性之间的关系。还建立了火焰识别标准，并将其有效地用于反应流模拟中的火焰量估算。结果，消除了校正步骤，并导致了迭代循环的减少。模拟和实验火焰体积的比较报告最大和平均误差分别为+/- 15％和+/- 5％。改进主要归功于包含了反应流模拟和火焰识别标准。

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  • 来源
    《Combustion Science and Technology》 |2017年第12期|1776-1795|共20页
  • 作者

    Ahmed Ejaz; Huang Yong;

  • 作者单位

    Beihang Univ, Sch Energy & Power Engn, Natl Key Lab Sci & Technol Aeroengines, Collaborat Innovat Ctr Adv Aeroengines, 37 Xueyuan Rd, Beijing 100083, Peoples R China;

    Beihang Univ, Sch Energy & Power Engn, Natl Key Lab Sci & Technol Aeroengines, Collaborat Innovat Ctr Adv Aeroengines, 37 Xueyuan Rd, Beijing 100083, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Flame volume; Gas turbine combustion; Hybrid methodology; Lean blowout;

    机译：火焰量;燃气轮机燃烧;混合方法;精益井喷;

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