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首页> 外文期刊>Combustion Science and Technology >Large-Eddy Simulation of High-Speed Vaporizing Liquid-Fuel Spray Using Mixed Gradient-Type Structural Subgrid-Scale Model
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Large-Eddy Simulation of High-Speed Vaporizing Liquid-Fuel Spray Using Mixed Gradient-Type Structural Subgrid-Scale Model

机译：使用混合梯度型结构亚级模型的高速汽化液 - 燃料喷雾大型涡流模拟

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摘要

The accuracy of the large-eddy simulation (LES) of high-speed vaporizing sprays is highly dependent on the choice of subgrid-scale (SGS) models. This study adopts a nonlinear SGS stress model to simulate a well-known high-speed non-reacting vaporizing liquid-fuel spray case, Spray A. An advantage of using the nonlinear structural SGS model is that it can provide reverse energy transfer from small to large scales, and thus, the model can be more accurate than traditional eddy-viscosity models at capturing cross-scale interactions between turbulence and spray. Also, the adopted gradient-type approach is very computationally efficient. To understand the performance of the nonlinear LES framework, this study presents comprehensive comparisons against experimental data and results obtained using the Smagorinsky model and the sub-grid kinetic energy model. In particular, we compare the general structure of the flows, liquid and vapor penetrations, and mass fraction profiles. Results using the nonlinear structural SGS stress model show minimal dependence on the grid size regarding the capture of flow structures. Using the same mesh resolution, the statistics of the simulated field exhibit both good agreement with measurements and a significant improvement over simulations based on the other two types of models. Results support the assertion that the proposed nonlinear LES framework can accurately achieve direct injection simulations with reasonable computational costs.
机译：高速蒸发喷雾的大涡模拟（LES）的准确性高度依赖于划分级（SGS）模型的选择。本研究采用非线性SGS应力模型来模拟众所周知的高速非反应汽化液 - 燃料喷雾盒，喷雾A.使用非线性结构SGS模型的优点是它可以提供从小到的反向能量转移大规模，因此，在捕获湍流和喷雾之间的横垢相互作用时，模型可以比传统的涡流模型更准确。此外，采用的梯度型方法非常有效地高效。要了解非线性LES框架的性能，本研究提出了针对实验数据的全面比较和使用SMAGORINSKY模型和子网动能模型获得的结果。特别是，我们比较流动，液体和蒸气渗透的一般结构和质量分数型材。使用非线性结构SGS应力模型的结果显示对捕获流动结构的电网尺寸的最小依赖性。使用相同的网格分辨率，模拟字段的统计数据与测量结果以及基于其他两种类型的模型对模拟的显着改进。结果支持提出的非线性LES框架可以通过合理的计算成本准确实现直接注射模拟的断言。

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  • 来源
    《Combustion Science and Technology》 |2021年第8期|762-783|共22页
  • 作者

    Shao Shujing; Lu Hao; Wang Zhaowen; Cheng Xiaobei;

  • 作者单位

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Energy & Power Engn State Key Lab Coal Combust Wuhan 430074 Hubei Peoples R China;

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

    Large-eddy simulation; spray; sub-grid scale;

    机译：大涡模拟;喷雾;子网格尺度;

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