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基于改进SGS-TRI模型的湍流燃气射流红外辐射特性数值研究

郝健辛1,王强2,胡海洋3   

  1. 1. 北京航空航天大学
    2. 北航航空航天大学能源与动力工程学院
    3. 北京航空航天大学能源与动力工程学院
  • 收稿日期:2024-11-19 修回日期:2025-01-26 出版日期:2025-02-06 发布日期:2025-02-06
  • 通讯作者: 胡海洋
  • 基金资助:
    国家科技重大专项

Numerical study on infrared radiation characteristics of turbulent gas jets based on improved SGS-TRI model

  • Received:2024-11-19 Revised:2025-01-26 Online:2025-02-06 Published:2025-02-06
  • Contact: hai yangHU

摘要: 针对现有模化方法对燃气射流SGS-TRI(sub-grid scale Turbulence-Radiation Interaction)特性预测精度过低的问题,在亚格子Snegirev关系式中引入辐射参与性组分与温度的关联脉动项;同时建立全新的、更易于在复杂工程计算中应用的动力亚格子模型系数求解算法,求解动力Smagorinsky模型与温度方差模型系数;并通过各向同性湍流的DNS计算及高温空气射流流动特性测试数据验证上述算法的合理性。在此基础上,结合多线组宽带k分布模型,计算分析了轴对称排气系统燃气喷流3-5微米波段红外信号的TRI特性与SGS-TRI特性随探测距离的变化规律,并利用多线组宽带模型的特性解释上述现象的形成机理。

关键词: 湍流脉动, 燃气射流, 亚格子模型, SGS-TRI, 红外辐射特性

Abstract: To address the issue of low prediction accuracy of gas jet SGS-TRI properties associated with existing modeling meth-ods, we introduced a correlation fluctuation term that accounts for the interaction between radiation-participating com-ponents and temperature into the sublattice Snegirev relationship. Simultaneously, we established a new model that is more user-friendly for complex projects. The algorithm employed for solving the dynamic subgrid model coefficients facilitates the calculation of the dynamic Smagorinsky model and temperature variance model coefficients. The validity of this algorithm is confirmed through direct numerical simulations (DNS) of isotropic turbulence and high-temperature air jet flow characteristic test data. Building on this foundation, we utilized the multi-line group broadband k distribution model to calculate and analyze the TRI properties and SGS-TRI properties of the 3-5 micron band infrared signal of the gas jet within an axisymmetric exhaust system, considering the detection distance. The properties of the line group broadband model elucidate the formation mechanism of the observed phenomena.

Key words: turbulent fluctuation, gas jet, sub-grid model, SGS-TRI, infrared radiation properties

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