基于改进SGS-TRI 模型的湍流燃气射流 红外辐射特性

To address the issue of low prediction accuracy of gas jet Sub-Grid Scale Turbulence-Radiation Interaction (SGS-TRI) properties with the existing modeling methods, a correlation fluctuation term that accounts for the interac-tion between radiation-participating components and temperature into the sublattice Snegirev relationship is introduced. Simultaneously, a new and more user-friendly model for complex projects is established. The algorithm solving the dy-namic sub-grid model coefficients facilitates the calculation of the dynamic Smagorinsky model and temperature vari-ance model coefficients. The validity of this algorithm is confirmed through Direct Numerical Simulations (DNS) of iso-tropic turbulence and high-temperature air jet flow characteristic test data. Furthermore, considering the detection dis-tance, the TRI properties and SGS-TRI properties of the 3-5 μm band infrared signal of the gas jet from an axisymmet-ric exhaust system are calculated and analyzed by utilizing the multi-scale multi-group wide-band k-distribution model. The properties of the multi-line group wide band model elucidate the formation mechanism of the observed phenomena.