Abstract Radiation has been found to play an important role in opposed-flow flame spread, especially in the low-velocity microgravity environment. To explore the various aspects of flame radiation, an existing comprehensive 2D computational model including gas and surface radiation as well as radiation feedback to the solid is utilized. The comprehensive radiation model is simplified into a number of sub-models: no radiation, gas losses, surface loss, uncoupled (gas and surface losses without feedback). The sub-models are evaluated over the kinetic, thermal, and radiative regimes for a thin PMMA fuel. The resulting spread rates, flame and vaporization temperatures, and flame structures are compared to the comprehensive fully coupled model. The computational results reveal that gas-to-surface feedback moderately enhances spread rate and may affect the critical burnout velocity but has little effect on flame and vaporization temperatures.

中文翻译：

---

对流火焰蔓延不同状态下辐射反馈的数值研究

摘要 已发现辐射在逆流火焰蔓延中起着重要作用，尤其是在低速微重力环境中。为了探索火焰辐射的各个方面，使用了现有的综合二维计算模型，包括气体和表面辐射以及对固体的辐射反馈。综合辐射模型简化为多个子模型：无辐射、气体损失、表面损失、非耦合（气体和表面损失无反馈）。子模型在薄 PMMA 燃料的动力学、热和辐射状态下进行评估。将由此产生的扩散速率、火焰和汽化温度以及火焰结构与全面的完全耦合模型进行比较。