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Transient ellipsoidal combustion model for a porous burner in microgravity
Combustion and Flame ( IF 4.4 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.combustflame.2019.09.030
Akshit Markan , Howard R. Baum , Peter B. Sunderland , James G. Quintiere , John L. de Ris

Abstract The current study develops a transient combustion model formulated in oblate ellipsoidal coordinates to analyze the behavior of non-buoyant burner-generated diffusion flames. The combustion model is axially symmetric and considers a porous gas-fueled burner called the Burning Rate Emulator (BRE), which is idealized as an ellipsoidal disk. An approximate analytical transient solution for the flame shape and heat transfer to the surface of the burner is generated as a product of the exact steady-state result and the asymptotic transient result that becomes exact far from the burner. Microgravity BRE experiments conducted at NASA Glenn's 5.18-s Zero Gravity Research Facility indicated the evolution of an approximately ellipsoidal flame moving away from the burner with steady state not achieved during the 5-second test period. The microgravity experimental results are shown to be in good agreement with the mathematical model, which can help predict the flame behavior beyond the duration of the test.

中文翻译:

微重力条件下多孔燃烧器的瞬态椭球燃烧模型

摘要 当前的研究开发了一种在扁椭球坐标中制定的瞬态燃烧模型,以分析非浮力燃烧器产生的扩散火焰的行为。燃烧模型是轴对称的,并考虑称为燃烧速率模拟器 (BRE) 的多孔气体燃料燃烧器,它被理想化为椭圆盘。火焰形状和燃烧器表面传热的近似解析瞬态解是精确稳态结果和远离燃烧器变得精确的渐近瞬态结果的乘积。在 NASA Glenn 的 5.18 秒零重力研究设施进行的微重力 BRE 实验表明,在 5 秒的测试期间没有达到稳定状态的近似椭圆形火焰的演变远离燃烧器。
更新日期:2020-02-01
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