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微分单元法分析圆柱内各向异性散射介质热辐射
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Journal Article
微分单元法分析圆柱内各向异性散射介质热辐射
2023
Overview
TK124; 自发辐射燃烧诊断技术对获取燃烧系统内高方向分辨率辐射强度有强烈需求.利用微分单元法数值稳定、易于实施的特点,构建一种能在圆柱坐标系各向异性散射介质中,获取角度和空间上高分辨率辐射强度的辐射模型.在模型分析中,将辐射强度进行三维高阶离散;针对辐射传递方程的强对流特性,提出一种迎风方案抑制数值振荡;对于辐射边界存在的强间断奇异点,采用双层节点方案进行捕捉.与解析解对比发现,基于微分单元法的辐射模型能够实现辐射强度的高分辨率刻画,且具有高阶精度;与蒙特卡罗法结果对比,验证了此模型的准确性和有效性.进一步刻画辐射强度在角度和空间上的三维分布,证明迎风方案可以有效抑制数值振荡、实现稳定计算.
Publisher
西北工业大学 太仓长三角研究院,江苏 太仓 215400%长安大学 汽车学院,陕西 西安 710064,西北工业大学 动力与能源学院,陕西 西安 710072%西北工业大学 动力与能源学院,陕西 西安 710072
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