CAJ | 학술논문

针对火灾烟颗粒的链状结构特征,采用回转椭球模型,通过"T矩阵法",分析其非球形性对光散射模式的影响.分别在固定取向与随机取向条件下,分析了"扁长"形回转椭球、球体及"扁圆"形回转椭球的散射光强分布.结果表明,在固定取向情况下,半轴比值a/b=1.0的球体对应的散射光强度分布的等高线均为直线;然而,对于半轴比值a/b＜1.0的"扁长"形椭球体对应的散射光强度分布的等高线为凸线,半轴比值a/b＞1.0的"扁圆"形椭球体对应的散射光强度分布的等高线为凹线.在随机取向条件下,球体(a/b=1.0)对应的取向平均散射光强度分布曲线的震荡最为剧烈,而a/b=0.5,2.0,4.0对应的三条曲线表明,非球形性越强的颗粒对应的散射光强分布曲线越平滑.
침대화재연과립적련상결구특정,채용회전타구모형,통과"T구진법",분석기비구형성대광산사모식적영향.분별재고정취향여수궤취향조건하,분석료"편장"형회전타구、구체급"편원"형회전타구적산사광강분포.결과표명,재고정취향정황하,반축비치a/b=1.0적구체대응적산사광강도분포적등고선균위직선;연이,대우반축비치a/b＜1.0적"편장"형타구체대응적산사광강도분포적등고선위철선,반축비치a/b＞1.0적"편원"형타구체대응적산사광강도분포적등고선위요선.재수궤취향조건하,구체(a/b=1.0)대응적취향평균산사광강도분포곡선적진탕최위극렬,이a/b=0.5,2.0,4.0대응적삼조곡선표명,비구형성월강적과립대응적산사광강분포곡선월평활.
A spheroid model was used to characterize the nonspherical morphology of smoke aggregates with an axis ratio a/b. Using the T-matrix method, the relative intensity distributions of the scattered light were analyzed for four spheroids with different a/b in a fixed orientation, as well as in a random orientation. The results indicate that the magnitude contours of the scattered light intensity distribution for spherical particles are straight lines. The corresponding magnitude contours of light scattering patterns would be convex for prolate spheroids (a/b ＜ 1) and be concave for the oblate spheroids (a/b ＞ 1) . The results also show that the orientation-averaged scattered light intensity distribution for a sphere (a/b= 1.0) oscillates much more strongly than those for the other spheroids with a/b of 0. 5, 2.0 and 4.0. The oscillation of orientation-averaged scattered light intensity distributions is an indication for nonspherical particles.