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单侧有限宽度开缝竖通道内的旋转热流体特性

DOI: 10.3969/j.issn.1006??7043.201303025

Keywords: 竖直通道, 受限侧开缝, 旋转火焰, 热流体

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Abstract:

为了掌握竖直通道内的旋转火焰特性及其与通道壁面开口条件的关系,在9 m高的竖通道内通过实验确定了可形成旋转火焰的侧开缝宽度范围,并对通道4 m高度以上的侧开缝宽度限制时的旋转热流场进行了数值模拟。研究发现,限制上部侧开缝宽度后会使通道下部的气体流速和火焰附近的旋转速度加大,从而使旋转力对流场的作用较浮力增大,并使流场旋转中心偏移;与上部开缝宽度未受限时相比,开缝受限使其中性面的高度降低,整个中性面的倾角减少至几乎为零,而且在开缝的靠近前端壁面一侧处,流进通道的气体流速由侧开缝未受限时的随着开口宽度的增加而降低变为随着开缝宽度的增加而增加。

References

[1]  CHOW W K, HAN S S. Experimental data on scale modeling studies on internal fire whirls. International Journal on Engineering Performance?Based Fire Codes, 2011, 10(3): 63?74. [2]SNEGIREV A Y, MARSDEN J A, FRANCIS J, et al. Numerical studies and experimental observations of whirling flames. International Journal of Heat and Mass Transfer, 2004, 47(12/13): 2523?2539.(下转第377页) [3]CHOW W K, HAN S S. Experimental investigation on onsetting internal fire whirls in a vertical shaft. Journal of Fire Sciences, 2009, 27(6): 529?543.? [4]HUO Yan, CHOW W K, GAO Ye. Internal fire whirls induced by pool fire in a vertical shaft ASME/JSME 2011 8th Thermal Engineering Joint Conference (AJTEC2011) .Hawaii, USA, 2011:T20034?6.? [5]霍岩, 郜冶. 双侧对开缝竖直通道内热驱动流运动特性. 燃烧科学与技术, 2013, 19(1): 54?59.? HUO Yan, GAO Ye. Motion characteristics of thermal fluid in a vertical channel with double opposite corner gaps. Journal of Combustion Science and Technology, 2013, 19(1): 54?59.? [6]霍岩. 有限开口空间热驱动流大涡模拟和实验研究\[D\]. 哈尔滨: 哈尔滨工程大学, 2010: 8?15.? HUO Yan. Research on thermal fluid in partially open enclosure by large eddy simulation and experiments. Harbin: Harbin Engineering University, 2010: 8?15.? [7]MCGRATTAN K B, HOSTIKKA S, FLOYD J E, et al. Fire dynamics simulator (Version 5), technical reference guide. NIST special publication 1018?5. Maryland:National Institute of Standards and Technology, 2010:15?58.? [8]MCGRATTAN K B, HOSTIKKA S, FLOYD J E. Fire dynamics simulator (Version 5), user’s guide. NIST special publication 1019?5. Maryland:National Institute of Standards and Technology, 2010:35.? [9]WANG H Y. Numerical study of under?ventilated fire in medium?scale enclosure. Building and Environment, 2009, 6 (44): 1215?1227.? [10]PEACOCK R D, RENEKE P A, DAVIS W D, et al. Quantifying fire model evaluation using functional analysis. Fire Safety Journal,1999, 33: 167?184.

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