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管壁带凸肋板和凹槽的通风管内颗粒沉降研究 预览

Numerical Investigation of Particle Deposition in Ventilation Ducts with Convex or Concave Wall Cavity
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摘要 本文研究了管壁带内凸肋板、外凹槽的通风管内颗粒物沉降规律。结果表明,所采用的模型能准确地预测通风管内气流流动和颗粒物沉降特性。管壁上增加内凸、外凹槽,都有利于提高颗粒物的沉积速度。在湍流扩散区、涡扩散碰撞区,内凸、外凹槽通风管内颗粒沉积相比于光滑管约能增强2~4个数量级。在惯性力区,由于颗粒粒径较大,其运动主要受惯性力主导,增幅较缓。因此,增设内凸、外凹槽的通风管对强化管内小粒径的颗粒物的沉积更有利。此外,相比于增设外凹槽的通风管,带内凸肋板的通风管内的颗粒沉降速度增幅相对更大。 This paper investigated the particle deposition in ventilation ducts with convex or concave wall cavity. The results indicates that the models adopted in this paper can accurately predict the characteristics of the air flow and particle deposition. The addition of convex and concave wall cavity are both beneficial for enhancing the particle deposition. Compared with smooth duct, the particle deposition can be strengthened about 2 to 4 orders of magnitude by the addition of convex and concave wall cavity in the turbulent diffusion and eddy diffusion-impaction regimes, whereas in the inertia-moderated regime, it increases comparatively slowly because movements of the large diameter particles are dominated by the inertia force. Thus, adding convex or concave wall cavity to the ducts is more beneficial for enhancing the particle deposition of the particles at small diameters. In addition, the ventilation ducts particle deposition velocity increase in convex wall cavity ducts is relatively larger than in concave wall cavity ducts.
作者 魏苗苗 王飞飞 徐新华 王劲柏 WEI Miao-miao, WANG Fei-fei, XU Xin-hua, WANG Jin-bo (Department of Building Environment and Energy Engineering, Huazhong University of Science & Technology)
出处 《建筑热能通风空调》 2017年第8期5-9,76共6页 Building Energy & Environment
基金 国家自然科学基金(No.51506069),中央高校基本业务费(HUST2015069,2016YXMS286)
关键词 数值模拟 风管 颗粒物 沉降速度 numerical simulation, ventilation duct, particle, deposition velocity
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