Modeling and Assessment of Buoyancy-Driven Stratified Airflow in High-Space Industrial Hall

In industrial environment,heat sources often are contaminant sources and health threatening con-taminants are mainly passive,so a detailed understanding of airflow mode can assist in work environment hy-giene measurement and prevention.This paper presented a numerical investigation of stratified airflow scenario in a high-space industrial hall with validated commercial code and experimentally acquired boundary conditions.Based upon an actually undergoing engineering project,this study investigated the performance of the buoyancy-driven displacement ventilation in a large welding hall with big components manufactured.The results have demonstrated that stratified airflow sustained by thermal buoyancy provides zoning effect in terms of clean and polluted regions except minor stagnant eddy areas.The competition between negative buoyant jets from displace-ment radial diffusers and positive buoyant plume from bulk object constitutes the complex transport characteris-tics under and above stratification interface.Entrainment,downdraft and turbulent eddy motion complicate the upper mixing zone,but the exhaust outlet plays a less important role in the whole field flow.And the corre-sponding suggestions concerning computational stability and convergence,further improvements in modeling and measurements were given.     

新型自动捕风排风装置排风口性能优化

基于自然通风原理,对所研制的自动捕风排风装置的通风性能进行了优化分析.通过数值模拟和实验研究,重点分析了排风口几何形状与其表面自然通风风压系数的关系,以及提高其排风性能的关键参数.研究结果表明,圆锥形渐扩口的综合排风性能为最佳,较无渐扩口的排风口可提高排风量14.3％;所研制的自动捕风排风装置在北京地区冬季典型天利用自...