技术中心

【英文篇名】 Airflow simulation in air-conditioned and ventilated rooms with zero-equation model 【作者中文名】 陈晓春; 朱颖心; 王元; 【作者英文名】 Chen Xiaochun~★Tsinghua University; Beijing; China; Zhu Yingxin and Wang Yuan; 【作者单位】 清华大学; 西安交通大学; 【文献出处】 暖通空调, Heating Ventilating 空调通风; 气流组织; 混合长度理论; 双方程K-ε湍流模型; 【英文关键词】 zero-equation model; air conditioning and ventilation; air distribution; mixing length theory; K-ε two equation model; 【摘要】 为了对Chen提出的零方程模型进行评价,研究了三种典型的空调通风房间气流组织工况(强迫对流、混合对流和自然对流),同时采用Prandtl的混合长度理论和双方程K-ε湍流模型的计算结果作为比较。研究表明,总体来说Prandtl的混合长度理论能够获得比Chen的零方程模型更好的结果;从这两种零方程模型的构造分析,Prandtl混合长度理论较为合理,但Chen的零方程模型更容易收敛。相对于双方程K-ε湍流模型,零方程模型仍属于低级模型,计算精度有限,但它能极大地节约计算资源。 【英文摘要】 Evaluates the zero-equation model provided by Chen based on CFD simulation of three typical airflows(forced convection,mixed convection and natural convection)in air-conditioned and ventilated rooms.The simulation results by applying zero-equation model are compared with those by adopting Prandtl mixing length theory and K-ε two equation model.The results show that Prandtl mixing length theory predicts airflows better than zero-equation model provided by Chen,and that Prandtl mixing length theory is more re...