零方程模型用于空调通风房间气流组织数值模拟的研究

Airflow simulation in air-conditioned and ventilated rooms with zero-equation model

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。

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 reasonable than zero-equation model provided by Chen but Chen＇s model seems easier to converge from the analyses of their construction. Compared with K-ε two equation model, zero-equation model with low accuracy is still a low-level model, but it can save much computing cost.