用计算流体动力学方法求解通风房间的空气年龄

Calculating air age in a ventilated room with CFD method

为了替代示踪气体方法评价室内空气品质和通风有效性，在示踪气体研究方法的基础上，推导出空气年龄的输运方程，用计算流体力学的方法对该方程进行了求解。计算结果表明，用数值方法得到的空气年龄与他人的实验结果吻合较好，可以代替示踪气体测量方法。

To evaluate indoor air quality and ventilation effectiveness instead of tracer gas technique, a new method to obtain air age is presented. The transport equation of air age is derived based on tracer gas technique. The form of this equation is the same as the general transport equation and can be solved numerically with the computational fluid dynamics (CFD) method. The numerical results in a ventilated chamber are compared with the test data by Sandberg and Sjoberg. It is shown that the predicted results agree well with the test data, which means that the CFD method is another way to get air age instead of tracer gas.