Chen Chun, Liu Wei, Li Fei, Lin Chao-Hsin, Liu Junjie, Pei Jingjing, Chen Qingyan
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA.
School of Environmental Science and Engineering, Tianjin University, 92 Weijin Road, Naikai District, Tianjin 300072, China.
Build Environ. 2013 Apr;62:45-54. doi: 10.1016/j.buildenv.2012.12.020. Epub 2013 Feb 1.
It is important to accurately model person-to-person particle transport in mechanical ventilation spaces to create and maintain a healthy indoor environment. The present study introduces a hybrid DES-Lagrangian and RANS-Eulerian model for simulating transient particle transport in enclosed environments; this hybrid model can ensure the accuracy and reduce the computing cost. Our study estimated two key time constants for the model that are important parameters for reducing the computing costs. The two time constants estimated were verified by airflow data from both an office and an aircraft cabin case. This study also conducted experiments in the first-class cabin of an MD-82 commercial airliner with heated manikins to validate the hybrid model. A pulse particle source was applied at the mouth of an index manikin to simulate a cough. The particle concentrations versus time were measured at the breathing zone of the other manikins. The trend of particle concentrations versus time predicted by the hybrid model agrees with the experimental data. Therefore, the proposed hybrid model can be used for investigating transient particle transport in enclosed environments.
在机械通风空间中准确模拟人际间颗粒传输对于创建和维持健康的室内环境至关重要。本研究引入了一种混合的DES-Lagrangian和RANS-Eulerian模型，用于模拟封闭环境中的瞬态颗粒传输；这种混合模型可以确保准确性并降低计算成本。我们的研究估计了该模型的两个关键时间常数，它们是降低计算成本的重要参数。通过办公室和飞机客舱案例的气流数据验证了所估计的两个时间常数。本研究还在配备加热人体模型的MD-82商用客机头等舱中进行了实验，以验证该混合模型。在一个指示人体模型的嘴部施加脉冲颗粒源以模拟咳嗽。在其他人体模型的呼吸区域测量颗粒浓度随时间的变化。混合模型预测的颗粒浓度随时间的变化趋势与实验数据一致。因此，所提出的混合模型可用于研究封闭环境中的瞬态颗粒传输。
