分层环境中人体呼出射流预测模型及实验研究

Investigations on the Dispersion of Exhaled Flow in Stratified Environment

本文采用分层水箱模拟温度分层环境中射流流动,验证人员呼出气流积分模型的有效性。将实验观测得到的均匀环境以及分层环境下热射流演化图像与模型预测结果比对,实验表明均匀环境下热射流能够不断浮升,而温度分层环境中热射流浮升到一定高度后沿水平方向震荡和扩散,积分模型的预测结果准确描述了射流发展特征。该水箱分层实验为研究各种大尺度分层流动现象奠定良好的实验基础,为分层环境中人员呼出污染物扩散提供可靠的实验方法。

The tank experiment is applied to simulate the exhaled jet in stratified environment to validate the accuracy of the established exhalation jet model. The comparison between the observation of experiment and the prediction of model shows that thermal jet in uniform environment can freely float up. In stratified tank experiment, the fluctuation of the jet around the lock-up height has been observed consistent with the model prediction, which suggests that model can reveal the characteristic of jet flow in stratified environment. The experiment carried out here has laden the foundation of investigation on the large-scale flow in stratified environment and provided a reliable method to study the dispersion of exhalation jet in indoor environment.