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首页> 外文期刊>Atmospheric environment >Evolution of contaminant distribution at steady airflow field with an arbitrary initial condition in ventilated space
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Evolution of contaminant distribution at steady airflow field with an arbitrary initial condition in ventilated space

机译：通风空间中任意初始条件下稳定气流场中污染物分布的演变

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摘要

Transient contaminant dispersion is of high importance to human comfort, health and safety. Lumped parameter model is usually applied to predict the evolution of contaminant dispersion, which, however, will not be effective when the contaminant distribution is not uniform. When airflow field is steady, the contaminant concentration distribution versus time will be determined by the concentration of supply air, contaminant source and initial concentration distribution in the ventilated space. An analytic expression of distributed contaminant concentration was developed using the accessibility of supply air (ASA), accessibility of contaminant source (ACS) and accessibility of initial condition (AIC). The ASA, ACS and AIC describe the contribution of supply air, contaminant source and initial condition to any point in ventilated space, and are determined by the airflow field if the contaminant sources and initial distribution are given. The analytic expression was validated by the tracer gas measurement in a test chamber. Based on the application of the expression in typical cases, the differences as well as connections between the analytic expression and lumped model were discussed. It is shown that the analytic expression is helpful for the understanding of the contaminant evolution process and may be used to obtain effective ventilation strategy for comfort and emergency.
机译：瞬态污染物扩散对人类的舒适度，健康和安全至关重要。集总参数模型通常用于预测污染物扩散的演变，但是，当污染物分布不均匀时，该模型将无效。当气流场稳定时，污染物浓度分布随时间的变化将由送风的浓度，污染物源和通风空间中的初始浓度分布决定。利用送风的可及性（ASA），污染物的可及性（ACS）和初始条件的可及性（AIC）开发了分布的污染物浓度的解析表达式。 ASA，ACS和AIC描述了送风，污染物源和初始条件对通风空间中任何点的影响，如果给出了污染物源和初始分布，则由气流场确定。通过在测试室中进行示踪气体测量来验证分析表达式。基于典型情况下表达式的应用，讨论了解析表达式与集总模型之间的差异以及联系。结果表明，解析表达式有助于理解污染物的释放过程，并可用于获得有效的通风策略，以达到舒适和紧急的目的。

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