FDS软件在有限空间机械通风模拟中的应用研究

Study on application of FDS software in numerical simulation of forced ventilation in confined spaces

为指导有限空间机械通风,使用FDS软件研究机械通风过程中供热有限空间内流场、浓度场、温度场等的分布规律,同时将FDS软件模拟结果与FLUENT软件所得模拟结果进行对比分析。结果表明:机械通风过程中,检查室内风速总体较大,管沟内风速相对较小;各测点O_(2)浓度、CO_(2)浓度最终恢复至正常的时间相同,可仅以O_(2)浓度恢复情况作为衡量通风效果的代表气体;采用FDS软件获得模拟结果与FLUENT软件较一致,但在风流的湍流细节方面FDS软件结果更理想。

To guide the forced ventilation of confined spaces,the FDS software was used to study the distribution of flow field,concentration field and temperature field in the confined space for heat supply during the process of forced ventilation,and the simulation result were compared with those obtained by the FLUENT software.The results showed that during the process of forced ventilation,the airflow velocity in the examination room was generally high,and that in the pipe trench was relatively low.The time for the oxygen concentration and carbon dioxide concentration returning to normal finally at each measurement point were the same,and it could only take the recovery of oxygen concentration as the representative gas to measure the ventilation effect.The simulation results of FDS software were consistent with those obtained by FLUENT software,but the turbulent details of airflow could be better simulated by FDS software.