通风方式对大空间火灾吸气式烟雾探测效果的影响

The Influence of Ventilation Mode on Aspirating Smoke Detection for Large Space Fire

采用模拟仿真技术分析大空间发生火灾时,不同机械通风方式下,烟雾流动的特征规律,在一个防火分区内计算2种机械通风方式下探测响应时间。结果显示,侧面送风方式响应时间较顶上送风方式长,侧面送风对整个空间烟雾扩散影响较大,在侧面送风方式下,可以采用较小间距的采样孔布置方案,以提高探测效率,缩短响应时间。

By modeling and simulation of the fire scenario for large space, the characteristics of smoke flow with different mechanical ventilation mode was analyzed, and the detection response times using two ,Jentilation modes in the same fire compaxt- ment was calculated. Results demonstrated that the response time with sidewall air supply is longer than roof air supply, and the way of sidewall air supply plays an important role in the smoke spread in whole space, with which the smaller distance layout pat- tern of sampling aperture could be used to improve the detection efficiency and reduce the response time.