综合体高压细水雾特性参数的火灾动态模拟

Fire Dynamic Simulation of Complex High Pressure Fine Water Mist Characteristic Parameters

利用建筑信息模型(BIM)技术建立商业综合体3D模型并采用分层转化方式转化为火灾动态模拟(FDS)计算模型,分析大空间综合体超快速火中高压细水雾与火焰相互作用过程,研讨单一喷头Ⅱ级高压细水雾在不同喷射速度、雾化角以及水雾压力因素下与火焰相互作用过程,分析细水雾控火效能。结果表明:雾化角增大一定程度,细水雾控火效能提高;大空间综合体在不同雾化角高压细水雾施加初期造成湍流扰动比受限空间更加剧烈且温度有回升现象,最佳雾化角大于受限空间;喷射速度增大一定量值,降温速率与幅值均增大,充分发展阶段温度震荡幅度及时间区域小;随着压力上升至临界压力,温度回升之后波动小,对火源控制效果越好,当超越临界值,火焰横向扩展并加快高温烟气中一氧化碳(CO)流动。

A form of the 3D model of commercial complex was established by using building information modeling(BIM)technology and transformed into fire dynamic calculation model.The interaction process between high pressure water mist and flame in Superfast fire of large space complex was analyzed.The interaction process between water mist and flame under different injection speed,atomization angle and water mist pressure was studied.The fire control efficiency of fine water mist was analyzed.The results show that the atomization Angle increases to a certain extent,and the fire control efficiency of fine water mist improves.The turbulence caused by the large space complex at the early stage of high pressure water mist at different atomization angles is more severe than that in the limited space and the temperature rally.The optimal atomization Angle is greater than the restricted space.The jet velocity increased by a certain amount,the cooling rate and amplitude both increased,The temperature oscillation amplitude and time region are small in the full development stage.As the pressure rises to the critical pressure,the fluctuation after the temperature rises is small,and the better the control effect on the fire source is,when the critical value is exceeded,the flame expands laterally and accelerates the CO flow in the high-temperature flue gas.