隧道火灾羽流质量流量计算公式的研究

The Research on the Calculation Formulas of Mass Flow Rate of Fire Plume in Tunnels

通过FDS软件模拟不同隧道火灾工况,得出了不同高度处隧道火灾羽流质量流量,在将模拟值与NFPA92B轴对称羽流模型计算值,CIBSE线性火源羽流模型计算值对比的同时,提出了CIBSE线性火源羽流修正模型,并将修正模型计算结果与模拟值进行对比分析。结果表明,在常见隧道火灾工况下,CIBSE线性火源羽流模型计算值与模拟值差别较大,NFPA92B模型计算值总体上更接近模拟值,但在部分火灾工况下与模拟值差别较大,而CIBSE修正模型计算值则与模拟值较为接近,具有良好的工程应用前景。

Several fires in tunnel have been simulated through FDS and different mass flow rates are acquired; while comparing these values with calculated values obtained through NFPA92 B plume model and CIBSE linear plume model, an amendment model of CIBSE model was presented and the amendment model values are compared with the simulation results. The results show that under the normal fire conditions, there are great differences between the CIBSE model values and simulation values and little difference between the NFPA92 B model values and simulation values as a whole. As a result, the amendment model of CIBSE values are close to the simulation values and possess a good prospect of engineering application.