Experimental study on combustion parameters and temperature distribution of linear fire under different oxygen concentration in tunnel

Many cables are placed in the underground utility tunnel, which with greater fire hazards. Once occurs an enclosed thermal radiation may ignite adjacent cables, will cause cable and further expanding of scale, oxygen be consumed over time. Thus, it's important to investigate under low concentration. In this paper, a experiment has carried out reduced-scale tunnel different heights linear near side wall. The combustion parameters, as well transverse temperature distribution maximum ceiling rise concentration investigated. Based on consumption calorimetry, efficiency heat release rate each source can obtained. And two formulas predict proposed based dimensionless analysis. Results show that parameters changing varies concentrations, peaks exist cross section highest is directly above source. Conclusions given provide references protection work tunnel.