Numerical study of the fire-smoke temperature law in the shaft of a high-rise building under the chimney effect in winter

Shaft structures in high-rise buildings may increase fire coverage due to chimney effects. However, few previous studies have considered the motion of flue gas under combined effect and thermal buoyancy. So, we set a continuous gradient differential pressure opening based on characteristics winter. The CFD method is used simulate 12 operating conditions with different source locations rates heat release from ignition source. We compare analyze temperature rise, rise law variation difference between inner outer shafts for powers. results show that, case low-floor fires, range appreciation fluctuation at local measurement point increases power distribution decreases height. relationship dimensionless time height layer exponential position conditions. causes neutral surface shift, below original surface, higher source, more pronounced shift surface.