Influence of tunnel shaft height on smoke transport characteristics of high-speed train fires
In order to study the influence of tunnel shaft height on the smoke transport characteristics of high-speed train fires,the RNG k-ε equation model with buoyancy correction and the volumetric heat source model were used to construct a numerical simulation method for high-speed train motion fires in tunnels,and the reliability of the numerical simulation method was verified by dynamic model tests.The results show that for a fire scenario where the train is forced to stop upstream of the shaft,the effect of the shaft height change on the smoke transport characteristics is mainly felt in the later stages of the stop.At 360 s of train stop,the positive peak longitudinal flow velocity in the tunnel vault increases with the increase of shaft height,and the shaft chimney effect is stronger,while the peak temperature in the tunnel vault tends to decrease.In fire scenarios where the train is forced to stop downstream of the shaft,the shaft chimney effect and the piston wind in the tunnel play a dominant role in the transport of fire smoke.At 90 s of train stop,the smoke backflow phenomenon occurs.As the shaft height increases,the peak smoke backflow velocity upstream of the fire source increases and the smoke backflow length first increases and then remains constant.When the shaft height increases from 20 m to 100 m,the time taken for the hot flue gases upstream of the fire source to flow back to the bottom of the shaft decreases by 253 s.At 360 s of train stop,the change pattern of the peak temperature at the tunnel vault changes,and as the shaft height increases from 20 m to 100 m,the peak temperature at the tunnel vault first increases and then decreases.
high-speed train firetunnel shaftmoving fire sourcesmoke movement
周丹、唐健瑜、唐子童
展开 >
中南大学交通运输工程学院,轨道交通安全教育部重点实验室,湖南长沙,410075
中南大学轨道交通安全关键技术国际合作联合实验室,湖南长沙,410075
中南大学轨道交通列车安全保障技术国家地方联合工程研究中心,湖南长沙,410075
高速列车火灾 隧道竖井 移动火源 烟气输运
湖南省自然科学基金资助项目Natural Science Foundation of Hunan Province
万方数据
维普
