Study On Power Matching Of Tunnel Ventilation In Urban Rail Traffic

The modern city’s traffic problem is increasingly serious because of theacceleration of the urbanization process and the rapid increase in urban population.Urban rail transit as an energy efficient transport mode has been considerabledevelopment. Urban rail transit tunnel ventilation design, especially the design of theemergency ventilation system as one side on the design of urban rail transit, in order toensure the safety of person and the stability of equipment, played an important role.TVF, TEF and JET formed urban rail transit tunnel emergency ventilation system.Through analysing the different characteristics of the three fans, focusing on analysingJET’s working principle and characteristics, got urban rail transit tunnel emergencyventilation power matching methods by studying different forms of the tunnel.In this paper, the underground sections niche tunnel jet ventilation effect ofChongqing subway was been numerically simulated. Simulated operation condition oftwo JETs groups of different installation spacings in series, got different tunnel averagevelocities. Combined with the simulated average induced length, the relationshipbetween the induced length and velocity ratio was got. Simulating the train blockingstop at different locations in the tunnel conditions, when the train affected the suctionconditions and induced development of the fan at the same time, jet booster effect wasbad.Measured the tunnel jet ventilation of Shenzhen metro underground sections, testresults show that internal pressure and speed field was fit with the result of simulation,the actual increase pressure was fit with theoretical analysis results, the test accumulatedof the basic datas for the guidance of urban rail transit tunnel ventilation design andoperation optimization.Analysed the characteristics of the metro underground section tunnels, and gavethe three operating conditions encountered by the train running in the tunnel, analysisedthe fire processes with emphasis. The tunnel section is divided into nine types based onthe characteristics of the tunnel section. Combined with accident conditions and effectof the power system type, it will be reduced to three categories, and the representativerepresentatives of concrete analysis, the use of the law of conservation of energy andcontinuity equation and combined with zero pressure point design thought, getventilation system dynamic matching method.