| In recent years,the problem of traffic congestion in Handan has become increasingly prominent.Therefore,Handan has gradually promoted the construction of urban rail transit to alleviate this problem.Handan intends to adopt the straddle-type monorail traffic system,and its track beams are mostly prefabricated components,which greatly shortens the construction period and is conducive to environmental protection.In addition,the traffic system has the advantages of low cost and less land occupation.However,it generally runs on high viaducts,and the lateral wind response during vehicle operation is obvious,which is prone to accidents such as overturning,rollover and derailment.So it is necessary to study the aerodynamic characteristics of straddle-type monorail vehicle under crosswind.This thesis takes Handan new straddletype monorail vehicle as the research object,establishes its numerical model,and uses Fluent software to simulate the aerodynamic characteristics.The main research contents include:(1)The surface pressure distribution and external flow field characteristics of the straddle-type monorail vehicle running in the crosswind environment are calculated and simulated.The pressure and velocity distribution diagram are obtained,and compared with the vehicle under no crosswind environment and the vehicle static condition under crosswind environment.(2)By changing the parameters such as vehicle speed,wind speed and wind direction angle,the influence of them on the aerodynamic load of straddle-type monorail vehicle is studied,and the variation law of aerodynamic load is analyzed.(3)The flow field characteristics of the train-windscreen system are simulated by setting solid and fence windscreens respectively.The pressure distribution diagram,velocity distribution diagram and track diagram of the vehicle wind field are calculated,and compared with the vehicle wind field without windscreen.(4)By changing vehicle speed and crosswind velocity,the flow field distribution of train-windscreen system is studied,and its influence on aerodynamic coefficients of vehicle and windscreen is analyzed.(5)The wind-retaining effect of solid windscreens with different heights is studied.(6)The wind-retaining effect of fence windscreens with different heights and different ventilation rates is studied,and the windscreen form with better wind-retaining effect is determined. |
