Analysis Of The Influence Of The Baffle Installed In The Tunnel On The Micro-Pressure Out Of The Tunnel

In our country,increasing the speed of the train is the trend of thetime.However,a series of the aerodynamics problems of the high-speedtrain is to be solved with the speed of the train being increasedcontinuously.For example,the air before the train is compressed when thehigh-speed train enters the tunnel,as a result,a compressive wave will beproduced.Then the compressive wave will travel along the tunnel to theoutlet of the tunnel with the speed of sound.When the compressive wavetravels to the outlet of the tunnel,a micro-pressure wave will be producedand it will be radiated into the field out of the tunnel.Also a noise ofexplosion will be created which does bad damage to the daily life of theresident living around.So it is necessary to study the theory of themicro-pressure wave and the measures to decrease it.In this thesis, we use the numerical method to simulate the processof train entering tunnel.Also,we compare the computational result withthe experimental result by M.S.Howe,which shows our result is a good fitwith the experiments of former research.Then,we analyse the influence of single baffle on the micro-pressurewave,as a result, we obtain the relationship between the width of thebaffle and the micro-pressure wave.On this base,we will have further simulation and analysis about thebaffle structure that two baffles installed in the tunnel.We get therelationship of the distance between two baffles and the micro-pressure IVwave,so as to make the foundation for the analysis of the case,in whichmore baffles will be installed in the tunnel.We make a general analysis ofthe influence of the baffles on the micro-pressure wave by large numbersof cases.In the end,we design a tunnel installed with several baffles,whichhas smaller disaster than the reference case.Then we compare the resultsof the two cases to prove the practicability of the measure.