Analysis on shockwave flow field characteristics of maglev train passing each other in low vacuum tube
In order to solve the aerodynamic effects problem,such as shock waves,during the high-speed operation of pipeline trains,a three-dimensional simulation model was established and the unsteady numerical simulation was carried out based on DES turbulence model under the condition of different blocking ratios,line spacings and train shapes,and the shock flow field structure,pipeline wall pressure and train surface pressure when trains meet in a low vacuum pipeline were analyzed.The results show that with the increase of congestion ratio,the length of congestion at the front end of the train and the pressure in the positive pressure area increase.The shock wave reflection is more intense,the wake shock wave reflection intensity increases,and the shock wave string length lengthens.The increase of blocking ratio helps to increase the incidence angle of shock wave and expansion wave,which increases the number of shock wave and expansion wave reflections.With the increase of line spacing,the fluctuation range of the pressure inside the pipeline increases relatively,but the change of line spacing has little effect on the structure of the shock flow field inside the pipeline,the wall pressure of the pipeline and the surface pressure of the train.With the increase of the length of the train streamline,the length of the congestion at the front of the train is shortened,and the intensity of the congestion in the high-pressure area at the front of the train and the shock wave reflection in the wake area at the end of the train are reduced.
国家科技期刊平台
NSTL
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