Optimization of bridge windbreak on high-speed railway through strong wind area

摘要

Based on 3-d, uncompressible onflow model with steady N-S equation and the k-epsilon double equation, aerodymic characteristics of EMU and windbreaks on bridge under cross wind were studied numerically, the results show: (1) compared to no windbreak, EMU overturning moment was decreased 50% by setting general windbreak , 75% by setting ventilated windbreak;;ventilated windbreak's protective effect on train and pantograph-catenary system is better especially when H>2.5m ;;(2) aerodynamic load on ventilated windbreak is far lower than general windbreak;;(3)the higher cross-wind velocity is, the more aerodynamic load decreased when setting ventilated windbreak. Besides, ventilated windbreak's leak form could significantly reduce bridge's self gravity and wind load, improve wind break ability and EMU operation safety.