时速400 km高速铁路车隧耦合气动效应研究进展OA

The CR450 Science and Technology Innovation Project has set clear requirements for the development of high-speed railway technologies at 400 km·h-1 and above.As the operating speed of electric multiple units(EMUs)continues to increase,the aerodynamic effects induced during tunnel passage become increasingly significant,affecting operational comfort and safety.Based on a literature review,numerical simulations,and full-scale field tests,this study investigates key technical issues related to high-speed railway tunnels at 400 km·h-1,including reasonable tunnel clearance area,mitigation measures for micro-pressure waves,aerodynamic loads on ancillary facilities,and EMU noise.The results show that when the train sealing index exceeds 17 s,a tunnel with a clearance area of 100 m² can still satisfy the requirements for ride comfort and carbody structural strength during operation at 400 km·h-1.Under the action of compression wave,the peak micro-pressure wave increases sharply when the tunnel length exceeds 4.0 km;therefore,special attention should be paid to mitigation schemes such as reducing the blockage ratio,installing portal mitigation structures,and arranging auxiliary tunnels inside the main tunnel.The recommended positive and negative peak aerodynamic loads on ancillary facilities in 400 km·h-1 high-speed railway tunnels are 3.0 and 4.8 kPa,respectively,under single-train operation,and 6.2 and 10.2 kPa,respectively,under train-crossing operation.After speed enhancement,both interior and exterior noise levels in tunnel environments increase significantly with increasing train speed.The interior and exterior noise levels of passenger cars can reach approximately 80 and 125 dB(A),respectively.Interior noise can be reduced through integrated train-infrastructure design and other coordinated measures.