JIAO Qizhu, ZHANG Mingju, XIONG Xiaohui, et al. Aerodynamic characteristics of medium-low-speed maglev trains during intersection in two-track tunnel[J]. Electric drive for locomotives,2024(3): 61-69.
JIAO Qizhu, ZHANG Mingju, XIONG Xiaohui, et al. Aerodynamic characteristics of medium-low-speed maglev trains during intersection in two-track tunnel[J]. Electric drive for locomotives,2024(3): 61-69.DOI:10.13890/j.issn.1000-128X.2024.03.008.
Aerodynamic characteristics of medium-low-speed maglev trains during intersection in two-track tunnel
为探明速度140 km/h的中低速磁浮列车在双线隧道内交会时隧道壁面和车体表面压力变化情况,文章采用数值计算方法研究了车/隧不同参数对隧道壁面和车体表面气动性能的影响,并对比了不同编组长度的列车和不同隧道净空面积对列车车内压力的影响。研究结果表明,4车编组的磁浮列车在双线隧道中部交会时,隧道壁面测点的压力变化峰峰值与隧道净空面积的1.379次方成反比,车体表面压力测点的变化峰峰值与隧道净空面积的1.231次方成反比。当隧道净空面积为66.2 m
In order to investigate pressure variations on both the tunnel wall and train body surface when 140 km/h medium-low-speed maglev trains intersect in two-track tunnels
numerical calculations were performed
focusing on the effects of different parameters of the train/tunnel on the aerodynamic performance of the tunnel wall and train body surface. Moreover
a comparison was conducted across different train consist lengths and various tunnel clearance areas to assess their effects on internal train pressures. The results indicated an inversely proportional relationship between the peak value of pressure variations at measuring points on the tunnel wall and the 1.379th power of the tunnel clearance area
as well as between the peak value of pressure variations at measuring points on the train body surface and the 1.231st power of the tunnel clearance area during the intersection of 4-car maglev trains in the middle section of two-track tunnels. Additionally
under an airtightness index of 0.5 s
the pressure variations over 3 s at measuring points inside 8-car trains
resulting from the intersection in tunnels with a tunnel clearance area of 66.2 m
2
increased by 102.2%
compared with the 4-car scenarios. Under an airtightness index of 8 s
this figure decreased to 50.4%. The study findings of this paper provide a reference basis for the construction of tunnels to accommodate the operation of medium-low-speed maglev trains.
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