Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1054-1062.doi: 10.13229/j.cnki.jdxbgxb20180172

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Pressure pulse on windbreak impacting by cross⁃wind coupling with high⁃speed trains passing each other

Run⁃dong LIU1(),Jun MAO1(),Yan⁃hong XI1,Hong⁃yu ZHANG1,Fei PENG2   

  1. 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044，China
    2. People Air Defense Office of Gushi County of Henan Province, Xinyang 465200，China
  • Received:2018-02-16 Online:2019-07-01 Published:2019-07-16
  • Contact: Jun MAO E-mail:14115264@bjtu.edu.cn;jmao@bjtu.edu.cn

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Abstract:

The pressure pulse caused by high?speed trains passing each other produces aerodynamic impact on the windbreak, that may result in structural instability of the windbreak and bring security risks to the train. Taking CRH3 as the research object, the pressure pulse on windbreak impacting by different wind speed and different train speed were studied by simulation. In the simulation, the overset mesh method, which can simulate the real train movement, and the chamber energy dissipation windbreak, which retains the hole characteristics, are used. The results show that the pressure pulse around high?speed train presents “positive?negative?negative?positive” trend. The pressure pulses of two trains couple with each other and act on the windbreak on the side of the line. With the train speed increasing, the pressure extremum increases, the commutation time reduces and the rate of change increases. With the wind speed increasing, the cross?wind coupling with the train wind amplifies the negative pressure inside the windbreak. The positive pressure extremum is outside the length of the train and the negative pressure extremum is inside the length of the train. The position of the positive pressure extremum is nearest to the nose cone of the head train. The pressure extremum will move backward under cross?wind.

Key words: vehicle engineering, high?speed train, windbreak, pressure pulse from trains passing each other, overset mesh

CLC Number: 

  • U270

Fig.1

Computational domain"

Fig.2

Computational mesh"

Fig.3

Schematic diagram of overset mesh computational domain"

Fig.4

Schematic diagram of data exchange"

Fig.5

Comparison between model test and numerical calculation"

Fig.6

Pressure comparison between high?speed train passing each other and one train through"

Table 1

Computational cases"

编号 车速/(km?h-1) 风速/(m?s-1)
A 200,250,300,350,400 0,30
B 350 5,10,15,25,30

Fig.7

Pressure cloud of train passing each other and windbreak"

Fig.8

Streamlines of train passing each other and windbreak"

Fig. 9

Velocity vector diagram"

Fig. 10

Pressure cloud on windbreak"

Fig. 11

Schematic diagram of onitoring points location"

Fig. 12

Pressure?time curve of P16 with different train speeds(inside windbreak)"

Fig. 13

Pressure?time curve of P5 with different train speeds(outside windbreak)"

Fig. 14

Pressure?time curve of P5 and P16 with different wind speeds(inside and outside windbreak)"

Fig.15

"

Fig.16

Relative positional relationship between pressure peak and train"

Table 3

Coordinates of pressure peak and train m"

无横风 有横风
车头鼻锥 -10.5 -10.5
头车波峰 -10.2 -10.5
头车波谷 -17.5 -18.3
车尾鼻锥 -87 -87
尾车波谷 -82.5 -83.9
尾车波峰 -89.9 -89.8
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