Running Safety of High-Speed Train Equipped with Aerodynamic Brake under Cross Wind

Tian, Chen; Wang, Meng; Zhu, Yang; Chen, Meng Ting

doi:10.4028/www.scientific.net/amr.614-615.348

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…Many literatures concentrated on the parameters of installation position and number, shape, different opening angles, braking plate height, axial and lateral spacing, and got the variation rule of braking force and proposed the corresponding design scheme [6][7][8]. Besides, some literatures studied the performance of aerodynamic braking under special circumstances, such as crosswind environment [9], bird impact [10] and aerodynamic noise [11]. Lots of research results demonstrated that aerodynamic braking was an effective and reliable emergency-braking technology in highspeed trains, and its implementation had also been achieved [12,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and optimization on opening angles of aerodynamic braking plates sets for a maglev train

et al. 2023

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The aerodynamic braking has become an attractive option with the continuous improvement of train speeds. The study aims to obtain the optimal opening angles of multiple sets of braking plates for the maglev train. Therefore, a multi-objective optimization method is adopted to decrease the series interference effect between multiple sets of plates. And the computational fluid dynamics method, based on the 3-D, RANS method and SST k-ω turbulence model, is employed to get the initial and iterative data. Firstly, the aerodynamic drag and lift are analysed, as well as the pressure and velocity distribution of the flow field with the braking plates open at 75°. Then, the aerodynamic forces of each braking plate pre and post optimization are compared. Finally, the correlation between each set of braking plates and the optimized objective is analysed. It is found from the results that the aerodynamic drag and lift of the train have significant differences with or without multiple sets of braking plates. Additionally, the design variable corresponding to the number of iterations of 89 is taken as the relative optimal solution, and its opening angles of braking plates (B2-B5) are 87.41°, 87.85°, 87.41°, and 89.88°, respectively. The results are expected to provide a reference for the opening angles design scheme for the future engineering application of high-speed maglev train braking technology.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation and optimization on opening angles of aerodynamic braking plates sets for a maglev train

et al. 2023

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“…Niu et al [9,10] studied the mutual influence of braking plates, and believed that the installment position of braking plates was very important. Tian et al [11] used a simplified train model to study the effect of braking plates on the derailment coefficient. Zhai et al [12] mainly studied the flow field structure near the braking plate with and without crosswind but paid little attention to the aerodynamic characteristics of trains.…”

Section: Introductionmentioning

confidence: 99%

Effect of Braking Plates on the Aerodynamic Behaviors of a High-Speed Train Subjected to Crosswinds

Tian

Zhang

2021

Energies

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Using aerodynamic resistance to provide braking force for trains is an economical braking method. It has few components to wear out and requires no energy. But the aerodynamic braking plate will significantly affect train’s aerodynamics behaviors. This paper studies the effect of the braking plates’ layout on the aerodynamic force of head car when a train is running under a crosswind. The results show that the braking plate will not only increase the drag force, but also significantly affect the lift and lateral force of the train’s head car. The installation position of the braking plates will also have a great effect on the aerodynamic force. In order to increase the drag force and weaken other aerodynamic force changes of the head car, we suggest that the first braking plate be arranged at the end of a streamlined shape, and the second braking plate be arranged at the middle of the car body. Compared with trains without braking plates, the head car’s drag force increases by 85.7%, lift force only increases by 7.6%, and side force decreases by 5.9%, when the braking plates are in operation.

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“…In China, Liang Xifeng from Central South University has analyzed the aerodynamic braking device by numerical simulation, which only illustrates that the brake wing at high speed can provide a relatively large auxiliary braking force. On that basis has the research group of Tongji University put forth some suggestions about the brake wing design and its distribution on the car and conducted the research of the air dynamics and safety of the high-speed train with aerodynamic braking device [4][5][6][7], furthermore made the aerodynamic braking device an engineering approach, and verified the numerical simulation analysis by testing the force in the wind tunnel of a relatively low speed (250 km/h). However, the aerodynamic braking device still needs other performance testing in a continuous running test-bed with a high speed of 550 km/h and big testing section size.…”

Section: Introductionmentioning

confidence: 99%

Design of the Wind Channel for the Test-Bed of Aerodynamic Brake

Cheng

Tian

Wang

et al. 2013

AMM

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For simulating the wind load strength effect so as to detect the opening and closing performance of the aerodynamic braking device and the reliability of its opening and closing mechanism with the wind load caused by high speed flow field, the wind load test-bed is to build. Wind channel, as the equipment to turn a high pressure flow into a relatively high speed advection, is one of its important components. This paper focuses on the design of the shape of the wind channel. By the means of flow field simulation analysis, with the indexes of the wind load size, the pressure distribution and the flow equality, the shape optimization of the wind channel is realized.

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Running Safety of High-Speed Train Equipped with Aerodynamic Brake under Cross Wind

Cited by 7 publications

References 4 publications

Numerical simulation and optimization on opening angles of aerodynamic braking plates sets for a maglev train

Numerical simulation and optimization on opening angles of aerodynamic braking plates sets for a maglev train

Effect of Braking Plates on the Aerodynamic Behaviors of a High-Speed Train Subjected to Crosswinds

Design of the Wind Channel for the Test-Bed of Aerodynamic Brake

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