Numerical investigation of influence of pantograph parameters and train length on aerodynamic drag of high-speed train

Sun, Zhikun; Wang, Tiantian; Wu, Fan

doi:10.1007/s11771-020-4370-6

Cited by 27 publications

(6 citation statements)

References 38 publications

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“…Dai et al [14] analyzed the aerodynamic performance of a double-carbon strip pantograph and found that the presence of the front carbon strip affects the lift of the rear strip while reducing its resistance. Sun et al [15] investigated the influence of different train lengths on the aerodynamic resistance of high-speed trains. The results indicated that as the pantograph position moves towards the tail car, the aerodynamic resistance on the pantograph decreases.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Analysis and Optimization of Pantograph Streamline Fairing for High-Speed Trains

Kan,

Li,

et al. 2024

FDMP

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A pantograph serves as a vital device for the collection of electricity in trains. However, its aerodynamic resistance can limit the train's running speed. As installing fairings around the pantograph is known to effectively reduce the resistance, in this study, different fairing lengths are considered and the related aerodynamic performances of pantograph are assessed. In particular, this is accomplished through numerical simulations based on the k-ω Shear Stress Transport (SST) two-equation turbulence model. The results indicate that the fairing diminishes the direct impact of high-speed airflow on the pantograph, thereby reducing its aerodynamic resistance. However, it also induces interferences in the flow field around the train, leading to variations in the aerodynamic resistance and lift of train components. It is shown that a maximum reduction of 56.52% in pantograph aerodynamic resistance and a peak decrease of 3.38% in total train aerodynamic resistance can be achieved.

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Section: Introductionmentioning

confidence: 99%

Aerodynamic Analysis and Optimization of Pantograph Streamline Fairing for High-Speed Trains

Kan,

Li,

et al. 2024

FDMP

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“…The continuous rise in HST operational speed has caused concerns about the train's aerodynamic performance, especially the aerodynamic drag related to energy consumption. The aerodynamic drag is the resistance force felt by the train as it moves in open air Zhou et al 2021;Sun et al 2020;Tan et al 2022), and increases as the train speed increases (Baker 2014;Tian 2007). Thus, for researchers, optimizing the train shape to achieve drag reduction has become a crucial issue.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Influence of Windshield Configuration and Train Length on High-Speed Train Aerodynamic Performance

Adamu

Zhang²,

Gidado³

et al. 2023

JAFM

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The aerodynamic performance of four train models with different windshield configurations (i.e., internal and/or external) in three train marshalling modes (i.e., 3, 6 and 8-car groups) was numerically investigated in this study. The train's airflow characteristics at Re=2.25×106 were determined using the shear stress transport (SST) k- turbulence model. The results were validated by comparing the pressure distributions and drag forces on the streamlined heads with experimental data. The difference in windshield configuration and train length has a substantial influence on the train’s flow field and surface pressure distribution. For the trains with internal windshields, due to non-uniform geometry, the flow is separated and vortices are formed at the windshield area. The boundary layer profile increases with the increased train length, and its thickness varies with windshield configurations. Asymmetric vortices are formed in the wake at a distance close to the tail car’s nose, except for trains with external windshields. The reduction of the flow velocity as the train length increases causes a reduction of the low pressure near the tail car’s streamline transition, thus causing a decrease in the tail car’s drag and lift forces. Consequently, for trains with external windshields, the head car’s drag increases, whereas the total train drag reduces significantly as the train length increases. Therefore, employing external windshields in all the inter-carriage gap sections, irrespective of the train length, demonstrates a good ability to reduce future train’s aerodynamic drag.

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“…Some scholars also studied the current collection characteristics of carbon strip on the pantograph based on the structure of the pantograph. Liu 20 found when studying the rolling bow head that when the relative movement between the pantograph and the net occurs, the temperature of the carbon strip of the rolling bow head is also weaker than that of the traditional bow head, and when the pantograph and the net system receives the dynamic current, the temperature of the carbon strip of the rolling bow head decreases with the increase of the relative operating speed of the pantograph and the net system, while the temperature of the carbon strip of the traditional bow head increases with the increase of the relative operating speed of the pantograph and the net system; Yao, 21 in order to study the influence of the pantograph slot on the carbon strip, compared the two pantographs with a cavity and the pantographs without a cavity and found that having a closed cavity structure helps to reduce the noise of the pantograph and reduce the wear; Wang 22 explored the length of the train and found that with the increase of vehicles without pantograph, the more serious the complex turbulent zone formed by the carbon strip. From the aspects of air flow and wind direction, Tan, 23 when studying the work of the pantograph, the cylindrical rod perpendicular to the air flow direction has more obvious disturbance effect on the air flow, resulting in a larger range of vortex shedding; Wei 24 studied the arc erosion by studying the lateral wind and found that higher crosswind speed will lead to higher arc voltage, while higher input current corresponds to lower arc voltage, and more accumulated joule heat can significantly reduce the arc resistance.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on the non-uniform wear of the carbon strip of the metro pantograph

Luo,

Cai,

Yang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The present study simulated the actual contact conditions between the catenary and pantograph of a metro line using high-speed ring block current that carried friction and wear testers, from which the uneven wear of the pantograph carbon strip under different working conditions was studied. The results show that the arc power, friction coefficient, and wear amount will change correspondingly with increasing current and normal load. Additionally, all carbon strips showed non-uniform wear after the test, and the edge erosion and wear depth of the carbon strip perpendicular to the moving direction were higher than those in the middle part. The ablation of the back end of the carbon strip running with the catenary was higher than that of the front end.

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Numerical investigation of influence of pantograph parameters and train length on aerodynamic drag of high-speed train

Cited by 27 publications

References 38 publications

Aerodynamic Analysis and Optimization of Pantograph Streamline Fairing for High-Speed Trains

Aerodynamic Analysis and Optimization of Pantograph Streamline Fairing for High-Speed Trains

An Investigation of Influence of Windshield Configuration and Train Length on High-Speed Train Aerodynamic Performance

Experimental research on the non-uniform wear of the carbon strip of the metro pantograph

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