Gust wind tunnel study on ballast pick-up by high-speed trains

Navarro-Medina, Fermín; Sanz-Andrés, Ángel; Pérez-Grande, Isabel

doi:10.1007/s00348-011-1201-4

Cited by 11 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it is very important to research the aerodynamics of DUT. The research methods for the aerodynamic characteristic of high-speed trains include mainly numerical simulations (Medina et al, 2012;Xia et al, 2020), as well as wind tunnel experiments. Considering the cost and computational time, the numerical simulations mainly focus on the study of simple train models (Hemida & Krajnovic, 2009;Li et al, 2019), and the train models used in the numerical simulations are almost all made up of three cars (Han & Yao, 2017).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the aerodynamic resistances of double-unit trains with different gap lengths

Dai

Maruyama

et al. 2021

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

Double-unit trains increase passenger capacity but also increase energy consumption. Therefore, research about the aerodynamic resistance of a double-unit train is of great importance to save energy. In this study, a commercial long-marshalling high-speed train and 8 kinds of double-unit trains are used to investigate the effect of the gap length on aerodynamic resistance. The results show that the aerodynamic resistance of the double-unit train is 8.5%-12.9% larger than that of the long-marshalling train. It is the tail car (CC1 car) of the first single-unit train and the head car (CC2 car) of the second single-unit train that lead to the difference in resistance. For the double-unit trains with different gap length, the resistance increases incrementally with the gap length, which is also mainly caused by the CC1 and CC2 cars. With increases to the gap length (starting from 0 mm), the resistance of the CC1 car increases with the cremental increases in the gap lengths. The resistance of the CC2 car also gradually increases when the gap lengths become larger. The resistance of the CC1 car with a gap length of 0 mm is slightly greater than that with 25 mm.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the aerodynamic resistances of double-unit trains with different gap lengths

Dai

Maruyama

et al. 2021

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…For improving the wind flow quality inside the test section, one of the configurations listed in table 1 can be selected (Navarro-Medina [2]). In this paper, the configuration C 4 has been selected as the best wind flow quality in the test section.…”

Section: Testing Proceduresmentioning

confidence: 99%

“…The theoretical and conceptual research that justifies the development of the gust wind tunnel can be found in SanzAndres and Navarro-Medina [1] . The description of the gust wind tunnel can be found in Navarro-Medina et al [2]. In the initial version of this gust wind tunnel, the gust frequency control had not an electronic feedback.…”

Section: Introductionmentioning

confidence: 99%

An experimental and theoretical study of unsteady flow (gust) effects on structures

Sreenadh

Sanz-Andrés

Franchini

et al. 2013

Computational Methods and Experimental Measurements XVI

Self Cite

View full text Add to dashboard Cite

The gust wind tunnel at IDR, Universidad Politécnica de Madrid (UPM), has been enhanced and the impact of the modification has been characterized. Several flow quality configurations have been tested. The problems in measuring gusty winds with Pitot tubes have been considered. Experimental results have been obtained and compared with theoretically calculated results (based on potential flow theory). A theoretical correction term has been proposed for unsteady flow measurements obtained with Pitot tubes. The effect of unsteady flow on structures and laying bodies on the ground has been also considered. A theoretical model has been proposed for a semi-circular cylinder and experimental tests have been performed to study the unsteady flow effects, which can help in clarifying the phenomenon.

show abstract

“…Examples of ballast projection incidents in different countries are reported in literature. 5–7 In some cases, the energy of the impact was able to produce damages to both rolling stocks and infrastructures, 8 although, fortunately, no injuries to people are recorded.…”

Section: Introductionmentioning

confidence: 99%

A new methodology for assessing the actual number of impacts due to the ballast-lifting phenomenon

Somaschini

Rocchi

Schito

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

The phenomenon of flying ballast is one of the most recent aerodynamic problems caused by the increase in train speed. This issue becomes extremely evident when the speed of the train is increased above 300 km/h. At such speed, the pressure and velocity fields of the flow generated by the train in the upper layer of the track could lift the ballast stones. Although it has been found that collisions begin to occur at speeds of 270 km/h or greater, there are no experimental evidence on the correlation between the speed and the actual number of impacts. In this work, an experimental methodology that is able to detect the number of impacts due to ballast lifting, by means of on-board microphones, is presented. It is shown how this method has been validated and then adopted to statistically analyse extensive experimental campaigns carried out with two types of trains and three different ballast conditions at speeds up to 360 km/h. Due to the copious statistical basis, the outcomes allowed to better correlate how the train speed affects the number of impacts that may occur during a run, to identify the regions of the train that are most subjected to the flying ballast and to both verify and quantify the effect of different ballast conditions.

show abstract

Gust wind tunnel study on ballast pick-up by high-speed trains

Cited by 11 publications

References 17 publications

Numerical investigation on the aerodynamic resistances of double-unit trains with different gap lengths

Numerical investigation on the aerodynamic resistances of double-unit trains with different gap lengths

An experimental and theoretical study of unsteady flow (gust) effects on structures

A new methodology for assessing the actual number of impacts due to the ballast-lifting phenomenon

Contact Info

Product

Resources

About