Conjugate heat transfer study on a ventilated disc of high-speed trains during braking

Zhang, Luo; Zuo, Jianyong

doi:10.1007/s12206-014-0336-7

Cited by 21 publications

(8 citation statements)

References 10 publications

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“…In accordance with the presented results, other studies also confirmed maximum temperature location at mid-surface of disc [24,34]. On the other hand, this finding is contrary to previous studies who reported maximum temperature at outer radius of disc [23]; meanwhile, others reported extreme radius (inner and outer) as location of maximum temperature [22,35]. These variations in conclusion seem emerge from using different pad types (cover angle, size, groove number and layout), disc types and design.…”

Section: Friction Heating Boundary Value Problemsupporting

confidence: 88%

“…where heat partition coefficient [22], mean effective radius [13] and full disc friction surface area [23] are expressed according to Eqs. 7, 8 and 9, respectively.…”

Section: Heat Input and Boundary Condition Calculationsmentioning

confidence: 99%

“…In addition, other boundary conditions, including heat conduction and convection, are also highlighted (Eq. [21][22][23][24]. It should be noted that disc surface is taken as reference (0) from where other disc thickness is measured negatively along axial direction.…”

Section: Friction Heating Boundary Value Problemmentioning

confidence: 99%

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Non-Axisymmetric Modelling of Moving Heat Source for Spatial and Temporal Investigation of Temperature in Railway Vehicles Disc Brake

Deressa

Ambie

2022

Urban Rail Transit

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Railway disc brake is vulnerable to surface damages including fade, wear, squeal, thermal cracks and fatigue being just few of them. To counteract these negative consequences, reliable thermal model that can accommodate space and time variables is essential. The aim of this study is to develop new non-axisymmetric moving heat source and compare its efficiency with pre-existing traditional models. Factors responsible for temperature spatial and temporal variation are identified first and then programmed in ANSYS APDL similar capability to a FORTRAN. Heat flux and convection coefficients are calculated by empirical equations and stored in parameters and arrays for later use, based on small time and pad angular increment. The modelling is to successfully solve the problems in traditional models by estimating surface temperature difference as high as 49 °C, within acceptable computation time. Besides, its consideration of radial distance reported variations from traditional models as high as 10% and 60% in moving heat source and axisymmetric, respectively. And, it is also verified with the literature within acceptable variation. Finally, it is suggested that the model can be applied in conducting pad geometry optimization, thermal stress and fatigue life of disc brake.

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Section: Friction Heating Boundary Value Problemsupporting

confidence: 88%

“…where heat partition coefficient [22], mean effective radius [13] and full disc friction surface area [23] are expressed according to Eqs. 7, 8 and 9, respectively.…”

Section: Heat Input and Boundary Condition Calculationsmentioning

confidence: 99%

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Non-Axisymmetric Modelling of Moving Heat Source for Spatial and Temporal Investigation of Temperature in Railway Vehicles Disc Brake

Deressa

Ambie

2022

Urban Rail Transit

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“…There is also radiant heat exchange between brake disc components. According to the theory of heat transfer, the convective heat transfer coefficient [20] and the heat radiation coefficient [15] are obtained: In other words, the convective heat transfer coefficient varies with space and time [21] .…”

Section: School Of Mechanical Electronic and Control Engineeringmentioning

confidence: 99%

Simulation Analysis and Verification of Temperature and Stress of Wheel-Mounted Brake Disc of a High-Speed Train

Wang

Dong

2020

Preprint

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During the braking process, a large amount of heat energy is generated at the friction surfaces between the brake disc and pads and rapidly dissipates into the disc volume. In this paper, a three-dimensional thermo-mechanical coupling model of high-speed wheel-mounted brake discs containing bolted joints and contact relationships is established. The direct coupling method is used to analyse the temperature and stress of the brake discs during an emergency braking event with an initial speed of 300 km/h. A full-scale bench test is also conducted to monitor the temperatures of the friction ring and bolted joints. The simulation result shows that the surface temperature of the friction ring reaches its peak value of 413.7°C after 102 s of braking, which agrees well with the bench test result. The maximum alternating thermal stress occurs in the bolt hole where the maximum circumferential compressive stress is -658 MPa and the maximum circumferential tensile stress is 134 MPa. During the braking process, the out-of-plane deformation of the middle part of the friction ring is larger than that of the edge, which increases the axial tensile load of the connecting bolt. This work provides support for the design of brake discs and connecting bolts.

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“…For example, the convection heat transfer coefficient [22] as well as the weight of convection and radiation heat transfer over the total of heat flux [23] can be calculated from numerical simulation method. In heat transfer studies related to high-speed trains, Luo et al [24] and Ji et al [25] obtained the contribution of convection heat flux and radiation heat flux of on-board heating units through numerical methods and proposed optimization designs. Up to date, the studies regarding cooling performance of on-board heating units on the trains are usually conducted under standard atmosphere pressure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Vacuum Level on Heat Transfer Characteristics of Maglev Levitation Electromagnet Module

et al. 2020

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The vacuum tube transportation (VTT) system has been a promising direction of future transportation. Within this system, a high-speed maglev travels in a low-vacuum environment to reduce aerodynamic drag. However, the heat dissipation of on-board heating devices will be compromised under low-vacuum conditions, and the device performance may thus be lowered. This study investigates the low-vacuum conjugate heat transfer characteristic of a levitation electromagnet module of a maglev using an experimentally verified numerical method. During the heating process, the surface temperature distribution of the levitation electromagnet, and the temperature and velocity characteristics of the flow field are examined. It is found that, as the vacuum level increases from 1.0 atm to 0.1 atm, the total heat dissipating from the levitation electromagnet module is decreased by 49% at 60 min, the contribution of convection heat flux over the total heat flux is decreased from 49% to 17%, and the convection heat transfer coefficient of the levitation electromagnet is decreased by 89%. This study can provide an efficient numerical model for low-vacuum heat transfer study on a VTT system as well as help the evaluation and optimization of low-vacuum maglev thermal management systems.

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Conjugate heat transfer study on a ventilated disc of high-speed trains during braking

Cited by 21 publications

References 10 publications

Non-Axisymmetric Modelling of Moving Heat Source for Spatial and Temporal Investigation of Temperature in Railway Vehicles Disc Brake

Non-Axisymmetric Modelling of Moving Heat Source for Spatial and Temporal Investigation of Temperature in Railway Vehicles Disc Brake

Simulation Analysis and Verification of Temperature and Stress of Wheel-Mounted Brake Disc of a High-Speed Train

Influence of Vacuum Level on Heat Transfer Characteristics of Maglev Levitation Electromagnet Module

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