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Etude du refroidissement et du positionnement d'équipements ferroviaires embarqués en toiture

Abstract : Next generation railway vehicles will offer more room for passengers together with increased comfort specifications. In order to fulfill these new requirements, equipments are now gathered on train roof. Elements releasing large heat quantities are then adjacent to others needing fresh air, in a close space possibly subject to strong flow disturbances. This may imply a decrease of the general performances of the vehicle, whose design is therefore to be reconsidered. The first phase of the study is dedicated to the steady and unsteady flow aspects, first at the train scale and then at the equipments scale. The latter are considered under operation in numerical and experimental simulations. Based on various kinds of vehicles, the models used are representative of the present and future trends in railway design. Online tests finally confirm the numerical results obtained, through temperature measurements and flow visualizations. A new, simplified, numerical model applying to the equipments is thus defined on the basis of a three-dimensional cavity. A parametric study highlights different, significant, flow structures with the variation of several characteristic geometrical dimensions. Their influence on the local thermal exchanges is shown, especially when the average heat transfer coefficient on the braking resistor surface is concerned. A design methodology is finally suggested. Combining ease of use and efficiency, it is applicable as of the preliminary draft and leads to significant improvements in the heat exchanges by the modification of the position and dimensions of the equipments. This methodology can use pre-computed configurations, in order to achieve a faster result.
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Contributor : Charles-André Lemarie <>
Submitted on : Friday, January 7, 2005 - 4:24:56 PM
Last modification on : Friday, November 13, 2020 - 8:44:12 AM
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  • HAL Id : tel-00007959, version 1



Charles-André Lemarie. Etude du refroidissement et du positionnement d'équipements ferroviaires embarqués en toiture. Energie électrique. Université de Valenciennes et du Hainaut-Cambresis, 2004. Français. ⟨tel-00007959⟩



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