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Étude expérimentale des échanges convectifs sur le rotor d'une machine discoïde : influence d'un jet impactant

Abstract : The need for producing more electric power at a less cost involves the need for better producing, at a higher efficiency. This report poses multiple problems as far as the cooling of electrical machines is concerned, particularly those used within the wind turbines. The ignorance of the phenomena which occur there and the search of cooling improvement justified this study. Work consists of the experimental determination of the convective heat transfer on the surface of a rotating disk, when the steady-state regime is reached: single rotating disk and rotor-stator system with and without impinging jet. An experimental apparatus was developed to locally measure the dissipated energy over the rotating disk surface by using a technique of “thick layer” and infrared thermography. When the disk is rotating, an air flow is created and so a convective heat transfer. The apparatus was validated in a single disk configuration, which is very detailed in literature. The both rotor-stator configurations (with and without jet) let to highlight the influence of the different parameters on the system cooling. As far as the flow structure is concerned, literature data and visualization using a laser technique make possible the analysis of phenomena inside the air gap. Local and mean heat transfer are then correlated.
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Submitted on : Thursday, November 12, 2020 - 3:39:13 PM
Last modification on : Tuesday, November 23, 2021 - 9:44:52 AM
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  • HAL Id : tel-03001906, version 1


Julien Pellé. Étude expérimentale des échanges convectifs sur le rotor d'une machine discoïde : influence d'un jet impactant. Génie mécanique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, UVHC, (France), 2006. Français. ⟨NNT : 2006VALE0030⟩. ⟨tel-03001906⟩



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