Etude du régime d'écoulement du fluide dans le jeu d'un ensemble piston-cylindre en vue de l'optimisation du calcul du coefficient de déformation.

Abstract : The pressure balances are utilized in the metrology of the static pressure. TheEuropean project as "Euromet 463" has underlined the lack of agreement between experimentalmeasurements and calculations of the parameters necessary for the pressure balance. Thepiston fall rate is, in particular, an essential parameter in the calibration procedure. The aim ofthe thesis is the adjustment of methods for estimating the piston fall rate. This will improve thecharacterization of the gap, determine the effective area more precisely and consequentlyimprove the uncertainty on the pressure distortion coefficient, a key parameter for the calibrationby comparison. lndeed, the former quasi one-dimensional madel assimilates the gap betweenpiston and cylinder as formed by two parallel walls, which is an approximation. ln this study, theequations of the fluid flow are modified to evaluate the influence of the model in an annular gapmadel. ln addition, corrections due to the velocity of the piston wall are taken into account. Thisresearch work is applied on the piston-cylinder units 50, 200 and 1000 MPa of the Laboratoirenational de métrologie et d'essais (LNE). Taking into consideration the variability of parameterssuch as geometry or fluid properties, a comparison between the experiment and the calculationis carried out.
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Padipat Wongthep. Etude du régime d'écoulement du fluide dans le jeu d'un ensemble piston-cylindre en vue de l'optimisation du calcul du coefficient de déformation.. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0041⟩. ⟨pastel-00918486⟩

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