Transfert instationnaire de chaleur en échangeur récupérateur de moteur de fusée : simulation expérimentale en échangeur bitube

Abstract : The present thesis is concerned by experimental study of gas-gas bitubular heat exchangers, submitted to transient conditions, for counter current and cocurrent configurations. The transient imposes conditions are respective to entrance temperature or mass flux from one of the system fluids. After a synthesis of the state of the art, a study of a bitubular heat exchanger is developed, with two different modelling approachs. The first one considers the heat exchanger system as a whole (lumped system analysis) : only entrance and exit state are concerned. In the second approach, the heat exchanger is modelled on a local point of view : the various local 1D sections are taken into account ; the transient heat exchanger response to the solicitation is reported relative to temperatures evolution, and also heat fluxes exchanged. The various exposed models allow to consider fluid temperatures, but also internal and external walls temperatures. It is shown that the temperature response of the system is obtained with a first order exponential model for the walls and the non perturbed fluid ; a two exponent model is necessary for the temperature of the perturbed fluid.So we observe that a specific time constant exist for each subsystem inside the HEX ; the biexponential model allows us to take account of the non ideality of the perturbation, and implies to introduce a transition parameter in place of time lag. This last notion currently used for liquid-liquid HEX has not been caracterized until now. The time lag does not appear in the models concerning perturbed fluid, and internal wall ; however this time lag is necessary to describe adequately the internal wall.
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Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_2007_0010_JACQUOT.pdf
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https://hal.univ-lorraine.fr/tel-01748664
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Submitted on : Thursday, March 29, 2018 - 11:44:23 AM
Last modification on : Friday, March 30, 2018 - 1:28:12 AM

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Cédric Jacquot. Transfert instationnaire de chaleur en échangeur récupérateur de moteur de fusée : simulation expérimentale en échangeur bitube. Autre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10010⟩. ⟨tel-01748664⟩

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