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Étude de l'aérodynamique interne des moteurs essence à cycle de Miller

Abstract : The Miller cycle is used to improve efficiency by prolonged expansion. This is achieved by reducing the effective compression ratio by closing the intake valves prematurely. The aerodynamic movement, internal to the cylinders, ceases to be maintained before the piston reaches bottom dead center. However, this movement is essential to the operation of an engine. It allows first of all to make a good mixture between the air and the gasoline and then to accelerate the combustion phase by generating turbulence.A first part of the thesis was devoted to the estimation of the benefits of using a Miller cycle. This study was conducted by modeling the cycle by a zero dimensional approach. A complete model, taking into account the internal aerodynamics and its effect on the combustion phase, has been realized. It allowed to show that the Miller cycle is more efficient than the Otto cycle.A second part was devoted to the assembly of a transparent engine test bench. It was equipped with a system of measurement of velocity fields by laser velocimetry (Dual-PIV) which can measure two velocity fields by engine cycle while preserving the number of important cycles which can be observed by the traditional systems. It also allows to have the temporal link between two instantaneous fields of the same cycle. The tests were then carried out in order to observe the effect of a temporal shift and an asymmetry of the intake valve lift on the flow.
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Submitted on : Thursday, March 31, 2022 - 1:18:08 PM
Last modification on : Saturday, April 2, 2022 - 3:34:27 AM

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  • HAL Id : tel-03626184, version 1

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Marcellin Perceau. Étude de l'aérodynamique interne des moteurs essence à cycle de Miller. Mécanique des fluides [physics.class-ph]. Sorbonne Université, 2022. Français. ⟨NNT : 2022SORUS030⟩. ⟨tel-03626184⟩

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