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Impact de la présence du gradient thermique sur la propagation d'onde dans les milieux guidés

Abstract : The engine's intake line resonances can be used to improve its volumetric efficiency and reduce the emissions of pollutants. In supercharged engines, the use of compact liquid-to-air coolers (WCAC) generates a strong thermal gradient in the intake line. To take the first step in the analysis of the impact of this thermal gradient on the intake line resonances, the input impedance of a narrow pipe of diameter 1.6 mm with a strong non-uniform thermal profile is considered. First, the input impedance is calculated theoretically and compared with numerical results using ACTRAN software. This analysis was also done in the presence of a low-Mach number laminar flow of 0.02 M. The numerical simulations provide a preliminary understanding of the significance of the resonances caused by non-uniform thermal profiles and the important parameters. Then, the input impedance of multiple non-uniform thermal profiles is measured using TMTC method. To do so, a brief analysis of the importance of calibration load selection is done on the narrow pipe. Using non-resonant loads, the test bench is calibrated and impedance measurements are done with different thermal profiles. Besides, the measurements are done with a mean flow of up to 0.03 M and its impact is discussed in the presence of a non-uniform thermal profile.
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Submitted on : Tuesday, May 26, 2020 - 11:21:39 PM
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  • HAL Id : tel-02628540, version 1

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Ashkan Zaker. Impact de la présence du gradient thermique sur la propagation d'onde dans les milieux guidés. Thermique [physics.class-ph]. Université Paul Sabatier - Toulouse III, 2019. Français. ⟨NNT : 2019TOU30197⟩. ⟨tel-02628540⟩

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