Thèse de Doctorat

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Browsing Thèse de Doctorat by Author "Abdelbasset LACHRAF"

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    Numerical Study of Turbulent Mixing with or without Chemical Reactions in Various Geometrical Configurations
    (2023) Abdelbasset LACHRAF
    In recent years, the pursuit of miniaturization has fueled the development of micro-combustion-based power generators. Among these, the Micro-Thermophotovoltaic (MTPV) system has emerged as a promising technology, converting radiant heat from micro-combustors into electricity using photovoltaic cells. Enhancing the performance of micro-combustors is crucial for achieving fuel efficiency, material optimization, and cost reduction. This doctoral research addresses the need for innovative solutions to enhance micro-combustor performance. It focuses on the numerical investigation of a novel microcombustor design featuring four pairs of equidistant angled ribs on the inner wall of the downstream channel. The study delves into the flow dynamics, combustion behavior, and thermal performance of this new configuration. The findings reveal significant improvements in wall temperature levels upon introducing the angled ribs. Moreover, increasing the rib heights enhances thermal performance considerably. The formation of recirculation zones around the ribs facilitates ignition, resulting in more stable and continuous flames. The proposed micro-combustor configuration demonstrates superior thermal characteristics, as evidenced by mean weighted average and non-uniformity index parameters. This research not only explores the potential of rib geometries for micro-combustor enhancement but also contributes to the development of more efficient and sustainable energy generation technologies. The study addresses existing research gaps, particularly in the context of ribs as wall projections, and emphasizes the importance of an integrative analysis approach encompassing flow dynamics, combustion, and thermal challenges. The research aims to bridge these gaps and advance the field of micro-combustion, offering valuable insights for future innovations in sustainable power generation.