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should also be noted that the type of flow field with lean flames is only marginally influenced by the flame compared to the case without reaction [40]-[42]. In other words, the existence of the flame in the flow domain, does not fundamentally change the flow patterns. Additional Vortex Generation: As mentioned before, swirl flow associated with vortex breakdown is one of the most effective ways to induce flow recirculation. Vortex breakdown can be defined as a change in the structure of a vortex initiated by variation of tangential to axial velocity ratio [43], [44]. It causes flow recirculation in the core region of the combustor which moves the combustion products upstream to better mix with the incoming air and fuel [33]. Vortex breakdown, its physics, stability, and its application in combustor design are reported in the papers by Keller et al. [45], Schobeiri [35] and Keller et al. [46], as well as its other characteristics in [47], [48]. Gupta et al. [49] thoroughly reviewed swirl flows, their characteristics, and their applications in flame stabilization in their book ‘Swirl Flows’. Lucca-Negro and O'Doherty [44] reviewed studies undertaken on vortex breakdown in the second half of 20th century. Anacleto et al. [50] performed an experimental investigation on swirl flow and flame structure in a lean premixed combustor. They investigated the effects of different parameters such as swirl number (as defined by Beer and Chigier [51]) on flame stability and pollutant emission in a model combustion chamber. Duwig et al. [52] numerically and experimentally studied flow dynamics and flame structure in a swirling partially premixed operation on a simplified model combustor. Galley et al. [53] performed a similar experimental study on a model combustion chamber. Wurm et al. [54], [55] investigated the impact of swirl flow on 35PDF Image | DEVELOPMENT OF AN ULTRA-HIGH EFFICIENCY GAS TURBINE ENGINE (UHEGT
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