Flow Structure of Swirling Turbulent Propane Flames |
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Authors: | Sergey?V?Alekseenko Vladimir?M?Dulin Yuriy?S?Kozorezov Email author" target="_blank">Dmitriy?M?MarkovichEmail author Sergey?I?Shtork Mikhail?P?Tokarev |
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Institution: | (1) Dipartimento di Ingegneria Aerospaziale, Politecnico di Milano, Via La Masa, 34, Milano, 20158, Italy;(2) Dipartimento di Energetica, Politecnico di Milano, Via La Masa, 34, Milano, 20158, Italy |
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Abstract: | Flow structure of premixed propane–air swirling jet flames at various combustion regimes was studied experimentally by stereo
PIV, CH* chemiluminescence imaging, and pressure probe. For the non-swirling conditions, a nonlinear feedback mechanism of
the flame front interaction with ring-like vortices, developing in the jet shear layer, was found to play important role in
the stabilisation of the premixed lifted flame. For the studied swirl rates (S = 0.41, 0.7, and 1.0) the determined domain of stable combustion can be divided into three main groups of flame types: attached
flames, quasi-tubular flames, and lifted flames. These regimes were studied in details for the case of S = 1.0, and the difference in the flow structure of the vortex breakdown is described. For the quasi-tubular flames an increase
of flow precessing above the recirculation zone was observed when increased the stoichiometric coefficient from 0.7 to 1.4.
This precessing motion was supposed to be responsible for the observed increase of acoustic noise generation and could drive
the transition from the quasi-tubular to the lifted flame regime. |
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