Тип публикации: статья из журнала
Год издания: 2021
Идентификатор DOI: 10.1016/j.ijthermalsci.2020.106715
Ключевые слова: aerodynamics, four-vortex furnace, laboratory experiment, numerical modeling, piv, swirl flow structure
Аннотация: In this work, the swirling flow structure was studied experimentally and numerically in a wide range of operating parameters at a laboratory model of the promising furnace of pulverized-coal boiler with a four-vortex combustion circuit. The basic aerodynamic features of construction, affecting the efficiency of fuel combustion, werПоказать полностьюe investigated by the example of air under the atmospheric pressure (Re ~ 104) for the isothermal case. The data on distribution of averaged and pulsation velocity characteristics were experimentally obtained in various areas of the model using the non-contact PIV method (Particle Image Velocimetry). The results of measurements carried out in a wide range of initial velocities allow distinguishing three flow regimes (β is the ratio of flow velocities at the outlet of the side and frontal nozzles): the flow regime with regular structure (four symmetric vortices, β ≥ 1.8), the transitional regime (1.8>β > 0.9) and regimes with irregular vortex structure (β ≤ 0.9). It is shown that formation of irregular structures is associated with uneven organization of air supply to the model. In regimes with β
Журнал: International Journal of Thermal Sciences
Выпуск журнала: Vol. 161
Номера страниц: 106715
ISSN журнала: 12900729
Издатель: Elsevier Masson s.r.l.