<p align="center">ABSTRACT</p><p>Swirling flames are important in practical industrial combustors. The dynamic characteristics of swirling flames form the complex velocity and temperature fields, which indicate combustion efficiency and influence pollutant emission. A reliable numerical simulation that can calculate the entire velocity and temperature fields is required to understand and investigate the underlying combustion mechanism. The governing equations of methane swirling combustion process are consisted of mass conservation equation, Navier-Stokes equation and energy equation, which are solved by SIMPLE algorithm based on finite volume method. The simulation is performed by using Realizable k-ε model and non-premixed model in conjunction with GRI Mech 3.0 mechanism. The characteristics of swirling combustion are analyzed on the bases of visualizations of temperature distribution, velocity distribution, and streamlines. In each cross-section with varying heights from the nozzle, the high velocity and high temperature areas show similar closed or semi-closed annular structure. In the central longitudinal section, the V-shaped high temperature and high velocity regions show the swirling structure of combustion flow field. The high temperature area does not coincide with the high velocity area but is located relatively downstream. The high velocity area is in the periphery of the high temperature area. Furthermore, the effects of swirl number and swirl blade position on methane combustion characteristics are discussed. The validity of the numerical simulation results is verified by the simultaneous laser measurement of three-dimensional temperature and velocity fields in swirling flame.</p>

Numerical Simulation and Flame Characteristics Analysis of Non-Premixed Swirling Combustion

Paper Proceedings: https://asmedigitalcollection.asme.org/HT/HT2021/volume/84874

ASME 2021 Heat Transfer Summer Conference (SHTC2021)

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