Abstract
In this paper, an experimental study of the non-reacting turbulent flow field characteristics of a piloted premixed Bunsen burner designed for operational at elevated pressure conditions is presented. The generated turbulent flow fields were experimentally investigated at atmospheric and elevated pressure by means of high-speed particle image velocimetry (PIV). The in-nozzle flow through the burner was computed using large-eddy simulation (LES), and the turbulent flow field predicted at the burner exit was compared against the experimental results. The findings show that the burner yields a reasonably homogeneous, nearly isotropic turbulence at the nozzle exit with highly reproducible boundary conditions that can be well predicted by numerical simulations. Similar levels of turbulence intensities and turbulent length scales were obtained at varied pressures and bulk velocities with turbulent Reynolds numbers up to 5300. This work demonstrates the burner’s potential for the study of premixed flames subject to intermediate and extreme turbulence at the elevated pressure conditions found in gas turbine combustors.Graphical abstract
Highlights
High-power combustion devices operate with highly turbulent flows of fuel and oxidizer to ensure proper mixing, and flames are subjected to extreme levels of turbulence
A new burner for the study of high-turbulence premixed flames at elevated pressures has been described and the generated turbulent flow fields have been characterized for nonreacting flows
To get an insight of turbulence generation in the burner and evaluate the predictability of the experimental data, the inner flow through the burner was computed using large-eddy simulation (LES) at atmospheric pressure, and the resulting mean flow field at the burner exit was compared with experimental results from high-speed particle image velocimetry (PIV) in terms of radial and axial profiles of the velocity components and their fluctuations
Summary
High-power combustion devices operate with highly turbulent flows of fuel and oxidizer to ensure proper mixing, and flames are subjected to extreme levels of turbulence. The effect of such turbulence on the structure and dynamics of the flames at practical conditions (i.e., high pressure and temperature) is not completely understood (Wabel et al 2019). The level of turbulence is typically characterized by the turbulent Reynolds number based on integral scales ( ReT ) and the Damköhler ( DaT,P ) and Karlovitz ( KaT,P ) numbers defined by Peters (2000): ReT = u Lx , (1) DaT,P =. Lean premixed combustion has gained applicability in modern combustor concepts such lean, premixed pre-vaporized (LPP) gas turbines (GT) as a way to reduce pollutant emissions and improve thermal efficiency and scalability of the burners (McDonell 2016).
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