Experimental Study on Flow Structure of Non-Premixed Swirl Burner Flows Using PIV

Abstract

This paper focuses on investigating the characteristic modes and structures in non-premixed swirling methane/air flames. Using the Particle Image Velocimetry (PIV) technique, the experiment measured the velocity distributions of the swirling flame. Cold flow conditions have been included to provide a picture of the flow field and to demonstrate the modifications induced by combustion. The characteristic lengths, velocity vectors, streamlines, and velocity distributions are presented and discussed. The experiment shows that a large spatial separation at the exit between the central and swirling annular jets can expedite the formation of a recirculation zone. Complex flow structures are found in the recirculation zone. Moreover, the differences between cold swirling flow field and combustion swirling flow are analyzed at length. The data from this experiment is helpful for optimization of the non-premixed burner design, and can be established as benchmarks for the development and validation of combustion numerical simulations.

Recirculation zone characteristics research on a sudden expansion swirl burner for DPF regeneration

“…The length of center recirculation zone is one of important performance evaluation indexes for a swirl burner, which has great significant on fuel–air mixing and combustion stability . Proper length of recirculation zone can not only effectively promote energy, mass and momentum transfer of fuel and air in swirl burner, but also can ensure the proper convective heat transfer in the combustion chamber to improve the burner efficiency.…”

“…Ge et al . studied the velocity distribution of flame in non‐premixed swirl burner by the technology of particle image velocimetry (PIV), analyzed the velocity vector and streamline distribution of cold flow field, verified and improved the combustion model. It showed that the recirculation zone with complex flow field appeared in the central of burner outlet from the research result which is important to understand the geometry and characteristics of non‐premixed swirl combustion flame.…”

“…Gu et al [12] discussed the steady combustion measures of several common swirl burners briefly, and put forward some suggestions about structure optimization, which is helpful for performance research on steady flow field of swirl burner-type DPF and geometry improvement for steady flow and stable combustion. Ge et al [13] studied the velocity distribution of flame in non-premixed swirl burner by the technology of particle image velocimetry (PIV), analyzed the velocity vector and streamline distribution of cold flow field, verified and improved the combustion model. It showed that the recirculation zone with complex flow field appeared in the central of burner outlet from the research result which is important to understand the geometry and characteristics of non-premixed swirl combustion flame.…”