Affiliation:
1. Zhejiang University
2. Moscow Institute of Physics and Technology
Abstract
Abstract
Experimental and numerical simulation methods were employed to investigate the effect of gravity orientation on the dynamics of premixed conical flames. The study focused on a typical propane-air flame established on a Bunsen burner. Experiments and simulations were conducted under normal gravity (+ g), reverse gravity (-g), and transverse gravity (⊥g). In the initial phase of the research, the time-averaged shape of the flame under these gravity orientations was examined using flame chemiluminescence imaging. Particle Image Velocimetry (PIV) experiments and Direct Numerical Simulation (DNS) were performed to capture transient information, allowing for the visualization of the flame's flickering motion. The Dynamic Mode Decomposition (DMD) method was applied to analyze the velocity results, providing further insights into the mode and phase characteristics of flame dynamics. Additionally, the frequencies of flame flickering were determined through heat release signal experiments, revealing the relationship between gravity direction and flickering frequency. The study also validated a well-known empirical correlation for the + g case and attempted to adopt a formula for the ⊥g case.
Publisher
Research Square Platform LLC
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