Investigation of Bunsen-type Premixed Flame Response to Acoustic Excitation: Temperature and Flame Profile

We aimed to characterize a Bunsen-type premixed flame subjected to various acoustic excitations with a range of frequencies and amplitudes. Various acoustic fields were imposed on a Bunsen-type flame. Two key properties of the flame, flame profile and temperature, were examined and analyzed in the experiment. We observed that flame tilt angle, flame height, and flame temperature were strongly influenced by excitation frequencies and amplitudes. The results provide possible interpretations of experimental observations. In agreement with most combustion theories, there was a correlation between these flame properties and excitation amplitude and frequency. It has been shown that higher frequencies and amplitudes cause greater tilt angles and shorter flame heights, while in terms of flame temperature, higher acoustic amplitudes lead to greater combustion instabilities, resulting in lower flame temperature. Higher frequencies, on the other hand, lead to higher flame temperatures.