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Non-adiabatic Modulation of Premixed-flame Thermoacoustic Frequencies in Slender Tubes by Flores-Montoya, Enrique; Muntean, Victor; Sánchez-Sanz, Mario; Martínez-Ruiz, Daniel is a scholarly article available to read on EtoBox.

What is Non-adiabatic Modulation of Premixed-flame Thermoacoustic Frequencies in Slender Tubes about?

This paper presents an experimental study of the influence of heat losses on the onset of thermoacoustic instabilities in methane-air premixed flames propagating in a horizontal tube of small diameter, $D = 10$ mm. Flames are ignited at the open end of the tube and propagate towards the closed end undergoing strong oscillations of different features due to the interaction with acoustic waves. Different regimes are reproduced in these experiments, namely the well-known primary and secondary thermoacoustic instabilities, which are strongly dependent on mixture equivalence ratio, fuel properties and geometric constraints of the combustion chamber. The frequency of oscillation and its axial location are controlled through the tube length $L$ and the intensity of heat losses. Main experimental observations show that classical one-dimensional predictions of the oscillation frequency do not accurately describe the phenomena under non-adiabatic real scenarios. Besides the experimental measurements, a quasi-one-dimensional heat transfer analysis of the burnt gases downstream of the flame is provided. This study introduced the effect of heat losses at the walls of the tube on the interplay b

Author

Flores-Montoya, Enrique; Muntean, Victor; Sánchez-Sanz, Mario; Martínez-Ruiz, Daniel

Published

2024

Language

EN