The dataset contains several processed measurements of the thermoacoustic behaviour of several premixed laminar conical flames in a duct. A detailed description of how the data was collected is given in the file Readme.txt contained in the dataset. Further detail can be found in the paper: Adjoint-accelerated Bayesian inference applied to the thermoacoustic behaviour of a ducted conical flame, Yoko, M & Juniper, M.P., Journal of Fluid Mechanics.