Determination of an acoustic reflection coefficient at the inlet of a model gas turbine combustor for power generation

5th Global Conference on Materials Science and Engineering

Song, W.J.^1 ; Cha, D.J.^2

Department of Mechanical Systems Engineering for Energy Convergence, Dongshin University, Naju

58245, Korea, Republic of^1

Department of Building and Plant Engineering, Hanbat National University, Daejeon

34158, Korea, Republic of^2

关键词: Acoustic oscillation;    Acoustic reflection;    Dynamic pressure signals;    Gas turbine combustor;    Partially-premixed;    Power generation systems;    Two-microphone methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/164/1/012010/pdf
DOI  :  10.1088/1757-899X/164/1/012010

来源: IOP

【 摘 要 】

A phenomenon that potentially influences the reliability of power generation systems is the presence of thermo-acoustic oscillations in the combustion chamber of a land- based gas turbine. To develop specific measures that prevent the instability, it is essential to predict and/or evaluate the underlying physics of the thermo-acoustics, which requires the acoustic boundary condition at the exit of the burner, that is, at the inlet of the combustor. Here we report a procedure for calculating acoustic reflection coefficients at the burner exit by utilizing two microphone method (TMM) for dynamic pressure signals. The procedure has been verified by comparing its results with reported ones and further successfully employed to determine the acoustic boundary condition of the burner of a partially-premixed model gas turbine combustor.