Since the early days of gas turbine engines, combustion/flow instability inside the combustor has been an issue in many engines, but little has been understood as to how the dynamics of the system involved contribute to the instability. The primary objective of this work is to provide general experimental procedures and to validate methods for examining the dynamic behaviors of combustion systems, and to provide accurate measurements of the combustion dynamics for use as a foundation for further theoretical and numerical research. Knowledge of the fundamental dynamics of combustion systems is crucial in understanding and modeling the flame behavior and enabling the use of insights in design process and for creating robust active control of combustors. The measurement technique used for the current work is a laser-based, non-intrusive one that the flow fields are not affected by probing for measurements. In addition to the measurement techniques, also presented in this book are techniques to impose acoustic effects on the flow fields along with parameters to quantify the degree of mixing and thermo-acoustic instability.

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