小型ガスタービンエンジン用燃焼器の振動低減を目的とした吸音ライナの設計・開発

抄録

Hydrogen is being considered as a solution to decarbonize aviation propulsion systems. However, the faster combustion rate of hydrogen-based gas turbine combustors compared to existing jet-fueled gas turbine combustors may result in higher combustion vibrations. Therefore, it is important to take measures against vibration and acoustics, such as ensuring that the natural frequencies of vibration and acoustics are not matched. In this study, an acoustic finite element (FEM) analysis model simulating a combustor element test rig designed to enable a small gas turbine engine to be fired by hydrogen is first presented. The dominant acoustic modes are identified from the analysis results. Finally, for noise reduction in the combustor, a sound absorbing liner is designed based on the theoretical equation and the reduction effect of the sound absorbing liner is described by acoustic FEM analysis.