Understanding of the High-speed Flame Movement of Gas Turbine Combustion Instability using a Proper Orthogonal Decomposition Method

정규직교분해법을 이용한 가스터빈 연소불안정 고속 화염거동의 이해

This paper presents the methods and examples of proper orthogonal decomposition analysis for the understanding of high speed flame movements induced by combustion instabilities in a gas turbine. Phase resolved high-speed flame images were obtained from the combustion test of an industrial gas turbine at the rate of 2000 frame per second, and were utilized for the proper orthogonal decomposition. This analyzing method provided useful information regarding combustion instability characteristics bringing alleviation idea of the instabilities, such as principle modes of flame movement and their energy fractions which mean by which modes and how much the flame coherent structures are composed.