모형 가스터빈 연소기의 기초 연소특성에 대한 실험적 연구

The mainly objectives of this study was a combustion dynamics and instability characteristics in a model gas turbine dump combustor which is the scale down of GE 7FA+e DLN 2.6 gas turbine combustor. Model gas turbine injector has 2-stage swirl vane and it’s reduced 1/3 size of the original one. The shape of plenum and combustor were designed for similar acoustic characteristics. Inlet air was preheated to 200 ~ 400 ℃. The flow velocity at mixing nozzle was 30 to 75 m/s and equivalent ratio was 0.4 to 1.2. The combustor length was varied for different acoustic characteristics to 375 ~ 700 mm. As the result, this research have been show the combustion instability was observed at lower equivalence ratios (Φ 1.1~1.2).