熱伝導率の異なる二材料を用いた定常法による燃焼器ライナ壁のフィルム冷却性能評価と壁形状最適化

抄録

Highly efficient cooling of combustor liner-wall is essential for high thermal efficiency as it requires high turbine inlet temperature, and film cooling is adopted there. In some cases, liner-wall has wavy shape to simultaneously attain high strength and light weight. In this study, film cooling effectiveness and heat transfer coefficient were measured from one run of experiment using two different thermal-conductivity materials as liner-wall by steady-state infrared thermography method. Two series of wavy liner-wall optimization were performed by using an orthogonal table in the design of experiments. The present results showed the wall-shape optimized for more geometric parameters with shorter wave length had higher film cooling performance in most of the cooling flow-rate range.