B-6 異なる酸素濃度場における旋回流希薄予混合火炎のレーザ画像計測(燃焼,一般講演)

概要

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In heavy-duty gas turbine engines, one of the promising approaches to reduce NOx emissions is the adoption of lean premixed combustion. In addition, exhaust gas recirculation (EGR) system in the gas turbine engine is considered. But, characteristics such as burning velocity and reaction zone of lean premixed flame are influenced by reducing oxygen concentration in the gaseous mixture. In this study, we measured lean premixed flame temperature and OH concentration distributions instantaneously using laser imaging techniques. And from the measurement results, we investigated the characteristics of lean premixed flame. As a result, it is appeared that the width of the flame zone is broadening as the oxygen concentration decreases. And OH-LIF intensity in the reaction zone is decreased with decrease of oxygen concentration. In addition, local extinction of the premixed flame was recognized in high air ratio and low oxygen concentration conditions.
2011-07-06