講演2 乱流火炎構造と燃焼制御(ガスタービン燃焼関連分野における最近の研究〜不安定な燃焼を安定させるには?,先端技術フォーラム)

概要

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To develop the theoretical strategy for controls of turbulent combustion, sound generation mechanism in turbulent reactive flows has been investigated from direct numerical simulation (DNS). The turbulent combustion controls based on local flame structure were demonstrated on the swirl-stabilized combustor. The controls of a combustor were conducted by adding secondary fuel injection. The combustion noise can be reduced about 1OdB by adding continuous 1% secondary fuel injection and about 5dB more by controlling frequency of a secondary fuel injection. The relation between local flame structure and pressure fluctuation was discussed by using the simultaneous measurement of CH-OH PLIF and pressure. The combustion-induced oscillation is well correlated with the beat frequency observed in pressure, and the global characteristics of flame fronts are also correlated with the beat frequency. By adding this beat frequency to the secondary fuel injection, the maximum noise reduction can be achieved. The mechanism of noise reduction by a secondary fuel injection was also clarified by combined laser diagnostics and DNS.
2011-07-06