2123 希薄予混合燃焼器における燃料濃度分布と火炎温度分布計測に関する研究(J18-1 ガスタービンにおける熱流動問題(1),ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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In heavy-duty gas turbine engines, the turbine inlet temperature increases year by year to improve thermal efficiency. But, at the same time, this leads to the increase of NOx emissions. One of the most promising approaches for gaseous fuel(natural gas) to reduce NOx emissions is the adoption of lean premixed combustion. With lean premixed combustion, locally high temperature regions which are attributed to mixture inhomogeneity are suppressed, and so it has large effect in reducing NOx. However, in the case that it is applied to combustor, since fuel and air are separately supplied because of preventing flashback, it is needed to burn the mixture after sufficient mixing. In this study, we examined the air-fuel mixing characteristics in the unburned region where is adjacent to flame zone in Lean Premix Combustor with Swirling Flow. The mixing characteristics were evaluated by measuring the instantaneous concentration of mixed gaseous fuel which contains acetone as a tracer, using planar laser-induced fluorescence(P-LIF). Simultaneously, we measured the instantaneous flame temperature by Rayleigh scattering method, and investigated correlation between mixing characteristics in the unburned side and temperature distribution in the burned side.
社団法人日本機械学会の論文
2008-08-02