共鳴器による燃焼振動の低減法に関わる研究 : 第1報,ヘルムホルツ振動抑制の数値解析(熱工学,内燃機関,動力など)

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The effects of resonator on combustion oscillation stabilization have been investigated for gas turbine combustor, and mechanism of Helmholtz oscillation control by resonator has been discussed. Numerical model describing Helmholtz oscillation behavior, excited between combustor and fuel injector, is presented. And relaxation of oscillation amplitude corresponding to resonator parameters, such as throat diameter and length, are calculated and compared by atmospheric combustion experiments. In case resonator is resonant to combustor, it is shown that oscillation amplitude can be minimized. However, effectiveness of resonator is lessened with decrease of throat diameter or increase of throat length, while throat diameter and length are both tuning parameters of resonator. Throat resistance, which is determined by both of throat diameter and length, is actually one of the major parameters in Helmholtz oscillation control. Resonator parameters must be optimized in terms of attenuation characteristics as well as resonant frequency.
2003-05-25