共鳴器による燃焼振動の低減法に関する研究 : 第2報,音響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 the Helmholtz resonator on combustion oscillation stabilization have been investigated for gas turbine combustor, and mechanism of Helmholtz oscillation control has been discussed. Numerical model, based on compressible Euler equation including combustion chamber and resonator, is proposed in order to describe the behavior of acoustic wave excited by dynamic heat release of flame in combustor. Relaxations of acoustic oscillation amplitude corresponding to resonator parameters, such as throat diameter, 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, while throat diameter is tuning parameter of resonator. Resonator parameters must be optimized in terms of attenuation characteristics as well as resonant frequency.
2005-06-25