正丁醇/煤油混合物非预混燃烧压力振荡特性

Pressure oscillation characteristics of n-butanol / kerosene mixture in non-premixed combustor

为探索生物混合燃料在燃气轮机燃烧室内的应用,将丁醇掺混入航空煤油中,根据燃烧室的实验结果构建熵波对流模型,定量分析其不同体积分数对燃烧室内压力振荡频率的影响。实验结果表明:在燃烧室进口压力1.98 MPa、温度600 K和油气比0.03下,随着丁醇所占体积分数增大,燃烧室内压力振荡频率逐渐下降,而幅值变化无明显规律。熵波对流模型结果与实验吻合较好,通过分析表明,不同燃料组分热值变化引起的对流时间改变,是燃烧室压力振荡频率变化的主要原因,为控制燃烧室内压力振荡提供了参考。

To further develop the application of the biomass fuel in gas turbine combustor,the wave convection model was conducted based on the experimental results to quantitatively analyze the influence of n-butanol / kerosene mixing ratios on the pressure oscillation frequencies in a non-premixed combustor. The experimental results show that the pressure oscillation frequencies decrease with the increasing volume proportion of butanol under the experimental condition of com bustor inlet pressure 1. 98 MPa,inlet temperature of600 K and fuel / air ratio of 0. 03. However,the amplitudes have no significant changes with the increase of volume proportion of butanol. The results of wave convection model are in good agreement with the experiment data. The calculation results show that the variation of convective time caused by the variation of heat value of different fuel components is the main cause of the variation of pressure oscillation frequencies. It provides reference for the control of pressure oscillation in a non-premixed combustor.