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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。
In order to explore the application of bio-fuel in gas turbine combustor, butanol was blended into aviation kerosene, and entropy-convection model was constructed according to the experimental results of the combustion chamber. The influence of different volume fraction on the pressure oscillation frequency in the combustion chamber was quantitatively analyzed. The experimental results show that with the increase of the volume fraction of butanol, the pressure oscillation frequency in the combustion chamber decreases gradually with the inlet pressure of 1.98 MPa, the temperature of 600 K and the ratio of oil to gas 0.03, but there is no obvious change in the amplitude. The result of entropy wave convection model is in good agreement with the experiment. The analysis shows that the change of convection time caused by the change of calorific value of different fuel components is the main reason for the change of pressure oscillation frequency in combustion chamber, which provides a reference for controlling the pressure oscillation in combustion chamber.