【摘要】 为提高甲醇旋流燃烧器的燃烧效率，降低NO排放，通过数值模拟对甲醇旋流燃烧器的燃烧状态和NO排放进行了研究，并结合试验结果进行了对比和优化。通过激光粒度仪探究甲醇喷雾雾化效果和粒径分布特性，为数值模拟中甲醇液滴的离散相模型提供甲醇喷雾粒径参数，结果显示模拟喷雾粒径与试验高度吻合。重点分析了不同叶片角度下燃烧室内的速度分布、温度分布及NO质量浓度分布。研究结果表明：速度分布方面，随叶片角度增加，混合器的轴向速度受到抑制；叶片角度α=40°及α=60°时燃烧室内形成稳定回流区，显著改善甲醇与空气的混合效果。温度分布方面，小角度工况下高温区集中且温度较低，底部存在明显低温区；大角度工况下高温区范围扩大，温度显著提升，底部温度均匀性改善。燃烧效率随叶片角度增大而提高，但角度超过40°后提升效果减弱。燃烧室内及出口处NO生成质量浓度随叶片角度增大而升高。旋流器叶片角度对燃烧室内速度、温度、NO分布及燃烧效率均有显著影响，α=40°时在多方面表现较优。更多还原

【Abstract】 In order to improve the combustion efficiency of methanol swirl burners and reduce NO emissions,the combustion state and NO emissions of methanol swirl burners were investigated through numerical simulation. The results were compared and optimized with experimental data. A laser particle size analyzer was used to examine the atomization effect and droplet size distribution of methanol spray. This provided the spray size parameters for the discrete phase model of methanol droplets in the numerical simulation. The results show that the simulated spray size closely matches the experimental data. The study focuses on analyzing the effects of different blade angles on velocity distribution,temperature distribution,and NO mass concentration in the combustion chamber. The results indicate that as the blade angle increases,axial velocity of the gas mixture is suppressed. Stable recirculation zones are formed in the combustion chamber at blade angles of α = 40° andα = 60°,significantly improving the mixing of methanol and air. Regarding temperature distribution,under small blade angles,high-temperature zones are concentrated but relatively low in temperature,with noticeable low-temperature regions at the bottom. Under large blade angles,high-temperature zones expand,temperature increases significantly,and bottom temperature uniformity improves. Combustion efficiency improves as blade angle increases,but the improvement weakens when the angle exceeds 40°． NO generation concentration in the combustion chamber and at the outlet rises with increasing blade angles. The swirl vane angle significantly affects velocity,temperature,NO distribution,and combustion efficiency in the combustion chamber. The optimal performance is achieved at α = 40°.更多还原