直射式气动雾化喷嘴对燃烧室性能的影响

为了深入分析燃油喷嘴对燃气轮机燃烧室性能的影响，针对燃气轮机燃烧室中的直射式气动雾化喷嘴开展了数值模 拟，获得了气流流量、燃油流量和气液比对雾化性能的影响规律，喷嘴的雾化性能参数包括雾化粒径和雾化锥角。结果表明：气液 比和气流流量对该型喷嘴的雾化性能有显著影响，燃油流量对雾化性能的影响较小；气液两相间相对速度是影响该型喷嘴雾化性 能的决定因素，相对速度增大有利于减小雾化粒径，并增大雾化锥角；气流流量和气液比的增大均有利于雾化粒径的减小，燃油流 量的增加将使雾化粒径增大；增大气流流量、气液比和减小燃油流量均可使雾化锥角增大；该型喷嘴的雾化锥角变化范围为 30.12°～41.24°，雾化粒径变化范围为131.46～ 186.52 μm。喷嘴可实现在较小的雾化锥角变化范围内获得较宽的雾化粒径变化， 以此匹配燃气轮机燃烧室不同工作状态，具有较高的实用价值。

Influence of Plain-jet Air-blast Atomizer on Combustion Chamber Performance

In order to further analyze the influence of atomizer on gas turbine combustor performance, numerical investigations were conducted for the plain-jet air-blast atomizer in a gas turbine combustor. The spray performance including the Sauter mean diameter and spray cone angle were obtained to evaluate the spray performance with a variety of the mass flow rate of liquid and air and air-liquid ratio. The results show that the air-liquid ratio and air mass flow rate have a significant impact on the spray performance, while the influence of fuel flow rate is relatively small. The relative velocity between the air-liquid phases is a crucial factor in determining the spray perfor? mance. The increase in the relative velocity leads to a reduction in the Sauter mean diameter and an increase in the spray cone angle. The increase of the air mass flow rate and the air-liquid ratio are beneficial to obtain a smaller Sauter mean diameter, while the increase in fuel flow rate will increase the Sauter mean diameter; the increase in air mass flow and air-liquid ratio, and the decrease in fuel flow can in? crease the spray cone angle; The spray cone angle of the atomizer varies from 30.12°to 41.24°, and the Sauter mean diameter of the atomizer varies from 131.46 m to 186.52 m. The atomizer achieves a wide droplet size variation range within a small spray cone angle variation, so as to match different working conditions of the gas turbine combustor, which is highly practical.