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Title: Experimental Study of Fuel-Air Mixing and Dilution Jets on Outlet Temperature Distribution in a Small Gas Turbine Combustor
题目：油-气混合和掺混射流对小型燃气轮机燃烧室出口温度分布影响实验研究
Authors: CAI Wenzhe, WU Jing, HU Yingqi, YANG Zhiqiang, XUE Xin, LIN Yuzhen
作者: 蔡文哲，吴静，胡英琦，杨智强，薛鑫，林宇震
单位：北京航空航天大学航空发动机气动热力国家级重点实验室，北京动力机械研究所，北京航空航天大学能源与动力工程学院
Journal of Thermal Science, 2024, 33(5): 1883-1896.
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摘要
Abstract: Experimental analysis was conducted to study the impact of fuel-air mixing and dilution jet on the temperature distribution in a small gas turbine combustor using various optical diagnostic techniques. The strength and velocity of the swirler at the venturi exit were adjusted to modify the fuel-air mixture, which is presumed to dominate the heat release of the main combustion zone. Additionally, the dilution hole configuration, including the number and size of the holes, was varied to investigate the dilution effect on outlet temperature distribution. Various optical diagnostic techniques, such as particle image velocimetry, planar Mie scattering, and OH* chemiluminescence, were used to measure the flow field, fuel spray distribution, and flame structure, respectively. A reduction in swirling strength led to a decrease in the average flow rate in the throat, which improved the structure and symmetry of the axial vortex system in the sleeve, enhanced the mixing of fuel and gas in the dome swirling air, and ultimately, improved the temperature uniformity of the heat release zone. Compared to larger and sparse dilution jets, smaller and dense dilution jets tended to generate hot spots shifted towards the radial middle area.
摘要：本文采用多物理场光学诊断技术,通过实验研究了小型燃气轮机燃烧室中燃料空气混合和掺混射流对出口温度分布的影响。由于旋流流动决定了主燃区的燃烧释热，因此通过改变旋流器的结构，控制文丘里出口处的旋流器强度和速度来改变燃料空气混合物。同时，通过调整掺混孔的数量和大小来改变掺混射流的穿透深度和周向疏密程度来探索掺混对出口温度分布的影响。采用一系列多物理场的光学诊断技术，包括粒子图像测速、平面米氏散射和OH*化学发光，分别用于测量流场、燃料喷雾分布和火焰结构。结果表明降低旋流强度提高文氏管喉道的平均流速，改善了套筒内轴向旋流流动的结构和对称性，加强了头部旋流流动中燃料和空气的混合,从而提高了燃烧高温释热区的均匀性。在相同的空气流量比下，较大稀疏的掺混射流倾向于产生偏向壁面的热点,较小紧密的掺混射流倾向于产生偏向径向中间区域的热点。
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引用格式
CAI Wenzhe, WU Jing, HU Yingqi, YANG Zhiqiang, XUE Xin, LIN Yuzhen, Experimental Study of Fuel-Air Mixing and Dilution Jets on Outlet Temperature Distribution in a Small Gas Turbine Combustor, Journal of Thermal Science, 2024, 33(5): 1883-1896.
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