Experimental Study of Fuel-Air Mixing and Dilution Jets on Outlet Temperature Distribution in a Small Gas Turbine Combustor

  • CAI Wenzhe ,
  • WU Jing ,
  • HU Yingqi ,
  • YANG Zhiqiang ,
  • XUE Xin ,
  • LIN Yuzhen
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  • 1. National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Research Institute of Aero-Engine, Beihang University, Beijing 100191, China
    2. Beijing Institute of Power Machinery, Beijing 100074, China
    3. School of Energy and Power Engineering, Beihang University, Beijing 100191, China

网络出版日期: 2024-09-09

基金资助

The work was financially supported by the National Science and Technology Major Project (J2019-III-0014-0057) and the National Natural Science Foundation of China (92041001).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Experimental Study of Fuel-Air Mixing and Dilution Jets on Outlet Temperature Distribution in a Small Gas Turbine Combustor

  • CAI Wenzhe ,
  • WU Jing ,
  • HU Yingqi ,
  • YANG Zhiqiang ,
  • XUE Xin ,
  • LIN Yuzhen
Expand
  • 1. National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Research Institute of Aero-Engine, Beihang University, Beijing 100191, China
    2. Beijing Institute of Power Machinery, Beijing 100074, China
    3. School of Energy and Power Engineering, Beihang University, Beijing 100191, China

Online published: 2024-09-09

Supported by

The work was financially supported by the National Science and Technology Major Project (J2019-III-0014-0057) and the National Natural Science Foundation of China (92041001).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

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。

本文引用格式

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[J]. 热科学学报, 2024 , 33(5) : 1883 -1896 . DOI: 10.1007/s11630-024-1983-3

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.

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