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

作　　者：CAI Wenzhe WU Jing HU Yingqi YANG Zhiqiang XUE Xin LIN Yuzhen 

机构地区：[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

出　　处：《Journal of Thermal Science》2024年第5期1883-1896,共14页热科学学报（英文版）

基　　金：financially supported by the National Science and Technology Major Project(J2019-Ⅲ-0014-0057);the National Natural Science Foundation of China(92041001)。

摘　　要：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.

关 键 词：small gas turbine combustor fuel-air mixing outlet temperature distribution dilution jet laser diagnostics 

分 类 号：TK471[动力工程及工程热物理—动力机械及工程]