Experimental and Numerical Investigations on Ignition and LBO Performances for Staged Combustor under Sub-Atmospheric Conditions  

作　　者：ZHAO Qianpeng XU Gang MU Yong YANG Jinhu WANG Kaixing 

机构地区：[1]Laboratory of Light-Duty Gas-Turbine,Institute of Engineering Thermophysics,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Innovation Academy for Light-duty Gas Turbine

出　　处：《Journal of Thermal Science》2023年第3期1251-1262,共12页热科学学报（英文版）

基　　金：supported by National Science and Technology Major Project with Project No.2017-Ⅲ-0007-0032。

摘　　要：In order to effectively widen the high-altitude operating limits of the multi-swirl staged combustor,the ignition and lean blow-out(LBO)performances of the model combustor were experimentally acquired under the conditions of room temperature and sub-atmospheric pressure with the altitude ranging from 0 km to 12 km.Moreover,the isothermal flow fields inside a staged model combustor with different sub-atmospheric conditions were simulated.Experimental results show that the minimum ignition and LBO fuel-air ratio(FAR)increase rapidly with the increase of simulated altitude.In addition,as the relative pressure drop of injector increases from1%to 3%,the ignition and LBO performances are gradually improved.Side visualization of the flame by high-speed camera shows that the time-averaged flames under stable combustion have a similar distribution pattern under different pressure drops.The luminous intensity is stratified into dim-bright-dim layers along axial direction.The flame near LBO shrinks to the outlet of pilot stage with a great reduction in luminous intensity.The numerical results reveal that with the decrease of air pressure,the air mass flow rate involved in atomization and combustion is significantly reduced,and the aerodynamic shear force of swirling air is weakened,which are adverse to atomization and fuel-air mixing for airblast atomizer and further lead to the deterioration of ignition and LBO performances.

关 键 词：IGNITION lean blow-out sub-atmospheric pressure staged combustor airblast atomizer 

分 类 号：V233.3[航空宇航科学与技术—航空宇航推进理论与工程]