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

  • ZHAO Qianpeng ,
  • XU Gang ,
  • MU Yong ,
  • YANG Jinhu ,
  • WANG Kaixing
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  • 1. Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Innovation Academy for Light-duty Gas Turbine, Beijing 100190, China

网络出版日期: 2023-11-22

基金资助

This work was supported by National Science and Technology Major Project with Project No. 2017-III-0007-0032.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

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

  • ZHAO Qianpeng ,
  • XU Gang ,
  • MU Yong ,
  • YANG Jinhu ,
  • WANG Kaixing
Expand
  • 1. Laboratory of Light-Duty Gas-Turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Innovation Academy for Light-duty Gas Turbine, Beijing 100190, China

Online published: 2023-11-22

Supported by

This work was supported by National Science and Technology Major Project with Project No. 2017-III-0007-0032.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

为有效拓宽多旋流分级燃烧室高空条件下的稳定工作边界,在常温和海拔0-12km的低压条件下实验研究了模型燃烧室的点火和贫油熄火性能,并采用数值模拟方法获得了不同低压条件下分级燃烧室的冷态流场。实验结果表明,随海拔高度的升高,最小点火油气比和贫油熄火油气比迅速增大;随着旋流器压降由1%升高至3%,点火和贫油熄火性能逐渐改善。高速相机记录的火焰演化过程表明,稳定燃烧状态下的时均火焰形态在不同压降下类似,火焰亮度沿轴向分为“暗-亮-暗”三层,临近熄火时火焰收缩至预燃级出口,并伴随火焰发光强度的大幅减弱。数值模拟结果表明,随着空气压力的降低,参与雾化和燃烧的空气质量流量大幅减少,旋流空气的气动力减弱,不利于空气雾化喷嘴的雾化和油气掺混,并最终导致点熄火性能的恶化。

本文引用格式

ZHAO Qianpeng , XU Gang , MU Yong , YANG Jinhu , WANG Kaixing . Experimental and Numerical Investigations on Ignition and LBO Performances for Staged Combustor under Sub-Atmospheric Conditions[J]. 热科学学报, 2023 , 32(3) : 1251 -1262 . DOI: 10.1007/s11630-023-1726-x

Abstract

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 from 1% 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.

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