XIAO Junfeng, WANG Wei, WANG Feng, et al. Numerical study on premixed combustion stability in gas turbine combustor[J]. Thermal power generation, 2018, 47(8): 61-65.
XIAO Junfeng, WANG Wei, WANG Feng, et al. Numerical study on premixed combustion stability in gas turbine combustor[J]. Thermal power generation, 2018, 47(8): 61-65. DOI: 10.19666/j.rlfd.201802064.
燃气轮机燃烧室预混燃烧稳定性数值研究
摘要
为充分理解燃气轮机燃烧不稳定特性
以某型燃气轮机旋流燃烧室为模型
对其预混燃烧过程进行了数值研究。结果表明:燃料/空气当量比会影响燃烧不稳定形成过程及其压力振荡特性
燃料/空气当量比越大
触发燃烧不稳定的时间越短
燃烧室内压力脉动主频越高
压力脉动主频振幅越大;距燃烧室喷嘴越近
燃烧室压力脉动振幅越大;涡旋脉动导致的火焰面面积变化极可能是引起燃烧室压力高频脉动的主要原因。
Abstract
In order to fully understand the combustion instability of gas turbine
numerical study on premixed combustion process is conducted using a gas turbine swirling combustor as a model. The results show that the fuel/air equivalence ratio can affect the formation process of combustion instability and its pressure oscillation characteristics. With an increase in the fuel/air equivalence ratio
the time for triggering combustion instability decreases
the basic frequency of the pressure oscillation in combustor increases
and the basic frequency amplitude of the pressure oscillation increases. Besides
the closer to the combustor nozzle
the greater the amplitude of the pressure oscillation in combustor. The high-frequency pressure oscillation in combustor is probably due to the change of the area of the flame surface caused by the vortex oscillation.