分级预混燃烧的稳定性

Stability of Staged Premixed Combustion

简要阐述了发生振荡燃烧的机理,并且用线性分析方法对某分级燃烧室在低负荷和满负荷两种工况下的流场,以及设计工况和非设计工况下的燃烧特性进行了分析。结果显示,不同工况下不同燃烧方式会影响系统的模态及其稳定性。在非设计工况下运行时,火焰的轴向位置和燃烧放热的变化也对系统稳定性产生影响。这些结果可以帮助我们尽可能选择在稳定的条件下运行,防止可能出现振荡燃烧的情况,实现燃烧系统在全工况下安全、高效、清洁地运行。

The mechanism of vacillating combustion is being elucidated in brief. The combustion instability under design and off-design conditions is calculated and analyzed by way of analyzing the flow field of the staged combustion chamber at low and at full load with the help of linear analyzing methods. Results show that under different operating conditions, the system＇s mode and its stability is influenced by the difference in combustion arrangement. Under off-design operating conditions, shifting of the flame＇s axial position and its heat release may also influence the system＇s stability. These results may be of help, in the design stage and during operation, for staged combustion systems to arrange operation to proceed as much as possible under stable conditions, avoid vacillating combustions and actualize the system to operate safe, efficient and clean in the whole working range. Figs 21 and refs 9.