套筒角度对三级旋流燃烧室燃烧性能的影响

Effects of Flare Angle on Combustion Performance of a Triple Swirler Combustor

关键词:  单头部  多头部  燃烧室  燃烧性能  三级旋流器

Key words:  Single sector  Multi sector  Combustor  Combustion performance  Triple swirler

摘要:

为了更加深入地掌握小尺度三级旋流燃烧组织方法，开展了单头部与多头部模型燃烧室在不同进口速度和油气比参数下的燃烧性能试验研究。研究结果表明:同单头部燃烧室燃烧性能相比，三头部燃烧室的各项主要燃烧性能均得到不同程度的恶化，相同工况下三头部燃烧室的点火油气比和贫油熄火油气比较单头部燃烧室分别提高了约25%，100%，分析认为三头部燃烧室性能的恶化主要是由于套筒角度不合理，导致相邻两个主燃区气流之间存在相互干扰，而该干扰在低油气比时尤为明显；对于多头部燃烧室试验件而言，套筒角度过大或过小均会导致燃烧性能恶化，合理的套筒角度对多头部甚至全环燃烧室至关重要，得到的最佳套筒角度为37.5°。

Abstract:

In order to master the combustion organization method of small-scale triple swirler further，experiments were conducted to study the combustion performance of single sector combustor and multi sector combustor at different inlet airflow velocity and combustor overall fuel-air ratio (FAR) with fixed atmospheric pressure. The test results show that compared with the combustion performance of single sector combustor，each combustion performance of multi sector combustor has been deteriorating to various degrees，and the ignition FAR and lean blow out FAR of multi sector combustor increase by 25% and 100% respectively compared with the corresponding performance of single sector combustor at the same operating condition. Through in-depth analysis，the main reason of multi sector combustor combustion performance deterioration is the unsuitable flare angle，which leads to the interference in adjacent primary zone airflow，and this interference on combustion performance is especially obvious at low FAR. For multi sector combustor test rig，whether the flare angle is too large or too small would lead to the deterioration of the combustion performance，so the reasonable flare angle is crucial for multi sector combustor and full annular combustor，and the most reasonable flare angle matching multi sector combustor obtained in this paper is 37.5°。