折流燃烧室间接点火过程研究

Indirect Ignition Process of Slinger Combustor

关键词:  折流燃烧室  间接点火  大涡模拟  试验  贫油点火边界

Key words:  Slinger combustor  Indirect ignition  Large eddy simulation  Experiment  Lean ignition boundary

摘要:

为了研究折流燃烧室的间接点火过程，对三种不同初始火核位置的燃烧室进行大涡模拟计算，并结合燃烧室点火试验和性能试验进行验证。研究结果表明：折流燃烧室的主燃区可分为三个区域，分别是主回流区、横跨气流区以及次回流区；燃烧室点火成功的关键在于初始火炬进入次回流区；通过大涡模拟计算得到的贫油点火边界油气比与点火试验结果的绝对误差在0.004以内。

Abstract:

In order to study the indirect ignition process of the slinger combustor， the large eddy simulation （LES） of the combustor of three different initial fire kernel positions is carried out. The simulation results are verified by ignition experiment and performance experiment. The results show that the main combustion zone of the slinger combustor can be divided into three zones， namely a main recirculation zone， a cross gas flow zone and a secondary recirculation zone. The key to the successful ignition of slinger combustor is that the initial torch enters the secondary recirculation zone. The absolute error of the fuel-air ratio （FAR） at lean ignition boundary between LES simulation and the ignition experiment is within 0.004.