双侧进气突扩燃烧室冷态三维流场数值模拟

NUMERICAL STUDIES ON FLOWS IN A DUAL-INLET DUMP COMBUSTOR

关键词:  两侧进气道  突扩燃烧室  三线流  流场  数值法和计算方案

Key words:  Side-inlet  Dump combustion chamber  Three dimensional flow  Flow field  Numerical method and procedure

摘要:

用k-ε模型及SIMPLE算法对双侧进气突扩燃烧室的进气道及主燃室进行了冷态流场数值模拟,分别对主燃室和进气道进行了二维模拟及三维模拟;燃烧室的突扩比为1.1。计算结果表明:在进气道的预燃室旋流器后方形成了一个细长的中心回流区,回流区延伸到预燃室外的主燃室中,主燃室在头部有一个小回流区,在进口处也有一个极小的回流区。研究结果表明,主燃烧室中现有回流区尺寸及强度不能满足火焰稳定的要求,须进一步采取其他措施以改进火焰稳定。

Abstract:

The three-dimensional gas flow field in a dual-inlet combustor and the axisymmet-rical gas flow field in an inlet-tube of this combustor are numerically simulated by using k-ε turbulence model and SIMPLE algorithm. The sudden expansion ratio of combust6r is 1. 1. The predicted results show that there is a slim recirculation zone behind the swirler of pre-combustor which is located inside the inlet-tube, and the recirculation zone is extended to the primary zone of the combustor. There is a small recirculation zone in the head part of the combustor. It can be concluded that the recirculation zone in the combustor cannot stabilize the flame, and other measures such as using a pre-combustor must be adopted to improve the flame stability.