低旋流中心分级燃烧室流场特性研究

为了研究新设计的一种低旋流中心分级燃烧室流场特性,采用数值模拟和PIV试验结合的方法,针对其头部两级主副模旋流器的不同组合方案开展了研究。研究表明:低旋流下,单独副模旋流器工作时气流半角22.3°,无法形成回流区,同时,副模气流轴向速度在旋流器出口具有较大的速度衰减特性;回流区的形成是主副模旋流器相互作用的结果,流场呈径向分区特征,中心回流区在内,回流区最大径向尺寸小于主模旋流器外径,主模气流在回流区外,无回流区形成;不同副模旋流数下的流场结构基本一致,随着副模旋流数的增加,中心回流区的径向尺寸增大。

Study on Flow Field Characteristics of Low Swirl Concentric Staged Combustor

In order to study the flow field characteristics of a new designed low-swirl concentric staged combustor, numerical methods and PIV tests were carried out to study different combination scheme of two-stage main and pilot swirlers. The results show that under the low swirl, the individual pilot swirler cannot form the recirculation zone, the formation of the recirculation zone is the result of the interaction of the main and pilot swirlers. The entire flow field is characterized by radial zoning, including the central recirculation zone, and the main no recirculation zone outside the recirculation zone. The flow field structure under different swirl number of pilot is basically the same. However, as the pilot swirl number increases, the radial dimension of the central recirculation zone increases.