部分旋流对加力燃烧室流动和燃烧性能的影响

Effects of partial swirl on flow and combustion performance of afterburner

关键词:  加力燃烧室  超重力燃烧  旋流  离心力  流动特性

Key words:  Afterburner  High gravity combustion  Swirl flow  Centrifugal force  Flow characteristics

摘要:

为改善先进加力/冲压燃烧室燃烧组织困难等问题，采用设置进口部分旋流，在燃烧室中产生局部离心力来增强油气掺混和加速火焰传播。通过数值模拟和试验的方法，研究了不同旋流进口位置及角度下部分旋流加力/冲压燃烧室的流动特性、燃烧效率及值班点火火焰发展过程。研究发现：多区域旋流进口与不同旋流角度的组合会使流动损失增大，但可以在燃烧室建立一个局部超重力场，增强油气掺混和加速点火过程火焰传播。相比于无旋流，旋流进口可以提高值班火焰传播速度；旋流进口最高可提升2.35%的燃烧效率。

Abstract:

To improve the organization of stable combustion difficulties of the advanced after-ramjet-burner， the local centrifugal force created by the partial inlet swirling inflow is utilized to enhance the mixing of fuel and air and accelerate the pilot flame propagation. The flow characteristics， combustion efficiency， ignition process and pilot flame development characteristics of partial swirling afterburner under different swirl inlet position and angles are studied by numerical simulation and experimental methods. Results show that the swirl inlet combination with multi zones and different swirl angles will increase the flow loss， but it can establish a local high gravity field to enhance the mixing of fuel and air and accelerate the flame propagation in the ignition process. Compared with the non-swirl inlet， the swirl inlet can increase the flame propagation velocity in the pilot zone. Furthermore， the swirl inlet can increase combustion efficiency by up to 2.35%.