先进旋涡燃烧室速度场与温度场协同数值研究

Numerical Analysis of Field Synergy Between Velocity Field

关键词:  先进旋涡燃烧室  场协同  换热  数值模拟

Key words:  Advanced vortex combustor  Field synergy  Heat transfer  Numerical simulation

摘要:

为了探讨先进旋涡燃烧室流动传热特性，基于场协同原理，对不同来流速度、来流温度、壁面温度及燃气当量比下燃烧室的速度场、温度场及其场协同角分布进行了数值模拟。结果表明，协同角较小的区域主要分布在后钝体后侧、凹腔内部以及进气通道横向中心截面上。旋涡区可以强化换热。随着来流速度及来流温度的增大，场平均协同角呈递减趋势；随着壁温的提高，场平均协同角增大；当量比小于1.0时，场平均协同角随着当量比的增大而增大，而达到1.0之后变化不明显。对于速度场与温度场，燃烧室中心截面的场协同性能最好，且体平均协同角大于面平均协同角。

Abstract:

In order to investigate the flow and heat transfer characteristics of Advanced Vortex Combustor (AVC)based on field synergy principle，the effects of incoming velocity，incoming temperature，thermostatic wall temperature and equivalent ratio on velocity field，temperature field and the field synergy angle between velocity field and temperature field were numerically calculated. The results show that the smaller synergy angle areas are mainly located in the rear side of the rear blunt body，the cavity and the horizontal central section of the intake passage. Vortex area can enhance heat transfer. With the increase of the incoming velocity and the incoming temperature，the average synergy angle reduces. As the thermostatic wall temperature increases，the average synergy angle increases. When equivalent ratio is less than 1.0，as the equivalent ratio increases，the average synergy angle increases. However，when equivalent ratio is larger than 1.0，the change of synergy angle is not obvious. The field synergy performance is the best in the center section of AVC. The volume-average synergy angles between velocity field and temperature field are larger than the area-average synergy angles.