变截面管道旋流进气加热的数值模拟

为了研究整体强旋流进气对燃烧室状态改变和对应能量转换特性的影响,突出加热对旋转速度和旋转动能变化的作用,计算了等截面和变截面环形燃烧室中预混旋流甲烷/空气在冷态和燃烧态下的流场,并分析了流场旋流特性的变化。结果表明:提高轴向速度和使用变截面管道结构有助于提高旋流气体的旋转速度,旋流气体在加热条件下旋转速度会增大。采用变截面管道旋流进气加热能够较好实现热能向旋转动能的转变,在燃烧室设计中可以作为能量转换设计的1种潜在方法。

Numerical Simulation of Swirling Flow Inlet Heating of Variable Cross-section Duct

In order to study the effect of the inlet strong swirling flow on the state change of the combustor and the characteristic of the corresponding energy conversion,emphasizing the effect of heating on the change of the rotating speed and the rotating kinetic energy,the flow field in the cold and combustion state of the pre-mixed swirling methane/air in an equal cross-section and variable cross-section annular combustor was calculated and the change of the swirling flow characteristics of the flow field was analyzed.The results show that increasing the axial velocity and using the variable cross-section duct structure are helpful to improve the rotating speed of swirling gas,and the rotating speed of swirling gas will increase under heating condition.The transformation from heat energy to rotating kinetic energy can be realized by using swirling flow inlet heating in variable cross-section duct,which can be used as a potential method of energy conversion design in combustor design.