旋流片旋流角度对低热值煤层气燃烧特性的影响

Influence of swirl angle of swirling slice on combustion characteristics of low heat value coal-bed methane

基于自行搭建的低热值煤层气燃烧实验系统,设计了4种由不同旋流角度的旋流片组合成的低热值煤层气燃烧器,并进行燃烧特性的实验研究,分析了旋流角度对于燃烧室内速度、温度及火焰结构特性的影响。研究表明:旋流角度对燃烧室内的流速、温度及火焰结构特性有重要影响,旋流角增大,最大轴向速度向燃烧室后部偏移,轴向温度峰值向燃烧室前部偏移,温度峰值先增后减。旋流片旋流角为45°时,燃烧室内流速和温度分布最均匀,且平均火焰长度较短,平均火焰直径最大,火焰充满度更好。

Based on the self-developed combustion test system of low heat value coal-bed methane,four combustors with different swirl angle of swirling slices were designed for the experimental research.Influence of swirl angle of combustor on flow velocity,gas temperature and flame structure in the combustor was investigated.The results show that the swirl angle of combustor has an important influence on the flow velocity,gas temperature and flame structure.When swirl angle increases,the maximal axial velocity moves to the back of combustion chamber but the peak of axial temperature moves to the front and the peak temperature first increases then decreases.When the swirl angle of swirling slices is 45°,the distribution of velocity and temperature in the combustion chamber is more uniform,the average flame length is shorter,the average diameter of flame is maximal and the fullness of flame is better.