某100,kW微燃机燃烧室结构优化及数值模拟

Structural Optimization and Numerical Simulation for a 100kW Micro Gas Turbine Combustor

为解决某微型燃气轮机燃烧室的燃料由燃油改为燃气时出现的火焰偏长、出口温度均匀性差的问题,对此燃烧室的头部和掺混孔的结构进行了优化设计,并利用计算流体力学方法研究了燃烧室头部结构和各区段空气量分配比例对燃烧室内燃烧过程的影响.研究结果表明,采用带有旋流器的多孔喷头能够促进燃烧室内燃气与空气的混合,有效解决燃烧室内火焰偏长的问题.采用多孔、多段的掺混孔能够避免掺混空气在燃烧室出口集中送入,更利于燃烧室出口温度的均匀分布.

In order to solve the problem that the combustion process was still present at the exit of combustionchamber and the outlet temperature uniformity was poor when its fuel is changed from oil to nature gas,the structureof combustion chamber was modified.Computational fluid dynamics method is employed to study the influenceof the structure of combustion chamber and the proportion of air distribution in each zone on the combustionprocess.The results show that the porous combustor dome can promote the mixing of gas and air in the combustionchamber,which can effectively solve the problem of long flame in the combustion chamber.Multiple mixingholes can be used to avoid the feeding of the mixed air in the combustion chamber outlet,which is more favorableto the uniform distribution of temperature in the combustion chamber.