RQL模型燃烧室数值研究

摘要

以截面积为矩形截面的RQL模型燃烧室为研究对象，采用数值模拟方法分别研究了旋流器各参数（如出口角θ、轮毂与流路外径比z和旋流器间距）和淬熄段射流孔参数（如孔数和射流孔截面积）对模型燃烧室流场、温度场以及NOx排放值的影响。在数值模拟中采用的模型包括Realizable κ-ε湍流模型、非预混燃烧模型、热力型NOx和瞬发型NOX等。通过对模拟结果进行比较分析得出结论：当模型燃烧室采用间距为69mm、θ=30°、z=0．68的旋流器和总面积为635．85mm。的12个淬熄射流孔的结构时，可以在满足燃烧室基本性能的前提下实现低污染排放。%A rich-quench-lean （RQL） model combnstor with a rectangular cross-section was studied. The influences of swirler parameters （such as outlet angle θ, ratio of inner diameter to outer diameter z, spacing between swirlers） and parameters of the jet holes in quench zone （such as the number of jet holes, total section area of the holes） on flow field, temperature field, and NOx emissions of the combustor were investigated by the numerical simulation. The models adopted in the numerical simulation were Realizable κ-ε turbulence model, non-premixed combustion model, discrete ordinates radiation model, thermal NOx model and prompt NOx model. Based on the simulation results, the conclusion can be reached that a model combustor with swirlers of spacing 69 mm, θ=30°, and z=0.68 and 12 jet holes having total section area 635.85 mm2 in the quench zone can realize the basic combustion performance and low emissions.