微型环形燃烧室数值模拟及优化设计

Numerical simulations and optimization of a micro annular combustor

为了优化微型环形燃烧室的设计方案,利用流体分析软件Fluent,采用RNGk-ε双方程湍流模型分别对两个微型环形燃烧室的内部流场进行了三维的冷态数值模拟,得出了它们的内部流场分布。两个模型分别是采用了航空发动机大型燃烧室设计理论及公式设计而成的燃烧室模型,和已经在实际中成功应用的国外某型微型涡喷发动机燃烧室模型。该文分析两个模型各燃区内计算流场的差异,确定了满足设计性能要求的目标流场,并对原有设计参数进行局部调整,使其流场组织向目标流场靠近。通过此方法,确定了燃烧室优化后的设计参数。

The design of a micro annular combustor was optimized numerically by computing the 3-D internal flow of combustors using computational fluid dynamics software Fluent with the RNG k-ε turbulence model. One combustor model was designed based on theory for aircraft engine combustor, the other was on a design for a previously proved micro-engine design. The flow fields in the two combustion chambers were compared to determine a reasonable flow field which could satisfy the design requirements. Then the design parameters for the first model were adjusted to close to the target flow field. The optimized design parameters were determined through this method.