小型回流燃烧室燃烧特性数值研究

Numerical Study on Combustion Characteristics ofSmall-Scale Reverse Flow Combustor

关键词:  数值计算  燃烧室  蒸发管  湍流燃烧  炭黑粒子

Key words:  Numerical calculation  Combustor  Evaporation tube  Turbulent combustion  Carbon black particles

摘要:

某科研样机采用蒸发管回流燃烧室，其燃烧室结构复杂，燃烧机理和气流流动情况尚不清楚。在实验过程中发现，蒸发管及附近的火焰筒壁面上出现了较严重的积碳现象，影响燃烧室的性能。为了探究该型燃烧室的工作过程、分析积碳现象的原因，采用k-ε湍流模型、旋涡耗散概念燃烧模型(EDC)以及颗粒随机轨道模型对该燃烧室工作流场进行流固热耦合数值计算。结果表明，燃烧室性能参数计算值与台架试车数据较吻合，各项参数相对误差均小于1.7%。计算得到了燃烧室工作时流动和燃烧情况，同时分析出了各气孔流动情况及发挥的作用，并得出了产生积碳现象的原因，为该型燃烧室优化设计提供依据。

Abstract:

A scientific research prototype has a reverse flow combustor with evaporation tube. The combustor structure is complex, and the combustion mechanism and airflow are unclear. During the development process, it was found that carbon deposition occurred on the wall of the evaporator tube and the nearby flame tube, which affected the performance of the combustor. In order to explore the working process of the combustor and analyze the cause of carbon deposition, the k-ε turbulence model, Eddy-Dissipation-Concept (EDC) combustion model and particle random orbit model were used to calculate the fluid-solid phase coupling of the flow field of the combustor. The results show that simulation results are in good agreement with the experimental data, and the relative error of each parameter is less than 1.7%. The flow and combustion of the combustor were calculated, the flow and function of each pore were analyzed, and the cause of carbon deposition was obtained, which provides a basis for the optimal design of the combustor.