基于钝体扰流的氢气微混扩散燃烧组织研究
收稿日期: 2023-04-24
修回日期: 2023-05-09
录用日期: 2023-05-23
网络出版日期: 2023-06-21
基金资助
先进航空动力创新工作站(HKCX2021-01-021);中央高校基本科研业务费专项资金;航空发动机及燃气轮机基础科学中心项目（P2022-A-Ⅱ-006-001）
Investigation on hydrogen micromix diffusive combustion organization based on bluff body disturbance
Received date: 2023-04-24
Revised date: 2023-05-09
Accepted date: 2023-05-23
Online published: 2023-06-21
Supported by
Advanced Jet Propulsion Innovation Center, AEAC(HKCX2021-01-021);The Fundamental Research Funds for the Central Universities;Science Center for Gas Turbine Project （P2022-A-Ⅱ-006-001）
氢气是实现航空发动机零碳排放最具有应用潜力的燃料之一，本文提出一种蜂巢钝体微混扩散燃烧结构，内置微型钝体扰流主流空气，以增强与氢气掺混。采用k-ω 剪切应力输运（SST）湍流模型和火焰面生成流行方法（FGM）中的扩散火焰方法，数值仿真模拟了基准方案在无氢气喷注、冷态、热态工况下的流动燃烧特性，详细分析了微混单元气动热力过程。建立了基于响应面预测和遗传算法的蜂巢微混单元优化设计流程，以钝体角度和钝体出口高度为约束条件，NO x 排放最低为优化目标，获得了NO x 排放的影响规律和最优方案。研究结果表明：钝体三维尾迹涡耦合氢气射流涡可显著增强主流扰动和掺混，氢气射流涡受工况和结构参数影响较大，钝体出口高度是影响NO x 生成的敏感性参数，在2 030 kPa和818 K的进气条件下，最优方案在15%含氧量条件下NO x 的体积浓度低于5×10-6。
莫妲 , 林宇震 , 马宏宇 , 韩啸 , 刘一雄 . 基于钝体扰流的氢气微混扩散燃烧组织研究[J]. 航空学报, 2024 , 45(8) : 128928 -128928 . DOI: 10.7527/S1000-6893.2023.28928
Hydrogen is one of the fuels with the most potential to achieve zero carbon emission of aero-engines. In this paper， a micromix diffusive combustion structure based on the honeycomb bluff body is proposed. The micro bluff body is built in the honeycomb to disturb the mainstream air and enhance its mixing with hydrogen. The flow and combustion characteristics of the standard scheme without hydrogen injection， the cold field， and the hot field are simulated using the k-ω Shear Stress Transfer （SST） turbulence model and the diffusion flame method in Flamelet Generated Manifold （FGM）. The aerothermal process of the micromixing unit is analyzed. The optimal design process of the honeycomb bluff body element is established based on Genetic aggregation approximate model. The design variables are angle and height of the bluff body whereas the minimum NO x emission is the optimization objective. The influences of the parameters on NO x emission and the optimal scheme are obtained. Results show that reverse rotating vortex pairs and three-dimensional jet vortices are formed in the cross section when hydrogen is injected into the high-speed mainstream air， the turbulent disturbance and hydrogen and air mixing are significantly enhanced， the hydrogen jet vortex is considerably affected by the working conditions and structure parameters， and the height of the bluff body is the sensitive parameter affecting the formation of NO x . Under the intake condition of 2 030 kPa and 818 K， the NO x emission of the optimal case is lower than 5×10-6 under the 15% O2 content condition.
Key words： hydrogen; micromix combustion; NO x; bluff body; vorticity
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