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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (8): 128928-128928.doi: 10.7527/S1000-6893.2023.28928

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Investigation on hydrogen micromix diffusive combustion organization based on bluff body disturbance

Da MO1,2,3, Yuzhen LIN1,2, Hongyu MA3, Xiao HAN1,2(), Yixiong LIU3   

  1. 1.National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics,Research Institute of Aero-Engine,Beihang University,Beijing 100191,China
    2.Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China
    3.AECC Shenyang Engine Research Institute,Shenyang 110015,China
  • Received:2023-04-24 Revised:2023-05-09 Accepted:2023-05-23 Online:2024-04-25 Published:2023-06-21
  • Contact: Xiao HAN E-mail:han_xiao@buaa.edu.cn
  • 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)

Abstract:

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

CLC Number: