基于航空发动机吞砂能力提升的中介机匣优化设计与研究

Optimization of intermediate case based on sand ingestion capability improvement of the aero-engine

航空发动机吞砂试验过程中,砂粒进入核心机会对压气机和涡轮部件造成损伤,影响发动机性能和可靠性。减少砂粒进入核心机是提高涡扇发动机吞砂能力的有效手段。以涡扇发动机风扇及其中介机匣为研究对象,采用CFX软件开展了风扇和中介机匣吞砂仿真分析,并对分流环进行了优化设计。仿真结果表明,优化方案在满足涵道比和总压恢复系数等气动性能不降低的基础上,可提升分离砂粒的能力,减少进入发动机内涵的砂粒量,进而提升发动机的吞砂能力。

During the sand ingestion test of the aero-engine,sand particles enter the core engine,causing damage to the compressor and turbine components,and thus worsening the engine’s performance and reliability.Reducing the sand particles that enter the core of the aero-engine is an effective method to improve the sand ingestion capability.Taking the intermediate case of a turbofan engine as the research object,a two-phase flow simulation of the fan and intermediate case was carried out by using CFX software.Then the splitter ring of the intermediate case was optimized.The simulation results show that the optimized splitter ring can enhance the ability to separate sand particles and reduce the amount of sand entering the core engine,while the bypass ratio and loss remian almost unchanged.