微燃机双面复合叶轮压缩特性

为追求高性能参数、高新技术装备的核心机,基于结构融合、过程融合思想,对传统微燃机核心机进行融合创新。基于3D打印设计制造技术基础,创新设计了一种双面常规叶轮与空心涡轮叶片径向连接为一体的双面复合叶轮结构,有望成为未来极具潜力的高效叶轮。具体对基于双面复合叶轮的微燃机工作原理,结构方案及预期性能进行初步分析,重点对双面复合叶轮的压缩特性与后进气管换热特性进行了数值模拟研究。结果表明:该叶轮相比常规叶轮,压缩特性符合预期,较为理想,在压比、流量、效率方面均有显著提高;后进气管回收4.4 K尾气温度可提高热效率,为高气动性能、高循环参数的燃气轮机发展奠定了基础。

Compression performance of double-sided composite impeller with micro gas turbine

In order to achieve the core engine with high performance parameters and high-tech equipment, based on the ideas of structural fusion and thermal process fusion, the core engine of traditional micro-turbine was integrated through innovation. Based on the 3D printing design and manufacturing technology foundation, a double-sided composite impeller structure was designed, with a radial connection of a double-sided conventional impeller and an axial-flow turbine, making it possible to become a type of high-efficiency impeller with great potential in the future. Specifically, the principle, structural scheme and expected performance of the micro gas turbine were analyzed. Numerical investigation of aerodynamic compression performance of a double-sided composite impeller and backward pipe heat transfer characteristics was primarily studied. Results show that compared with the conventional impeller, the aerodynamic compression performance of the double-sided composite impeller can meet the expectation perfectly. The total pressure ratio, flow rate and isentropic efficiency have been greatly improved; the recovery of 4.4 K exhaust gas temperature in the rear intake pipe can improve the thermal efficiency. It has laid the foundation for the development of gas turbines with high aerodynamic performance and high cycle parameters.