仿鸮翼离心压缩机叶轮的参数优化及性能研究

There are practices that airfoil imitates bird's wing to improve the efficiency. Inspired by this, the paper attempts to improve the aerodynamic performance of the centrifugal compressor with the bionic impeller imitating owl's wing combined with the optimized meridian channel profile parameters. Firstly, the aerofoil inspired by the 40% section in the span direction of the long-eared owl wings, which shows excellent aerodynamic performance, is taken for reverse bionic reconstruction. The bionic centrifugal compressor impeller is designed according to the thickness distribution of the long-eared owl's wing. After that, the parametric optimization of the meridian channel profile on the impeller blade top is conducted through Latin hypercube sampling, BP neural network fitting, and genetic algorithm optimization, and numerical analyses on the centrifugal compressor's aerodynamic performances and internal flow characteristics before and after optimization arc carried out. The results show that the bionic impeller combined with the optimized meridian flow passage parameters significantly improves the internal flow field and the aerodynamic performances of centrifugal compressor. The polytropic efficiency and the pressure ratio of the optimized centrifugal compressor increase by 3. 16% and 2. 61% respectively under the design condition. The high entropy regions inside the impeller and at the blade diffuser outlet arc reduced, and the flow separation is effectively suppressed. At the same time, the load on the blade surface increases and is more evenly distributed, and the work ability of the impeller is enhanced.