离心式空气压缩机全三元叶轮气动优化

Aerodynamic Optimization of Full Three-dimensional Impeller of Centrifugal Air Compressor

文章以某单级离心式空气压缩机为研究对象,使用CFD软件对叶轮子午流道、叶片β角、叶片出口倾角、叶片弯曲规律进行优化。研究结果表明:改变子午流道Shroud线对气动性能的影响比Hub线敏感;调整叶片β角,使顶部载荷前移能够改善叶片出口脱流情况;出口负倾角,有助于提高压力;叶片入口朝压力面弯曲,叶片表面不容易脱流,压力效率有不同程度提高。优化后的全三元叶轮级等熵效率提高约3%,总压比提高约8%。

Taking the single-stage centrifugal air compressor as the research object, this paper uses CFD software to optimize the meridional channel of impeller, β angle, blade outlet inclination and blade bending law. The results show that the influence of changing the shroud line of the meridional channel on the aerodynamic performance is more sensitive than the hub line;Adjusting the blade β so that the top load moves forward can improve the flow separation at the blade outlet;The negative inclination of the outlet helps to increase the pressure;The blade inlet bends towards the pressure surface, the blade surface is not easy to flow off,and the pressure efficiency is improved to varying degrees. The isentropic efficiency of the optimized three-dimensional impeller stage is increased by about 3%, and the total pressure ratio is increased by about 8%.