轮廓度加工超差对压气机气动性能影响的数值研究

Numerical Investigation of Profile Variability on Axial Compressor Flow Field Performance

在压气机叶片加工过程中,轮廓度较难保证,极易出现加工超差,对压气机的气动性能产生影响。以单级轴流压气机为例,通过数值计算研究了轮廓度加工超差对压气机气动性能和局部流场的影响规律。结果表明,动叶尖部轮廓度超差对压气机等熵效率的影响最为显著,而动叶根部轮廓度超差对压气机总压比的影响最大。进一步的敏感性分析指出,轮廓度的变化与轴流压气机的总性能参数呈现负相关特性,并且,随着叶片轮廓度的增大,进口负攻角逐渐增大,流动损失增加。

In the compressor manufacturing process, the profile tolerance of blades is hard to promise, which will easily cause the manufacturing variability and affect the compressor? s aerodynamic performance. Large amounts of simulation were performed in a single-stage axial compressor to analyze the influence of profile variability on the aerodynamic performance and local flow field. The results indicate that profile tolerance of the rotor5 s top section affects most to the isentropic efficiency while profile tolerance of the rotor? s bottom section affects most to the total pressure ratio. The further sensitivity analysis points out that the profile variability leads to negative linear variation of the total performance parameters, and with the increasing of the profile tolerance, the negative incidence angle gradually increases, and the flow losses increase, too.