为提高重型燃气轮机进气蜗壳的气动性能，采用ANSYS FLUENT2022软件模拟空气在进气蜗壳内流动。首先计算分析原结构收缩段对气动性能的影响，然后提出了一种贝塞尔曲线作为进气蜗壳收缩段型线，并研究了不同贝塞尔曲线参数对气动性能的影响。计算分析主要以出口截面的平均速度不均匀度和总压畸变参数来评价结构优劣，以进口速度25.91m/s，温度16°，湍流强度2.18%作为边界条件进行计算。得出结论：改进结构相比与原结构涡流区域明显减小，平均速度不均匀度降低了54.62%，总压畸变参数降低了43.02%。

In order to improve the aerodynamic performance of the intake volute of heavy-duty gas turbine, ANSYS FLUENT2022 software is used to simulate the airflow in the intake volute. Firstly, the influence of the contraction section of the original structure on the aerodynamic performance is calculated and analyzed, and then a Bezier curve is proposed as the shape of the contraction section of the intake volute, and the influence of different Bezier curve parameters on the aerodynamic performance is investigated. The calculation and analysis are mainly based on the mean velocity inhomogeneity and total pressure distortion parameters of the outlet cross-section to evaluate the structural advantages and disadvantages, and the inlet velocity of 25.91m/s, temperature of 16°, and turbulence intensity of 2.18% are used as the boundary conditions for the calculations. It is concluded that the vortex areas are significantly reduced in the improved structure compared to the original structure, the average velocity inhomogeneity is reduced by 54.62%, and the total pressure distortion parameter is reduced by 43.02%.

航空发动机及燃气轮机基础科学中心项目（P2022-C-I-001-001)；上海市重型燃气轮机领域联合创新计划(UIC计划)资助项目，《重型燃机部件级气动设计仿真和试验研究》