Aerodynamic Design Of Sectorial Cascade For The Research Of Non-axisymmetric Stator Under Distorted Conditions

High performance aircraft engines and gas turbines provide high demand for high efficiency,high efficiency and high stability margin.In practical applications,the compressor works almost exclusively under the condition of distortion intake.After steady total pressure distortion decayed in rotor,before the stator is mainly shows flow angle distortion,the stator corner separation area influenced by distortion fluid is a large scale,so that the compressor performance and stability decreased.However,the stage experiment is difficult and the cost is high,and the data is not easy to measure.Therefore design the sectorial cascade experiment with adjustable guide vane,ensure the stator inlet conditions consistent with it in the stage,included the distortion conditions and enough measurable number of channels have important meaning of study.In this paper,First of all,a adjustable guide vane(AGV)for the sectorial cascade experiment was designed in this paper in order to simulate the outlet airflow parameters of the real compressor rotor blade.Three inlet guide vanes were designed according to a given exit flow angle distribution curve average of circumferential pitch along the relative blade height of the compressor rotor and the final design airfoil was obtained by gradually optimizing the three cases to satisfy the target curve.Then,the baffle truncated modify was applied to improve the periodicity of the sectorial cascade.The numerical results show that the baffle truncated model can availably improve the periodicity of the sectorial cascade.Contrasted to the original baffle model,the passages with better periodicity increases from 3 to 7 in baffle truncated model 3,and meet the periodicity requirement established in this paper for the experiment.Finally,a test method getting an inhomogeneous stator inlet by changing the installation angle of some adjustable guide vane(AGV)in sectorial cascade was presented in this paper.Non-axisymmetric stator was designed by sweeping and bending for improving the stator flow field.And the improvement of flow field in stator is studied by numerical method.The numerical results show that it is acceptable to achieve the distortion parameters in stator inlet with the method of AGV.The stator flow field characteristics and corner separation in the inhomogeneous stator inlet condition are able to discuss.The non-axisymmetric stator designed in this paper can decrease the losses in stator passages influenced by distortion fluid to a certain degree and inhibit corner separation in stator suction.