Suck Surface Slotted And Blowing-sucking Boundary Layer To Enhance Stator Load Was Investigated By The Means Of Numerical Simulation

Based on a large turning angle planar cascade, a tow-dimension simulative system of the blowing-sucking cascade and natural cascade were founded in this dissertation. The dynamics performance of these two kinds of compressor cascade had been investigated by the means of numerical simulation. In addition, in order to explore the affection of blowing-sucking on the performance of cascade, different cases of blowing-mouth and sucking-mouth in its suction face were studied.First of all, a grid generation approach is developed by end to end joint techniques, which could generate hybrid grid for the tow-dimension flowing field of a planar cascade. This grid procedure overcame the disadvantage of lacking flexible character when the single grid is used, which improve the grid quality and make the generation of grid in complex area much easier.Secondly, using commercial FLUENT software, two-dimensions N-S equations were solved. The aerodynamic performance of natural and blowing-sucking large turning angle cascade are numerical investigated. The investigative result shows that the aerodynamic performance of cascade is meliorated obviously with the use of boundary layer blowing-sucking technique. The boundary layer airflow separation is avoided. And the load on the cascade is increased largely. Comparing with the natural cascade, the diffusion factor of blowing-sucking cascade in this paper enhance by 4.46%,the turning angle of airflow increase by 25.1%, and the total pressure loss-coefficient decrease by 25.1%.Finally, in order to explore the principle which blowing-mouth and sucking-mouth affect the performance of cascade, the blowing-mouth location, the blowing-mouth height, the sucking mouth location, and the blowing-sucking airflow rate were studied. The results show that how to the performance of cascade is affected by the blowing-mouth and sucking-mouth is connected with the blowing-sucking airflow rate hardly. Furthermore the cascade has a good integrative performance as the blowing-sucking airflow rate near 3%. At this case, as the blowing-mouth location is moved from lead to rear, the total pressure loss coefficient decrease first and increase later. The diffusion factor increase first and decrease later, and the extremum is found at 25%L and 20%L each. When the blowing-moth height is increased, the turning angle of the cascade decreased little by little. And the variational quantity is lessened as the height is bigger than 0.7mm. The pressure loss coefficient increase at first then decrease latter. And the minimum is gotten at 0.6mm height. Comparing with blowing mouth location and height, the sucking moth location has a weak affection on the performance of cascade.