Optimization Design Of Aspirated Blade Coupled With Suction Parameters

Aspirated compressor is one of the most significant ways to improve the compressor load. In thispaper, investigations on aspirated compressor design have been done, and influences of suctionparameters on arbitrarily rotational cascade, as well as influences of combination suction on flow ofblade passages have been discussed by means of optimization method and numerical analysis method,providing some experiences for high-efficiency, high-load aspirated compressor blade design.Firstly, an optimization design tool for designing aspirated compressor arbitrarily rotationalsurface profiles has been developed. Combined optimization method and flow field numericalcalculation method, this tool can realize automatic optimization design of aspirated compressor. Threedimensional calculations of aspirated blade have been carried out by NUMECA, and the result ofwhich was compared with that of self-programming software.Secondly, the basic flow of aspirated compressor blade design has been established. Taking anlow-speed, high-load aspirated rotor for example, the method of throughflow design, aspiratedarbitrarily rotational suface profile design and three dimensional blade design has been studied.In consideration of the importance of loss model, an iterated design method using results of threedimensional calculations to provide loss model of S2flow surface calculation was adopted, whichimproved S2flow surface calculation precise. The aspirated arbitrarily rotational suface profile designwas based on quasi three dimensional approaches. Taking profile parameters and suction parametersas design variables, the coupling optimization design of them was realized, which comprehensivelyconsidered the two changes. Then the three dimensional blade design was carried out, which couldmodify the bow and sweep of stacking line and meridional surface profile. An aspirated rotor bladewas designed by this method. With a total pressure ratio of1.63and efficiency of0.965at a229m/stip speed, high aerodynamic performance was achieved.Thirdly, influences of suction parameters on arbitrarily rotational cascade have been studied, andcame to a same conclusion with that on plane cascade. Through slotting on end walls along thecircumference, the influences of combination suction on flow of blade passages have been discussed.The results show that it can improve the flow condition of end wall region by conducting the end wallboundary layer suction reasonably. But it might lead to boundary layer separation on suction sectional,which would cause an extra loss.Finally, the design method of aspirated stator blade has been explored. Using quasi three dimensional approaches could obtain an aspirated stator which could meet the basic requirements, butthe stage efficiency was a little low matching with the rotor designed before. In addition, studiesshows that it can effectively restrain corner separation and improve the flux capacity of end wallregion by conducting the end wall boundary layer suction of stator reasonably, and improve theoverall performance of compressor stage. Because of the three dimensional flow effects, it was neededto improve the design adopting three dimensional design methods.