Optimization Design Of High-loaded Compressor Stator

With the development of aviation gas turbine engine, it puts forward demand of high-loadedcompressor. As the stall caused by stator is an important factor limiting the stable operation range ofhigh-loaded compressors, the main task of this paper is to get a stator by mean of optimization design,which can well matched with the rotor of a high-loaded compressor’ s first stage.A quasi-three-dimensional method was adopted to design the original stator in this paper, thenthe original stator was optimized in three-dimensional environment. During the process of profilesoptimization design on S1stream surfaces, boundary conditions and objectives of different statorsections were given by S2stream surface calculation. After completing profiles design of differentstator sections, a three-dimensional blade was obtained through stacking five sections along the span.This three-dimensional blade was treated as original blade during the process of three-dimensionaloptimization design. Then, considering characteristics of real three-dimensional flow, the flow fieldcalculation of three-dimensional optimization design was executed in stage environment. Aiming toprovide advices for parameter selection in the three-dimensional optimization design process,influences of meridional channel modification, end-bend, sweep of stacking line, bend of stacking line,different load distributions and different inlet boundary layers were studied in this paper.Comparison the results got by flow field calculation program in the optimization software withexperimental values showed that accuracy of the calculation program in optimization software is good.Several optimization design examples of subsonic cascade and supersonic cascade were successfullydone with the software, all cascades have reached their design goals. According to the optimizationresults, it was found that the negative load in the trailing edge of the blade is beneficial forimprovement of cascade performances. Meridional channel, stacking line, blade profile, installationangle and chord length were set as design parameter during the optimization design. After thethree-dimensional optimization design, the mass flow was0.22%higher than the design values,entropy efficiency of stage at design point reached87%, that was4.62%higher than the original value.Comparing to the original stator, the stall margin of stage widened by4.10%and the separation regionwithin the stator passage was significantly reduced.