Aerodynamics Design Of High-Loaded Compressor Stator

The design of high-loaded compressor has become the key part of the modern aviation gas turbine engine,it demands that the compressor should achieve higher compression ratio and efficiency with less stages.As the corner stall caused by stator is an important factor limiting the performance of high-loaded compressors,the main task of this paper is to explore the method to control the corner stall,and to get a stator by mean of optimization design,which can well matched with the rotor of a high-loaded supersonic compressor's first stage.The air spoiler,increasing bend,modifying meridional channel and boundary suction were used to control corner stall.The result showed that the air spoiler and increasing bend can't improve flow situation in angle region and can't reduce total pressure loss.Modifying meridional and boundary suction can control the corner stall caused by stator,and improve the total pressure recovery coefficient.Surface suction which the relative flow rate of surface was 0.8% and circumferential suction which the relative flow rate of hub and shroud were both 0.5% were applied to a low speed and high-loaded compressor,the total pressure ratio was 1.080% higher and efficiency was 1.965% higher than the original value at the best efficiency point.A quasi-three-dimensional method was adopted to design the original stator in this paper,then the original stator was optimized in three-dimensional environment.The calculation result of NUMECA showed that the total pressure recovery coefficient of original stator was 0.9819 at design point,and there was the corner stall at the tip.The total pressure recovery coefficient was increased to 0.9830 through modifying meridional channel.After the three-dimensional optimization design,the total pressure recovery coefficient of stator was 0.9846,efficiency of stage at design point reached 85.26%,that was 4.62% higher than the original value,and total pressure ratio of stage at design point reached 0.9846,that was 0.68% higher than the original value.