Numerical Analysis On Combined Adjustment Of Guide-Vane, Stator And Operating Speed About Three Stage Axial Compressors

For high power axial-flow compressor mechanical devices, it is difficult to implement the optimization of performance, with the single measure of depending on reduction of speed. The Technology of adjustable inlet guide vane and stator has a good development prospect, because of without limitation of power range.As a result, numerical simulation was conducted for the three-stage axial compressor. Thispaper analyses the separation losses and stall margin at design and off-design speed operating conditions, by changing the angle of inlet guide vane and stator. With different match of stagger angle between inlet guide vane and stator, the change tendency, as well as the characteristics of compressor efficiency and stability are investigated. At first, simulation scheme of single blade is arranged to obtain the efficiency and pressure ratio characteristics with different stagger angle of vane/stator. Based on the result, simulation scheme of vane-stator linkage is arranged, and then the calculation is accomplished..The development trend and Effect of vane-stator linkage adjustment on performance and stability is studied at off-design operating condition, through observing and analyzing interior flow fields. The results shows that the one-blade and vane-stator linkage adjustment can push stall boundary to a smaller mass flow rate, basically maintaining the highest efficiency. However, the effect of vane-stator linkage adjustment is better than the one-blade adjustment. The investigation of adjustment system provides the reference and basic standard for scheme design of self-adaptive control scheme in practice.