叶片开缝和边界层抽吸耦合控制压气机失速裕度的数值研究

Numerical Study on Coupling of Blade Slotting and Boundary Layer Suction to Control Compressor Stall Margin

关键词:  耦合流动控制方案  叶片开缝  边界层抽吸  稳定裕度  跨声速压气机

Key words:  Coupled flow control method  Slotted blade  Boundary layer suction  Stability margin  Transonic compressor

摘要:

为了进一步优化压气机的整体性能，提出三种叶片开缝和边界层抽吸的耦合流动控制方案。首先，利用数值模拟的方法，研究叶片开缝或边界层抽吸对跨声速轴流压气机流场结构的影响机理。然后，详细研究了边界层抽吸分别与三种不同叶片开缝的耦合流动控制方案对压气机整体性能的影响。研究结果表明，与叶片开缝或边界层抽吸的单独应用相比，三种耦合流动控制方案都使压气机实现了更宽的稳定裕度。全叶片开缝与边界层抽吸的耦合方案稳定裕度改进量为1.27%，中间叶高开缝的耦合方案和上半叶高开缝的耦合方案稳定裕度改进量分别为1.67%和1.35%；在近失速点处，相比较全叶片开缝与边界层抽吸的耦合方案，局部开缝与边界层抽吸的耦合方案应用后，总压损失和效率降低；上半叶高开缝的耦合方案在三种耦合方案中稳定裕度最高，所以叶片开缝和边界层抽吸的耦合方案是可行的。

Abstract:

In order to optimize the overall performance of compressor effectively， three coupled flow control methods with slotted blade and BLS （Boundary Layer Suction） have been introduced. Firstly， influences of slotted blade or BLS on flow structure of a transonic axial compressor have been studied respectively by numerical simulation. Furthermore， effects of the coupled flow control method with slotted blade and BLS on overall performance of the compressor have been studied in detail. Results show that all three coupled flow control methods have achieved the wider stability margin of the compressor than separate application of the slotted blade or BLS schemes. The improvement in stability margin of the coupling scheme with full blade slotted blade and boundary layer suction is 1.27%， and the improvement in stability margin of the coupling scheme with slotted blade in the middle height and the coupling scheme with slotted blade in the upper half height is 1.67% and 1.35%， respectively. The combination of local-span slotted blade and BLS scheme have obtained the lower total pressure loss and isentropic efficiency at near stall point than the coupled scheme with full-span slotted blade and BLS scheme. The coupling scheme of slot in the upper half height has achieved the better improvement of stability margin among three coupled schemes. It has been considered that the coupled flow control method with slotted blade and BLS is feasible.