轴流压气机周向槽扩稳机理的有效利用

Making Circumferential Grooves in Axial-flow Compressor More Effective

利用NUMECA软件数值模拟了某单级亚音轴流压气机在不同转速下的工作,在验证了数值模型的可靠性后,对压气机进行了多种周向槽结构的数值模拟。结果表明,周向槽扩稳的有效性并不单纯依赖于机匣的处理面积和槽深,而是更取决于有效的处理位置。当处理位置合适时可以以较少的槽数和较小的槽深达到较佳的处理效果。最佳槽深的设计应与失速类型以及压气机的类型紧密相关。对亚音压气机其槽深应根据扩稳要求和压气机的性能要求来设计,一定的槽深是一定的扩稳效果的前提。

In our opinion, existing papers in the open literature on making circumferential grooves more effective are still somewhat deficient in some respects. We now present our research results on making circumferential grooves still more effective. The first topic is： the rotor under study and the simulation. In topic one, we mention that we select software NUMECA for all computations performed. The second topic is ： the effectiveness of the stability extension of the various types of circumferential grooves. In the second topic, there are six figures supporting the preliminary conclusions reached; the most important conclusion is that, provided that the position of each groove is suitably selected, the satisfactory extension of the stable working range can be achieved with a smaller number of grooves and a shallower groove depth. The third topic is： the discussion of groove depth. In the third topic, there are three figures supporting our preliminary conclusions： （1） the optimum depth of the groove varies with the type of compressor and that of the stall; （2） for the subsonic axial-flow compressor, the depth should be designed in accordance with the requirements of compressor stability, efficiency and pressure ratio all considered; （3） last but most importantly, for subsonic axial-flow compressor, in order to increase the stall margin to some extent, some minimum amount of groove depth must be provided.