【摘要】 本文研究了在静止扩压环形叶栅中如何实现非定常自然流型(UNFT)向非定常耦合流型(UCFT)的转变,以及耦合流型对轴流压气机能带来多大的时均性能提高。在环形叶栅台上的大量实验研究表明:当以一定方式实现非定常耦合流型后,其分离旋涡缩小,流场中涡量减小,流动损失下降,时均性能有较大幅度提高。实验中将常规的气动感头测量和小惯性热线风速仪测量以及数字式PIV瞬态场测量技术相结合,来获得非定常两代流型的流动图案和时均性能及其相互比较。更多还原

【Abstract】 In this paper, procedures to transform UNFT (Unsteady Natural Flow Typ e) into UCFT (Unsteady Cooperative Flow Type) in annual static diffusion cascade have been investigated together with the time-average performance improvement i n axial compressor with UCFT. The large amount of tests carried out in annual ca scade test rig has proved: With UCFT, the separation vortex, vorticity in flow f ield and dynamic loss have been reduced, while the time-average performance has been significantly improved. The conventional aerodynamic probe, hot-wire anemom eter with small inertia and digital PIV(Particle Image Velocimeter) transient fi eld instrumentation have been combined in the tests to obtain the flow diagram a nd time-average performance of the two flow types as well as the comparison resu lts.更多还原