Establishment of standard model of linear cascade wind tunnel for subsonic compressor（NPU-MGS1））

The standard model of compressor cascade with a typical controlled diffusion airfoil is designed and tested based on linear cascade wind tunnel of Northwestern Polytechnical University. The flow quality of the standard cascade consists of inflow precision, flow periodicity, and two-dimensionality are adjusted by a self-established integrated control system.

On the basis of examining the flow quality, the performance of the standard cascade is measured, including the features of incidence and axial velocity density ratio, as well as the distributions of surface isentropic Mach number and wake, and compared to the reference cascade data published by DLR. The results show that the standard cascade exhibits good flow periodicity and homogeneity, including a uniform region over four successive blade passages upstream and a periodicity range over two successive blade passages downstream, and the periodicity index of outflow is less than 2.