Influence of deterministic stresses on flow prediction of a low-speed axial flow compressor rear stage

Deterministic stresses are used to describe the unsteady effects on the flo w field in multistage axial flow compressors. In this paper, a circumferent ially non-uniform mixing plane method implemented with deterministic stress es is used for the flow prediction inside the rear stage of an axial flow c ompressor in a multistage environment. The deterministic stress field is ca lculated with an overlapped solution approach for the same flow passage and implemented with the Navier-Stokes equations in order to provide continuou s interfaces. The aerodynamic boundary condition is simplified with the app lication of a repeating stage model where only the mass flowrate and stage exit average static pressure are required. Two computational cases for the third stage of the Cranfield low-speed research compressor, one with the mi xing plane model and the second with the mixing, plane model in combination with deterministic stresses, are examined and compared with each other and also with corresponding experimental data. It is shown that the implementa tion of the deterministic stresses is beneficial for the flow prediction bu t the improvement in accuracy for low-speed axial flow compressor rear stag es is not significant.