Numerical Investigation of Leaned Strake in the Ram-rotor

Abstract

Abstract The concept of lean commonly adopted in conventional compressors is introduced into the design of the ram-rotor strake, and numerical simulation of the effect of lean on the aerodynamic performance of the ram-rotors has been conducted in this paper. Three types of leaned ]0strake schemes are modeled and analyzed first to investigate the effect of lean on pressure rise and loss characteristics, and then based on C-mid scheme, different amounts of leaning angle are chosen for further research so as to improve the performance of leaned ram-rotor. Results show that the application of lean can affect the intensity and position of shock system. Radial transport and accumulation of low momentum fluid in the boundary layer of suction surface is suppressed. Compared to baseline, C-cas scheme increases total pressure ratio by 2.338 %, however, C-hub scheme improve the adiabatic efficiency by 0.462%. For C-mid scheme, a slight reduction of performance is observed.