Abstract
A numerical investigation has been conducted on the ram-rotor with various blade-to-blade profiles to achieve potential benefits in enhancing their performance. The blade-to-blade profile is changed by adjusting the strake camber line to enable the formation of expansive and contractive flow paths. Results indicate that the expansive flow path can significantly improve the total pressure ratio of the ram-rotor by altering the position of shock trains. Subsonic airflow after the shock train is decelerated and pressurized, which further contributes to the pressure rising capacity. The leakage flow is suppressed as the flow path is contractive in the blade-to-blade view. This, in turn, leads to a significant reduction of both tip leakage loss and the interference effect between the leakage and the shocks.
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