The invention relates to a hydraulic machine through which a main flow (E) of water passes, including at least one turbine blade profile (1) having an upstream end (8) and a downstream end (10), with at least a turbulent zone, reduced-pressure zone or cavitation zone (14) being formed close to said downstream end. The machine also includes means for injecting a flow (E1, E2) drawn from the main flow into the aforementioned zone (14). The injection means include a channel (16) for drawing said flow (E1, E2) from the main flow (E) and discharging same at the downstream end (10) substantially in the direction of the main flow (E).