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This paper presents an experimental investigation of effects of a kind of streamwise-grooved blade on theperformance of an axial-flow fan.The flow field at 25% chord downstream from the trailing edge at hub wasmeasured using a 5-hole pressure probe at different mass-flow conditions.The fan performance of the grooveblades was compared with that of the smooth blades.The measurement results indicate that:(1)the non-smoothblades increase mass flow of the fan at the same throttle conditions except a near stall condition;(2)thenon-smooth blades reduce the relative total pressure loss in the rotor passage and increase the fan’s total pressurerise at the test mass-flow conditions except the near stall condition;(3)Negative benefits are obtained at a nearstall condition when the smooth blades are replaced by the non-smooth ones.The fan mass flow decreases 0.9%while the total-pressure rise decreases 2.4% at the near stall condition.
This paper presents an experimental investigation of effects of a kind of streamwise-grooved blade on the performance of an axial-flow fan. The flow field at 25% chord downstream from the trailing edge at hub wasmeasured using a 5-hole pressure probe at different mass -flow conditions. the fan performance of the grooveblades was compared with that of the smooth blades. the measurement results indicate that: (1) the non-smoothblades increase mass flow of the fan at the same throttle conditions except a near stall condition; ( 2) thenon-smooth blades reduce the relative total pressure loss in the rotor passage and increase the fan’s total pressurerise at the test mass-flow conditions except the near stall condition; (3) Negative benefits are obtained at a nearstall condition when the smooth blades are replaced by the non-smooth ones. the fan mass flow decreases 0.9% while the total-pressure rise decreases 2.4% at the near stall condition.