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Effects of a Kind of non-smooth blade on the Performance of an Axial Fan

Journal of Thermal Science 2006年第3期15卷 200-205页

作者： Hongwei MA Jibo GUO School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100083 China National Key Laboratory on Aero-Engines Beijing 100083 China

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 was measured using a 5-hole pressure probe at different mass-flow conditions. The fan performance of the groove blades was compared with that of the smooth blades. The measurement results indicate that：（ 1 ） the non-smooth blades increase mass flow of the fan at the same throttle conditions except a near stall condition; （2） the non-smooth blades reduce the relative total pressure loss in the rotor passage and increase the fan＇s total pressure rise at the test mass-flow conditions except the near stall condition; （3） Negative benefits are obtained at a near stall 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.

关键词： axial fan non-smooth blade streamwise groove aerodynamic performance.

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Effects of a Kind of non-smooth blade on the Unsteady Flow Field at the Exit of an Axial Fan

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Journal of Thermal Science 2008年第1期17卷 1-6页

作者： Hongwei MA Jibo GUO School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100083 China National Key Laboratory on Aero-Engines Beijing 100083 China

An experimental investigation of effects of a kind of streamwise-grooved blade on the unsteady flow field at an exit of an axial-flow fan was performed. The flow field at 25% chord downstream from the trailing edge at hub was measured using a fast-response five-hole pressure probe at different mass-flow conditions. The unsteady flow of the grooved blades was compared with that of the smooth blades. The measurement results indicate that：（1） the grooved blades restrain the velocity fluctuation and the pressure fluctuation by modulating the blade boundary layers, which contributes to the flow loss reduction in the hub region and in the rotor wake region at the design condition; （2） the stream-wise grooves play an important role in restraining the radial migration in the blade boundary layer and abating the tip flow mixing, which contributes to the flow loss reduction in the tip region at the design condition; （3） at the near stall condition, the grooved surface can not reduce the flow loss, even increase the loss nearby when the separation happens in the blade boundary layer.

关键词： axial fan non-smooth blade stream-wise groove unsteady flow.

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