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首页> 外文期刊>Energy conversion & management >Leading edge tubercle on wind turbine blade to mitigate problems of stall, hysteresis, and laminar separation bubble
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Leading edge tubercle on wind turbine blade to mitigate problems of stall, hysteresis, and laminar separation bubble

机译：Leading edge tubercle on wind turbine blade to mitigate problems of stall, hysteresis, and laminar separation bubble

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摘要

Low Reynolds number flows may encounter some phenomena like stall, hysteresis, laminar separation bubble. etc., which can deteriorate the performance or efficiency of aerodynamic devices, including wind turbines. This study investigates the effect of the Humpback whale inspired leading edge tubercle on these characteristics, especially stall and hysteresis by comparing a tubercle blade with its baseline counterpart. Surface pressure measurements on various span wise locations of the blades as well as force measurement are done at Reynolds number ranging from 2.5 x 10(5) to 6.5 x 10(5). For all Reynolds numbers studied, there is a deterioration in stall angle when tubercles are introduced on the blade. The baseline blade experiences abrupt single step deep stall whereas tubercle blade experiences soft stall in multiple steps. From the surface pressure analysis, it is seen that the baseline blade stalls initially at the middle section which further progresses to the tips with increase in angle of attack. However, the stall progression to the tips is drastically inhibited for tubercle blade. It is also seen that there exists significant hysteresis loop for baseline model at all the studied Reynolds numbers. The extent or size of the hysteresis loop is dependent on the Reynolds number. This phenomenon of hysteresis is absent for tubercle blade. Surface pressure over baseline blade for a specific post stall angle of attack shows two distinct pressure distributions-one for increasing branch of angle of attack and one for the decreasing branch. Identical pressure distribution is obtained for tubercle blade irrespective of the direction of movement of blade. Clear regions of laminar separation bubble can be seen for baseline, whereas it is absent for tubercle blade.

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