Er hat bereits Anfang 2020 mit der Entwicklung eines modernen Profilstraks für F3f begonnen und alles in einem umfangreichen Bericht zusammengefasst. dat files: Optimized Wind Turbine Blade Design using QBlade.ģD Printed Wind Turbine Blade Design - YouTube PlaylistĪuf RC-Network wird im Laufe der nächsten Woche die Entstehungsgeschichte des F3f-Modells “V-JX” in Form eines mehrteiligen Berichts veröffentlicht werden.ĭie aerodynamische Auslegung des V-JX stammt von Jochen Günzel. 4.8, the new airfoils produce L/D’s that equal or exceed those of previously existing low Reynolds number airfoils applicable to HAWTs.įor designing your own wind turbine blades, which I was looking into, QBlade seems to make sense. Such performance penalties, however, are typical of most low Reynolds number airfoils. As a consequence, the SG6040 - SG6043 series of airfoils have fairly high pitching moments (−0.08 < Cm,c/4 < −0.14).Ĭoncentrating on baseline airfoil performance, penalties owing to off-design conditions are relatively small except for Re ≤ 100,000 where laminar separation effects cause large increases in drag. However, owing to the high design Cl’s, the shallow upper-surface pressure gradients needed to produce low drag lead to aft-loaded airfoils. For all four of these airfoils, it was desired to keep drag near the design lift coefficient as low as possible. The root airfoil was designed to operate at Cl = 1.1 for Re = 200,000 making it suitable for use over the inboard 30% of the blade. The primary airfoils were designed to achieve as high an L/D as possible for 0.6 ≤ Cl ≤ 1.2 with 250,000 ≤ Re ≤ 500,000. Several other design constraints were imposed on both the primary and root airfoils. Additionally, a 16% root airfoil (SG6040) was designed to accommodate possible large root bending moments and large blade-stiffness requirements. Considering the low operating Reynolds number and beneficial centrifugal stiffening effects of small HAWTs, the thickness of the primary airfoils (SG6041, SG6042, and SG6043) for use at the 75% blade station was fixed at 10%. To fill this niche, a total of four airfoils were designed for use on 1 − 5 kW rated power wind turbines.ĭuring this design effort, the focus was to create a series of airfoils that could be used along the entire span of small variable-speed wind turbine blades. There are, however, only a limited number of wind-turbine airfoils designed exclusively for wind turbines with small blades. For example, the advanced NREL airfoils such as the S822/S823 documented in Volume 1 and 2 provide both aerodynamic and structural advantages as compared with the myriad of aircraft airfoils adapted for wind turbine use. SG6040, SG6041, SG6042, & SG6043 Over the last 12 years a considerable number of airfoils have been developed for HAWTs. Not related to your comment, but clicking through the references gets you here for example: UIUC APA - LSATs Airfoils Tested and then test data and commentary for the SG6040 airfoil, which I noticed is thicker than most of the rest: įor AWE I guess the sailplane airfoils make most sense to look into, or perhaps the thicker ones for their strength. Aside from that, of course I could watch that sort of stuff all day, but have other things to do. This is funny, and it leaves the door wide open for people who CAN explain how it works to do so. This is the problem with “science”: Outdated wrong explanations live on, enjoying habitual and unquestioning “legitimacy”, while in reality, with wings being used all over the world for over a century, “science” still can’t explain how they work. Calculations alone show that air velocity alone cannot produce sufficient low pressure to explain the amount of lift generated by an airfoil. Only thing is, like I saw David Attenborough do in another video about pterosaurs, he just recites the Bernoulli myth that “the reason” for lift is faster air on the top surface. Oh yeah, I was paying attention - some nice stuff. He gives short and very clear overviews of the relevant theories applicable to his research and shows the results of his and others’ experiments.
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