Have not gone through you video yet. But thank you very much for sharing this method. This is exactly what I am looking for! I used to work for a wind turbine company and always wondered how the bladed is designed according to fluid mechanic and wing theory.
I was looking at turbine blades, from a company unnamed, they has 3 different lenth blades, the only difference between the 30" and 48" was the 30" were cut off from the 48", I don't think that will make a effiecent blade! It makes the tip near 3x wider on the shorter blades!
Thanks for this excellent explanation, can you give the name of the books you referred for this? Because I have been searching for step by step approach like this, but most of the books are filled with theories.
Thanks for the explanation, however, you want the turbine to produce 5 MW with a radius of 80 m and a wind speed of 8 m/s which gives a power coefficient around 0.8 which is impossible where the theoretical limit is 0.59 (Bet'z limit). I think with these values you can have a maximum of 2.5 MW.
Einstine designed my 2 blades opposing there opposite halfs and predicted frictionless magnetic bearings in learning curve in left corner unrecognized as pure wind source only opposed by thin 0 value edges.by betz law
Great video, mate! I would like to ask for the source of knowledge you used here. I really need to look into greater detail however, it's difficult to find a convenient source that would explain everything in simple words. I am trying to find a sort of a step-by-step guide about wind turbine design. Thanks again for the video :)
1. Betz limit and efficiency of wind turbine 2. TSR and effect on Cp cdn.intechopen.com/pdfs/16242/InTechWind_turbines_theory_the_betz_equation_and_optimal_rotor_tip_speed_ratio.pdf 3. Airfol selection , I use NACA 4 and 6 families, for root you use "fatter" airfol because of strenght airfoiltools.com/airfoil/details?airfoil=naca4412-il 4. Twist angle and distribution(video above just take wind speed on blades as 2/3 of wind speed in front of blades) 5. chord distribution, in Betz theory it is described by this equation(which needs optimatization but it is good for the beginning) c(r)=(16*pi*R)/((9*n*Cl*TSR* sqrt(TSRr squared +4/9)) R radisu of blade r local radius n number of blades TSRr local TSR 6. Material strenght, i dont know on what are you working but best materials are fiber glass and composites of fiber glass Once you define geometry of your blade I recommend building it in solidworks and printing it, than you can create mold and then more blades, or you can create your mold in solidworks as well. I hope i helped you, lets build this turbines and help our planet!
Video is really great, but I am not getting the moment 485.3 KNm , Is it possible for you show in the video how you are getting that value , it will be great help for me and I really appreciate it.
I haven't tried it, but I guess when the radius (r) changes, the gamma angle also changes. Hence the Moment (M prime) is also changing. So the total moment turns out to be 485.3 kNm. How the gamma angle changes is shown in the video.
Your lesson is great it gives simple explanation of wind turbine twist angle, but you did a mistake in the beginning. The whole point of wind turbines is to take kinetic energy from the wind and convert it to electricity and to do that turbine has to slow down the wind. By Betz theory you get good aproximation of twist angle if you take that wind speed on the blades is 2/3 of wind speed in front of the turbine. Once you get this twist angle you have to do the optimatization using computer programs but for the beginning Betz theory is good. Also it works for TSR from 6-9, airfols with low drag and at the root of the blade it does not give good values.
Awesome video! Can you share your values for M'2 thru M'5? I'm building a spreadsheet based on your calcs and am with you right up to M'=1764 Nm/m but am getting 642 kNm for the integrated moment on a single blade. Making sure I'm using delta r and everything, can't find my mistake. Hate to drag you back to something you did so long ago but am working on an educational video and want to make sure I get this right. Love what you're doing, you deserve more subs! (fellow engineer BTW, dipping my toe into wind turbines).
A waste of cyper space big unessesery gaps leonardo wagon goes by ship at sea design 500 + years old oil discovery embedded It 1919 for slush fund to elect polices.obviously the 100 + year politics old scam in play still just .barely.
Say please consider betz totally fake focus on 1905; Einstines relativity kinetics has blue print to stop cold global warming as well as props losing most of winds and tides values in propelling ships to in 1 rpm my design of equal and opposite reactions is able to be enclosed threw cylinders for over majority of cycle or more 6 times opening and releasing either way far more usable kinetic energy thanks if sketch helps let me know or RU-vid bejesus windmills or automatic feathering flat blade radial windmills drawimgs bigger than hover dams that reverce in tides and winds need creditability lacking in sciance thanks I am just inventor way under Einstine
Thanks, Postcard Professor...Just wondering if you have ever done calculations for the VAWT design turbine? To me it would appear to have 2 major advantages over the typical blade design. 1] it does not require a 90º gearing for power differential, 2] it can use wind from all directions.
U're a genius bro! Just one thing has been in my mind for the past couple of months... how can i determine the W or the RPM of my shaft or my wind assembly ????? I really need this
It's something you choose. One constraint is that you never want your blades to get too close to the speed of sound, so (omega*R should be significantly smaller than that). If you want to dive into the world of electrical generators, there may be some additional constraints there. A final constraint would be from the structure, where you have stresses develop based on the centrifuge effect (omega^2*R). Good luck!
@@PostcardProfessor How can i chose that ? if i know that the speed of the wind (8m/s let's say), the RPM will vary and increase with the increase of the velocity of the wind. i wanna know if there is an equation that relates the 2 together (maybe also in relation with the radius)
@@ing.anthony7097 You can couple the moment of the wind turbine to a model of your generator. If you know that the generator accepts a torque that is dependent on the RPM, then you can calculate the operating point of the system. Alternatively, you can put a brake in the system that will keep the turbine operating at a steady RPM, and use up any excess torque. If you want to determine WHY the RPM is what it is, you need to start looking at the mechanical systems, rather than keeping to the aerodynamic.
@@PostcardProfessor hmmm. so if i am designing a wind turbine with 29m radius and w speed of wind 8m/s... is the RPM of the turbine shaft evident here ?
@@ing.anthony7097 Constraining the tip speed to less than some percentage (say 70%) of the speed of sound gives you a maximum value, but there's not a single clear answer from the information you've given.
I haven't tried it, but I guess when the radius (r) changes, the gamma angle also changes. Hence the Moment (M prime) is also changing. So the total moment turns out to be 485.3 kNm. How the gamma angle changes is shown in the video.
Thank you Sir for this video very informative. I have a question despite that. Indeed in certain cases the chord of the blades are variable along this one. In this case, what do we do? choose a value or calculate a value of the string in each case. And what would be the equation for calculating these values of the chord?
Typically, the exact details of the chord variation are due to structural constraints (how much bending can each section handle). This analysis can only tell you how much power you'll generate once you choose the chord variation.
Would you be interested in helping me design a tiny wind turbine generator for off grid? For ultra low wind speed, but needs to survive 80 mph, but make power at 5mph! Do you think you could design to meet these wind limits ? I am moving to off grid, and need to supliment my solar power, and I'm thinking 1kw in 25-30 mph wind, are you interested? Thanks
This is ideal in multiple ways. Probably the most important is the neglect of 3D effects. We assume that the flow for each cross section doesn't change that of the adjacent cross sections, and there is no radial flow (flow along the length of the blade). Mechanical losses are also neglected, but much more easy to add in (if you have the efficiencies of the gearbox, etc.).
Very different, unfortunately. Darrieus wind turbines could probably be designed somewhat similarly (with additional complications), but Savonius would be nearly impossible.
@@PostcardProfessor What is your take on the #Saphonian. Postcard Professor, and also I'd really like to get a response to my VAWT question above. Much appreciation!
