How to Calculate Wind Turbine Power Output: Blade Element Momentum Method

[@aiaiai4706]

Brilliant video, getting into this topic for my thesis on blade analysis in a tidal application, this all still applies there!

[@pedros643]

Great video, helped me a lot to understand this topic. Cheers!

[@CosmosamLearns]

Great video ma'am! It provides concise but mandatory information of wind turbine blade design theory. Appreciate your effort in making all these videos✨.

[@wuhongxin_wind]

To be honest , Your smile is really healing. I like it.😁

[@Salmaganawa001]

Thank you for this great video, can you suggest a method for analysing Savonius wind turbine please

[@yungrabobank4691]

Very concise. Nice

[@EngineeringwithRosie]

Glad you think so!

[@brunobouyssounouse562]

Great tutorial ! I’m looking for practical info on how to measure the energy output of a wind (or other energy producing) turbine. Things like how to choose the type and power of a generator, and how to hook it up with a measurement device. I know almost nothing about electricity. Thanks so much !

[@iarnaldo]

Thanks for your video, greetings.

[@serafeimb.727]

Great video! I fully understood BEM theory thanks to you. Im an undergraduate student in engineering and i have to design and calculate the efficiency of a hydroturbine. I was wondering if BEM theory could be applied there? Any suggestions or suggested papers are appreciated!!!

[@EngineeringwithRosie]

In theory yes but you will need to check that all the assumptions and simplifications in BEM are reasonable for hydro. I have never worked with hydro, so I have never made those checks.

[@arasimaharajan2580]

Please post a video on turbulence generation using active grid protocols

[@AbdulhakeemMSumandar]

very nice discussion ma'am, how about the savonius wind turbine? can you make a video. thnkx

[@robbiejames1540]

Hi Rosie, One quick question - is generation of tip vortices accounted for in the calculation of CL and CD for Blade Element Theory (with something like Lifting Line Theory), or is that not possible?

[@prospertwizeyimana8615]

Great work, In the video you mentioned that you can't use the BEMT to determine the optimum number of blades. But you also mentioned that this theory is good enough for the preliminary design of major blade geometry parameters including the number of the blades. Kindly clarify this. Thanks Prosper

[@jakobgebel6332]

kzbin.info/www/bejne/pWeldKGeqseVn7M because in a 3 bladed turbine each blade does not affect the next one that much, zhus the overestimation of BEM (hich cant account for that loss) is relatively low. but if you would add 300 more blades, (which would obviously be insane) this model would think you have 100 times more thrust and torque, as it doesnt "know" the blades can affect each other. it always assumes perfect flow for all blades

[@khalildeghoum]

thank you so much. I want to know are you have a program Matlab for BEM?

[@EngineeringwithRosie]

I normally just use an Excel spreadsheet and copy paste to iterate the flow factors until it converges. It is very fast and cheap, I haven't had Matlab since I left uni. This book has some Matlab codes that come with it I believe: www.springer.com/gp/book/9781849961745 I used them years ago and they were a bit buggy so make sure to check if you use them.

[@fauxaccount6233]

Hi. Can you make a video about power electronics in wind turbine? Thanks for the information, I really appreciate it

[@EngineeringwithRosie]

Hi, I have some ideas, but I need to find an electrical engineer to collaborate with (I'm a mechanical engineer), so it might take a while before I get any like that up on the channel. What topics are you most interested in? Thanks for the suggestion and thanks for watching!

[@fauxaccount6233]

@@EngineeringwithRosie I would like to know the topologies and the advantages and disadvantages of each one from the point of view of power quality. I think it's a very interesting topic given that wind is not always constant and power electronics often can introduce harmonics distortions to the grid.

[@rhn9847]

Can you make a video about VAWT? its aerodynamics and how a deflector increase its efficiency?

[@burhanahmed2978]

Hi Rosie. I am designing a H-rotor VAWT but I am difficulty coming up with best dimensions for the blade. any suggestions??

[@EngineeringwithRosie]

Hi, I would suggest starting with your requirements (how much power do you want to produce) and your wind resource. Then that should get you in the right ballpark for sizing. Next I would choose based on what the standard sizes are for the critical components you need. It will be much cheaper, easier faster and more reliable if you can get as much as possible off-the-shelf. If you plan to build your own blades, this might mean thinking about how much space you have to get equipment in and out of your workshop, what standard lengths timber comes in if you will build a frame or mould, stuff like that. Good luck and please let me know how you go with your exciting project! By the way I am working on a video on VAWT design theory, but it is still probably a couple of months away.

[@chatwo6595]

Hi Rosie, very nicely explained....Can you explain what are the main structural( Harmonic , constant etc..) loads at the top of the tower in a stready operations....i mean if u remove blades nacelle and represent it with with structural loads at the top of d tower, what would be those..thank you very much...

[@shudipttashuvro8950]

Hi Rosie, Could you please help me, how to work on the feasibility study of 1MW wind turbine to H2 production? How do I start? Thank you ❤️

[@prayagvv3063]

Can you make a video on effects of aerodynamic damping on offshore HAW turbines

[@EngineeringwithRosie]

Hi, thanks for the suggestion! I am not going to be able to make that video, it is a bit beyond my field of expertise sorry 😬 I was trying to find a video from someone else that could help you instead, but I haven't had much luck there either. If you could tell me a bit more specifically what you are looking for then I will have another try. Is it the concept of aerodynamic damping itself you want explained? Or its affect on turbine design? And if it's turbine design, which aspects specifically?

[@prayagvv3063]

@@EngineeringwithRosie Could you explain the concept of Aerodynamic damping in case of wind turbines? And how does this affect the fatigue loads on the tower?...It will be very helpful if you could clarify all these...

[@EngineeringwithRosie]

Ok, I will see if I can find someone to interview on this topic!

[@THEBLACKSMITH530]

Amezing mam i love your teaching thanks 🙏🏻

[@rashiraguram1212]

yes you are an engineer congratulations

[@fanatamon]

Good vid thanks, just a question which is of some difference to the topic in this video what is a good fan or blade design for a constant 5m/s wind speed.

[@tgdomnemo5052]

Thx again, Mam ! You really are a great teacher 🙏🏼 How much i would have enjoyed to be a pupil in your physicsclass ! ... well, somehow i am. 🤗

[@rondavison8475]

is there a fudge facto for 2 and 3 bladed BEM for comparing wake % differences? I would think two has next to zero interaction, 3 a little, but not bad, and 4 & 5 blades the hit is exponentially bigger. Is the optimum number of blades pie? :)

[@mattm32]

Hi Rosie, Thanks for the content. What is the app you r using for the simulation of the turbines

[@demyankor3401]

Hi Roise. Im design engeneer, and I m going to build HAWT with diameter 24 m. Wich aerofoil are U recomended TSR 4.5. Power output 20kwh. For BEM modeling and optimisation i use Qblade. Can U recomended softwere for design Hawt. Thank U for video and reply.

[@EngineeringwithRosie]

Hi Demyan, wow that is a big turbine to be making on your own! The aerofoil will need to be chosen based on a lot of factors unique to your design, so I can't tell you what will suit you best. Don't forget structure and manufacturing, they will be just as important as aerodynamics when you're choosing your blade geometry. And you don't need to use the same aerofoil along the whole blade. Your size is in between "small" turbines (~50kW) and utility (MW scale), so you might find it hard to get an aerofoil for that size. I would suggest looking at research published in the early 1980s, when 20kW was utility scale. Try Sandia, NREL maybe universities like DTU or Delft, they might have published aerofoils youcould use. If you need to use aerofoils from much larger or much smaller turbines or aeroplanes then don't forget to calculate your Renoylds numbers because if yours is very different to what the aerofoil is intended for, you won't get the expected performance. And can you tell me what software you are looking for? You have Q-blade for the aerodynamic design, do you need 3D modelling software or something else?

[@demyankor3401]

​@@EngineeringwithRosie Hi Rosie. I started my personal project couple month ago with mixed success. In my job I'm using autodesk inventor but it doesn't help(. Сoncerning to aerofoil I picked up NREL aerofoil S821, S819, S820, and in Qblade i calculate an optimum rotor, Cp, Torche, Thrust, bending moment. But I can't simulate 4 blade rotor with unusial inner structure in that aeroelastic tool. I understand that I need some CAD. Curently I know 2 programs - Qblade (2 moth of exp) and Ashes (2 days ). So I want to find some simple tool for calculating wind thurbine and rotor optimisation. As U writed above aboute Re nomb of current section of aerofoil I understan that. But I dont know where I can get 360 der aerofoil polar? X foil simulate in -25 deg + 30 deg. And eventualy I realised that it is experemental data or it is CFD computed data? Can u give a clue?

[@klgm100]

At 0:54 you said the drag is opposite to air flow but in the sketch its in same direction.

[@postingskyline.r34]

I really love your videos and they help me understand for my school project. However i got a problem that i don't know what to do. in my project i have to pick one one blade design, test its efficiency then create one by myself so it would have better efficiency than the one that was already created. also i will need to 3d print it. Any ideas or suggestions? Would help very kuch thank you so much again.

[@rudbiti2]

Great video :) What's the name of the software you use for wind turbine simulation?

[@EngineeringwithRosie]

Hi Alfred, thanks 😀 The software is called Ashes, you can find it here: www.simis.io/

[@rudbiti2]

@@EngineeringwithRosie Thank you very much! Keep it on with the videos ;)

[@meeptothemax375]

​@EngineeringwithRosie I tried the software, but it requires an obscure RAR unzipper. I downloaded it, but it does not seem to work. Did you have any problems with this? If the simulator does not work, is it possible to do BEM by hand?

[@madtscientist8853]

So could B.E.M calculate the vortex and or the energy output of a archimedes / golden ratio turbine. That has a Diameter of a 100 Feet and 75 feet in length. I think not.

[@waldsonmelobezerra2298]

Hi, thaks very good videos. Can you make a video about Wind Turbine With Diffuser and yours effects ? Compare B.E.M

[@EngineeringwithRosie]

Great suggestion about diffusers. But what do you mean by "yours" effects? Is that a typo or perhaps something I don't know about?

[@waldsonmelobezerra2298]

@@EngineeringwithRosie Sorry, Is that a typo . Effects Wind Turbines with diffuser and method BEM for wind turbines with diffuser.

[@waldsonmelobezerra2298]

And, calculate Power Coefficient wind turbine with diffuser, for example.

[@aparchitransh9848]

how we calculate the ice prediction thorugh BEm

[@danaharrington6561]

Is this same math used for VAWT?

[@rondavison8475]

I do not think so. Just trying to think about making some simplifying assumptions blows my carbon based simulator to bits of dust. wind normal to rotation allowes many clean assumptions and things like 1 dimensional math with a radial slicing as described.. VAWT everything everywhere is always changing. lots of crunching.

[@hetbhavsar4902]

It's very informative ma'am. Which software was used to demonstrate the effects of wind on turbine blade in this video ma'am?

[@hetbhavsar4902]

I was just browsing through comments and I got the software link, thank you.

[@RebeccaEvans]

Appreciated

[@waledaboaresh7657]

Is drag opposite to direction of wind flow or in direction of wind flow ?????😇

[@tarikumessele1304]

very hel full tnx

[@EngineeringwithRosie]

Welcome

[@kaursingh637]

very good =excellent =please suggest a book on aerodynamics =amarjit=delhi=india

[@davidwilkie9551]

Good Engineering Review

[@gman21266]

@Engineering with Rosie -- Are you available for freelance work ? If not, is there someone you can recommend to me?

[@EngineeringwithRosie]

Yes through my company Pardalote Consulting. And if it's not something we can help with I can recommend someone who can. Can you send a message through this form? www.pardaloteconsulting.com/contact

[@gman21266]

@@EngineeringwithRosie - I filled out the form a few days ago, but I haven't received a reply. ??

[@EngineeringwithRosie]

@@gman21266 can you check again? I did reply

[@MichaelMachado2]

More like this

[@QMCESAR]

Great videos and very good explained. Just get a better microphone to appreciate better your voice. Thanks a lot. :-)

[@EngineeringwithRosie]

Thanks for the tip! A new microphone is top of my list of improvements to buy 😀

[@ajeesh3485]

gravity has no effect on the rotation of this blades?

[@sathwickris]

Lift acts perpendicular to the relative wind.

[@rondavison8475]

relative = tip speed + wind speed

[@WarblesOnALot]

G'day Rosie, Cards on the table... My first Aeroplane May be seen in, (Title-searching YT...)... "National Transportation Museum ; Visiting My First Aeroplane...!" Regards my second Hairygoplane..., In it I Made the (Coveted) "Maiden Flight" of a New Prototype..., After I'd redesigned the Wing Trailing-Edge Section Profile..., & The Undercarraige (Substitituting a floating Bungee-Sprung Cross-Axle, instead of a welded rigid triangulated 4130 Chrome-Molybdynum Tubular Structure...), & The Wing Leading-Edge, (replacing the Dacron/1.5mm Styrofoam/Resin "Foam/Fibre 1/2 Sandwich" Hypothesis, With 1 mm 2124 Aluminium Sheetmetal...). And, also, after Designing & Fabricating & Fitting An actually Streamlined Fudelage-Pod..., Around the Cockpit... And after having Flown behind Two of my own Hand-made, Home-designed Laminated Carved Propellers, As well as having spent 20 years trying to Design a Micro Wind-Turbine to be as Cost-Efficient as a Solar Panel...(!). I started raising my own Kids on Kerosene Lamps, & Candles In the 1990s. Because Solar Panels were That pathetically Bad..., And Windmills were Worse.... Thirty years down the track, And both my kids and myself Live Off-Grid Using Stand-Alone Solar Arrays, Batteries, & Inverters... With NO Connection to the Fossil-Fooled Grid....(!) Yuck Fou...; Grid- Enslaved DimyDamnDumbPricks&Twatz... Just(ifiably Sayin'...) ! Such is life, Have a good one, Stay safe. ;-p Ciao ! My BIG OBSERVATION... Is that Betz' Law Is An EQUATION. It ASSUMES 100% EFFICIENCY..., At Converting Rotational Shaft Speed Plus/minus/multiplied/or divided by "Torque"..., (ie the "Twistiness"..., Encountered within Yonder Shaftings... !)

[@ME-rv1pw]

"You can't use this theory to determine what is the optimum number of blades for a turbine" "It's definitely good enough for preliminary design of ... the number of blades" hmmm

[@Joorin4711]

It's all about making iterations and as quickly as possible stop exploring something that has low or no potential. After having found something that looks promising it's time to spend more time and energy (money) to refine that idea with, for example, more complex analysis. The two statements you quote are not in opposition to each other since finding the "optimal solution" relies on later, and more expensive, steps in the process.

[@danielvaldetaro1421]

Rose seems such a happy girl

[@jugglinglessons]

Geek treats😁🖖

[@jackybenon]

Bonjour Rosie, j'ai un projet de construction d'une éolienne verticale, j'ai un modèle de générateur de 3 kw, une vitesse moyenne de vent de 5m/s je cherche la meilleure conception de pales. Après réflexion je vais essayer de monter 12 pales sur 70 cm de hauteur espacées de 50 cm de l'axe avec une inclinaison de 3 cm, avec un 2e étage dont les pales seront intercalées avec celles du dessous. Penses-tu que ma voilure sera suffisante ? ou dois-je revoir ma copie. Je te remercie d'avance pour ton écoute.

[@prettysmartyvibes]

Hi.. the explaination is not clear

[@TheSaint135]

The volume on your videos it's too low