Working of Francis Turbine
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- Опубликовано: 24 авг 2024
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Working of Francis turbine is explained in this video in a step by step logical manner, with help of animation. Francis turbines are the most commonly used Hydro turbines. Here importance of turbine runner, runner blade shape, spiral casing and draft tube are explained.
Francis turbines are the most preferred hydraulic turbines. It contributes about 60% of the global hydro power capacity mainly because it can work efficiently under wide range of operation conditions. The most important part of a Francis turbine is its runner. It is fitted with complex shade blades. In the runner, water enters radially and exits axially. During the course of flow, water goes through the runner blades. Francis turbine blades are specially shaped. We can note that blades are having thin airfoil cross section. So, when water flows over it, low pressure will be produced on one site and high pressure in the other site. This will result in a lift force. We can also note one more peculiar thing about the blade. It is having a bucket kind of shape towards the outlet. So, water will hit, and producing impulse force before leaving the runner. Both impulse force and lift force will make the runner rotate. So Francis turbine is not a pure reaction turbine. A portion of force come impulse action also. Thus, when water flows over runner blades, both its kinetic and pressure energy will come down. Since flow is entering radially and leaving axially, they are also called mixed flow turbine. Runner is connected to the generator via shaft for electricity production. This arrangement is fitted in a spiral casing. Flow enters via inlet nozzle. Flow rate of water will get reduced along length of casing, since water is drown into the runner. But decreasing area of spiral casing will make sure that water flow is entered to runner region almost at uniform velocity. Stay vanes and guide vanes are fitted at the entrance of runner. The basic purpose of them is to convert one part of pressure energy to kinetic energy. Flow which is coming from the casing meets stay vanes, they are fixed. Stay vanes steers the flow towards runner section. Thus, it reduces inlet flow. Demand for power changes over time. The guide vane mechanism is used to control flow rate and make sure that power production is synchronized with power demand. Apart from controlling flow rate, guide vanes also control flow angle to inlet portion of runner blade. Thus, guide vanes make sure inlet flow angle is the optimum angle of attack for maximum power extraction from fluid. Low pressure at the outlet of the turbine may cause serious problems of cavitation. So, a special draft tube is designed is fitted at exit site to discharge the fluid out. Draft tube will transform velocity head to static head due its increasing area that will reduce effect of cavitation.
Thankyou so much!!☺️☺️
Thank you
Thank you
I have same runner for sale. Stainless steel Magnetic Deplux 2205.
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we can't read in books that's why we are here but you done the same ....not useful
subtitles can be used in this video
Man...what a lesson...just spent 30 min watching a 4 min video, quality information, you have my respect!!!
Very helpful for my engineering degree. God I love You Tube, there's so many mechanisms that a 2-D page just can't do justice to.
Many thanks.
And now imagine the teachers really think they will teach it just by talking and drawing on chalkboard.
How'd the degree go? What's life like 8 years after commenting? I'm just about to finish my Eng degree and can't fathom what life will be like in 8 years lol
@@davidsimon665 so what's life like after 6 months?
@@forloop7713 so what's life after 4 months?
@@juliuscaesar564 so what's life after 5 months?
Great animation. It's insane how they have up to 95% efficiency.
totally agree to the comment of the XBuryBoy, by seeing this animation maake me instantly understand the working of the Francis engine than reading the two pages on my course book. Thank you Learn engineering
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I worked in the original mechanical design of 2 power plants of the Calf State Water Project, Oroville and Thermalito. This brings back memories.
really good video, better explained than my Teacher XD
No.
Some popular science explanation is need..
The draft tube gradually widens in area and slows the fluid down before it exits. Slower speed means something has to hold the horses back and the only way that could happen is a pressure gradient. Each tiny flow element will have to feel an external net force reducing its speed.
The only way to have a net force that affects speed is to feel more pressure on your face than on your back. As the first guy exiting the draft tube enters free air with his "face pressure" only defined by the water depth of exit, the gradual pressure forces will pile up like in a battery stack and you will have the minus pole of the pressure gradient sum at the inlet of the draft tube.
So the draft tube is a pressure battery stack driven by kinetic energy and introduces much wanted reduced pressure at the turbine exit. A side effect is any factor of cavitation will increase.
If the design is subject to cavitation you can add static pressure to the turbine by placing it as low as practically possible, sometimes located far below the water level of the exit.
Awesome video. As a mechanical engineer I like the way this is explained. Thanks!
What is net positive suction head?
Really helpfull for my internals because i usually dont listen to classes
It should add to your class room learning not as an alternative.
Hodgson Water Mill in Sycamore, Missouri is a great example of early use of the Francis Turbine. Built in 1894 by Alva Hodgson, the grist mill used not one, but two francis turbines to power the facility.
outstanding explanation
what a remarkable presentation of Francis turbine
love from India sir❤
EXCELLENT DEMONSTRATION.REALLY CLEARED MY DOUBTS ABOUT FRANCIS TURBINE.THANK U SO MUCH
Wow...this is very well explained. Thank you so much..I really needed this knowledge at this time of the year.
I feel like this entire video’s script had all of its instances of the word “the” removed.
Good job brother...love your hard work😍😍
Video presentation is good and easy to understand..
It such a more help full for me to better understand that how its work and what mechanism should be helps to rotates the runner.
Thank you very much...
Very nice and informative video
I have got clear idea draft tube and their action......
thanks everybody to support us for new learner ..........
Woww
Great video! Solved all my doubts
Really awesome video !! it's really very helpful video for every engg studenst..thank u so much...
My mechanical engineering staff ever... thank u respected team
Nice animation & Explanation
Thank You so much Sir ❣️❣️❣️😊
excellent video!
clear, to the point, helpful visuals
Wow! Very well explained. We presume the voice is that of a robot as the grammar is quite different and appears to lack continuity. Thanks for the video and best of luck.
very good.easy to understand while explaining along with visual.Thanks a lot.
It's very nice and useful video. Clear explanation is given. Thank you.
very helpful for my engineering degree ..................................
Quite satisfied. Extraordinary explanation!
Thank you so much for all the team members.🙏💐
thanking each and everyone who worked to develop this video .
Thanku so much to the team of learn engg. For making us feel of what we study in engineering..
Very well explained Sir
Thanks deer very helpful click
3D made it super easy to understand
Very well explained. I was so much confused between Guide vane and Stationary vane. Also was confused about its flow. Thanks for this awesome video.
This is great. Maybe you could reuse the model to illustrate the Leffel Turbine which I think adds an axial flow stage below the Francis Turbine.
Excelente ilustração de funcionamento da turbina Francis. Obrigado!
Nice teacher
Beautifully described
Very good and simple presentation for the beginner, I sincerely thank the LearnEngineeringTeam. All the Best.
cool animation, simple explanation
simply stunning.
superb explanation
How well explained , love this channel
It was very informative for me.
very nice very informative easy to understand: ramesh kulkarni
Brother thankyou very much ..keep the good work going
A superb video ... Very helpful ... Thank You
Awesome explanation. THANK YOU
Very good session thank you
thanks. nice explanation now i understood this concept.
Thank you so much for video sir👌👌
Greatly explained
Me with my fear of dams, watching this and thinking about what would happen if a person passed through this. Also, thinking about what the likelihood of surviving this would be. I know people have gone through turbines and lived, but I also know that they were only a few out of the many.
The reason why guide vanes closing impact flow rate is the back pressure
The pressure difference between Dam water level and guide vanes is what governs the flow rate, if guide vanes are closed then the pressure difference between guide vanes and water level goes down causing the flow rate to go down
Thank you for the video. It was very infromative.
Thank you , it was very helpful.
Thanks . Now I now how it works .I see some improvements can be made . But for now in 2019 it will be fine .
of course.. so what are the improvements you can see?
Thank you so much for making this video😇
Thanks for an amazing demonstration.
nice explanation. thanks LE
I felt as if i am in powerhouse and watching all the mechanisms in reality ❤️❤️.Best video ever for me. ❤️❤️🔥
Super explaination but I need to know in deep and very keen information from point to point how turbine is been prepared and which type of material is been used
Excellent
Thank You. Thank You.Thank You.Thank You. Very Much.
good thoughts with explanation for students . thank you .
nice learning
Thank you
Thank You very much, Very useful info
Great work!
Interference runner got stuck when installing waiting for gugler to give advice on pulling back off and see if gasket blew out
Very Helpful-Thank you
Very nice
thank u so much. it is very helpful to me
This turbine is the same used in the Itaipu Binational Hydroelectric Power Plant
Traducir al español
That's very good informations thanks
very helpful sir.Thankyou
now attach a second francis turbine to the Draft Tube!
**Claude-Louis Navier wants to know your location**
it was very helpful.. thank you
Lesics know using articles waste of time! Lesics not need articles, only 3d animation, not waste time, more engineering, great success!
Thanks for the useful information.
Hello?
I want to use the scene where the turbine rotates for 10 seconds for non-commercial use.
I would be very grateful if you would allow me.
Thanks
How you have created this animation?? Nice content amazing
I also want to teach my students like this in our college.
The problem is that what so called Guide Vanes will also reduces the velocity of the flow due to the friction and change in the direction of the flow. So the gain in energy relating to that could be small or nothing.
very smoothly explained...superb work..!!👍
it's really helpful.tqs for the upload
great, very helpful !! can you make a vido explaining the design of the blades of a compressor wheel please ?
Draft Tube increases the effective head on turbine. It has got nothing to do with cavitation ,period!
NAUSHAD AHMED
Sir it may increase cavitation on exit side
Why abd how people think dislike this type of videos 😈😈😈
Thanks to share your best knowledge and one question I want to ask you u how lift generation in vanes due to its aerofoil shape
very helpful
شكرا شرح مفيد 🌸
super video
Çeviriyi yapan Özlem Çevikbaş'a çok teşekkür ederim.
Thanks a low, great explanation
If only it was good on the open road after fixing the car wheels recharging your ev battery as speed = more power as it turns the Tribune recharging air filter system faster as you need an air to water converter box like on that drinking machine to get a new car or jetliner ev self sustainable ev battery recharging system.