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- เผยแพร่เมื่อ 23 ก.ค. 2013
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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
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?
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Man...what a lesson...just spent 30 min watching a 4 min video, quality information, you have my respect!!!
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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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.
EXCELLENT DEMONSTRATION.REALLY CLEARED MY DOUBTS ABOUT FRANCIS TURBINE.THANK U SO MUCH
excellent video!
clear, to the point, helpful visuals
Thank you so much for all the team members.🙏💐
Thanku so much to the team of learn engg. For making us feel of what we study in engineering..
I worked in the original mechanical design of 2 power plants of the Calf State Water Project, Oroville and Thermalito. This brings back memories.
Quite satisfied. Extraordinary explanation!
Thanks for an amazing demonstration.
Excelente ilustração de funcionamento da turbina Francis. Obrigado!
How well explained , love this channel
very good.easy to understand while explaining along with visual.Thanks a lot.
Wow...this is very well explained. Thank you so much..I really needed this knowledge at this time of the year.
Awesome video. As a mechanical engineer I like the way this is explained. Thanks!
What is net positive suction head?
cool animation, simple explanation
simply stunning.
really good video, better explained than my Teacher XD
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...
Really awesome video !! it's really very helpful video for every engg studenst..thank u so much...
It's very nice and useful video. Clear explanation is given. Thank you.
Thank you for the video. It was very infromative.
Thank you , it was very helpful.
Awesome explanation. THANK YOU
Great video! Solved all my doubts
good thoughts with explanation for students . thank you .
what a remarkable presentation of Francis turbine
Thank you so much for making this video😇
A superb video ... Very helpful ... Thank You
Great work!
Thanks for the useful information.
Very Helpful-Thank you
thanks. nice explanation now i understood this concept.
nice explanation. thanks LE
superb explanation
Thank You very much, Very useful info
Brother thankyou very much ..keep the good work going
Thank you so much for video sir👌👌
Beautifully described
Good job brother...love your hard work😍😍
it was very helpful.. thank you
thank u so much. it is very helpful to me
outstanding explanation
Greatly explained
Video presentation is good and easy to understand..
it's really helpful.tqs for the upload
Nice animation & Explanation
Thank You so much Sir ❣️❣️❣️😊
It was very informative for me.
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.
very helpful sir.Thankyou
I felt as if i am in powerhouse and watching all the mechanisms in reality ❤️❤️.Best video ever for me. ❤️❤️🔥
Very good session thank you
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.
thank you for ur tips
Very well explained Sir
شكرا شرح مفيد 🌸
Very nice and informative video
Beautiful!!!!
That's very good informations thanks
Really helpfull for my internals because i usually dont listen to classes
It should add to your class room learning not as an alternative.
Awsome.....thanks sir👌👌👌🙏🙏🙏
Thanks deer very helpful click
very useful....
I have got clear idea draft tube and their action......
thanks everybody to support us for new learner ..........
Amazing..Thanks
very helpful
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.
thank you so much >>
nicely presented..!!(Y)
love from India sir❤
thanks a lot man
Thank you very much
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very helpful for my engineering degree ..................................
Very good and simple presentation for the beginner, I sincerely thank the LearnEngineeringTeam. All the Best.
great, very helpful !! can you make a vido explaining the design of the blades of a compressor wheel please ?
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 smoothly explained...superb work..!!👍
Thank You. Thank You.Thank You.Thank You. Very Much.
very nice very informative easy to understand: ramesh kulkarni
just awesome
My mechanical engineering staff ever... thank u respected team
thank you
Nice teacher
Excellent
Tq this is amazing v
Thank you
good work
Thank you...!!!
nice
nice and usefully
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?
tercüman arkadaşıma da özellikle teşekkür ederim.
3D made it super easy to understand
nice learning
This good video.
Very nice
Helpful for me