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Drag & lift force calculation

03/14/2010 1:34 AM

hi, friends m rajesh,i m doing project on wind turbine for my last year of engineering degree.I m using unsymmetrical airfoil.So 1) how to find lift & drag force.If possible elaborate with diagram so i can understand better. 2) angle of incident & attack in case of wind turbine having airfoil cross section of blades? 3) how to find lift & drag coefficient in case of windturbine?What is use of lift & drag coefficient? 4) what is coefficient of drag & lift for airfoil element?

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#1

Re: Drag & lift force calculation

03/14/2010 10:03 AM

As an engineering student, you must realize that it is and will be up to you to know how to dig and find this out,

I did a quick google search and found answers or at lease enough information to extrapolate the answers without even picking up a text book. that even a 3rd or 4th year engineering student should be able to.

You need to know the fundamentals, if your struggling, with the information you gave, this is the best I can do to help you.

p911

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#2

Re: Drag & lift force calculation

03/15/2010 7:28 AM

God forbid you go and ask your professor...

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#3

Re: Drag & lift force calculation

03/15/2010 11:06 AM

I suggest that you find a decent aeronautical engineering textbook, open it up and start reading it. Only then you'll find the answers that you need.

This is basic Aeronautical Engineering 101....

Good luck!!!!

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#4

Re: Drag & lift force calculation

03/15/2010 12:10 PM

Those of us who served our time in engineering school in the 60's did not have the internet, forums like this, and other modern sources of information to utilize. We had to go spend many hours to research our assignments in the engineering library and the rewards were great, i.e. not only being able to fulfill the assignment, but to learn other facts peripherally and learn the regimen of research as well. In fact, during my time there, we didn't have personal calculators beyond the ubiquitous slide rule, which I pull out from time to time to both see if I can still use it and to reflect on the gratitude that modern conveniences have brought to the engineering profession.

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#5
In reply to #4

Re: Drag & lift force calculation

03/15/2010 12:22 PM

When I went to college they say the way to disquish the old school engineer from the new school one is;

The old school does his work with a calculator and then checks it by hand.

The new school one does his work by hand and checks it with a calculator.

I like to add a third from what I have seen

The modern one (graduate in the past 10-15 years.) runs a program and lets (hopes) someone else checks it. Because the modern one pressed all the right buttons.

p911

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Guru

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#6

Re: Drag & lift force calculation

03/16/2010 9:03 PM

How about this:

Once you know the answers to these questions (all of which you should know already as a senior) and once you need specific feedback on your design decisions, stop back.

You might also propose answers to some of these questions and run them past us. For example, what do you think the use of lift and drag coefficients might be? Explain such things to us, and we can provide feedback.

We don't do homework.

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