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I suppose you could have lower pressure but higher velocity air behind the turbine to make the number of molecules add up.
Hi techmind... wouldn’t the pressure gradient be the other way round. If you slowed down the passage of air wouldn't it ‘bunch up’ behind?
Hi sophiecentaurThe bicycle chain analogy is an excellent one and it tells me that you are all obviously right but I still don't understand why. So what is the difference between the bit of chain before and after the the drive sprocket? If I analysed the air before and after the turbine what different properties would each have?Or to put it another way, if I built a second turbine closely behind the first, why wouldn't the second be as productive?
most of the wind passing through the swept disk is not intercepted by the blades and is unaffected.
LeeEQuotemost of the wind passing through the swept disk is not intercepted by the blades and is unaffected.The aerodynamic effect of a blade extends way beyond the metal of the blade itself. If any air gets through the turbine 'unaffected' by it then the turbine has been designed wrong and should have more blades b ecause it is missing out on some available power.
pshmellI note your 'particle' explanation, which has been popular with GCSE teachers for some years. It's all very well but very few of the particles of the air actually come into contact with the blades. The air behaves in a macroscopic way and I don't see that the microscopic approach helps. If anything, it introcuces confusion - would you really want to describe the function of an aerofoil in terms of particles?It seems to be introducing an extra layer into the problem - like introducing the behaviour of electrons when designing a simple circuit.
Interesting. What would be the actual effects on the ground?
Would that make sense? Would it be appropriate?Could you explain, using particles, in a way which would help a 'beginner', how the Bernouli Effect works and how it produces a pressure reduction. Yes, of course there is an explanation but does it help?