- #36
rcgldr
Homework Helper
- 8,875
- 637
rcgldr said:For an "idealized" wing, the flow is diverted, but the speed is not changed. The components of velocity are changed, the horizontal component is decreased, and the vertical component is increased (from zero to some non-zero "exit" velocity). The aerodynamic force vector points upwards (lift) and a bit backwards (induced drag). The point here is that lift induced drag is related to the diversion of flow, not dissipation of mechanical energy being converted into heat, such as friction or viscous related drag.
I updated my last post (included in the quote in this post), that might help clarify my point. In an "ideal" circumstance, Newton laws would still apply, but without requiring any loss in energy, Bernoulli principle is an example of such an idealized case where it's assumed that there are no energy losses, where a flow is accelerated as it transitions into a narrower section of pipe and decelerated as it transitions into a wider section of pipe.sophiecentaur said:I can see how the 'in vacuo' approach to this whole business leads to arguments and confusion. How is the paradox explained that air has to be deflected (along with its KE) in order to follow N3, yet no Energy is lost in the process