Power/Aerodynamic?

Question

please explain the relation and what they mean.
how is it created?
where is it created?
etc....

Answer 1

Air as you may very well know is considered a fluid like water and any other liquid. When that air moves and becomes in dynamic state, it produces power that can destroy a whole city. You most probably have heard of cyclones. A cyclone is very much the same as a tornado, except the area about which the air rotates is much larger than a tornado. A cyclone usually is created mainly due to temperature and pressure differences beside many other minor factors. When a cyclone hits a city it plucks the whole city from the ground; when a tornado hits an area it plucks any thing that it passes through like houses, buildings, trees or cars and vehicles.

The reason behind this power is pressure difference. I will give an example: Imagine that a small tornado is hitting a house. The tornado, as we described is a vortex where the air from its center and outwards rotates in a very high speed. The laws of aerodynamics as per Bernoulli's equation states that P+ 1/2 roe*v^2 is constant. Where P is the pressure and v is the velocity of the wind, and roe is the density of air. Now the faster the air moves, the less is pressure of the area it occupies. That law established, then when we have a high velocity tornado, that means that the rotating wind within that tornado is causing a very low pressure due to the fast moving wind. When the tornado hits a house, the house will be subject to a very low pressure from the area above the house, resulting in a pressure difference between outside and inside the house that could result in plucking out the ceiling of the house because of what we call (delta P); delta p is the pressure difference between the static air inside the house and the dynamic air outside the house and mainly from the top of the house. You could gain aerodynamic power from a tornado resulting from one PSI difference(Pound per inch square) or if you are familiar with the bars concept, the 100 mill-bar of pressure difference could pluck a house from the ground. Now that we understand the principal of aerodynamics and the power created thereof, we can discuss the airplane.
The laws governing the Flight dynamics are the same provided from the laws of Bernoulli's. In an aircraft, the engine are used to create thrust power to move the aircraft forward. The B747 utilized GE CF80 engines which can produce forward thrust equal to 90,000 pounds per engine. In the B747 aircraft, there are 4 of these engines installed. The forward thrust provided therefore is 360,000 pounds. The airplane body and wing are designed in such a manner that the shape of the body is built in accordance with a certain profile which is called in the science of aerodynamics "airfoil design." The wing, the body and the stabilizer (The Horizontal and vertical Fin) of the aircraft are designed as per the principal of the airfoil. The shape of the airfoil is designed such that it allows the air traveling above the airfoil to go faster than the air traveling below the airfoil thus creating Delta P, which as we said earlier a pressure difference. One PSI of pressure difference between the upper surface and the lower surface of the wing or the body is sufficient to create lift, and thus the power of the air in dynamic state can carry an airplane like B747 which weighs approximately over 830,000 pounds.
Recently General Electric have designed engines that can provide aerodynamic power such that the airplane can travel 10 times the speed of sound. This is approximately 10,000 Kilometers per hour.

Answer 2

Power is created by using an engine (for example, to drive an aeroplane or rocket we need engines). Aerodynamic refers to the shape of the plane, the wing spans, the materials used, the surface textures etc. so that the frictional losses are minimised and power is maximised.

You may observe some cars are more aerodyamically designed (smoothly curved) compared to other cars which resemble a box on wheels. Air flows smoothly around the smoothly curved cars and thus fuel efficiency is improved, all others things being equal.