Aerodynamics and aerofoils homework

In summary, the conversation discusses the completion of a long assignment on aerodynamics and the remaining four points that the speaker cannot explain regarding aerofoils. The four points include an upflow in air before contact is made with the aerofoil, a downflow after contact, the air not directly striking the airfoil but dividing just below the under surface, and closer streamlines above the aerofoil where the pressure is decreased. The speaker requests for someone to explain these points and suggests using a diagram of an aerofoil from a provided link.
  • #1
theperthvan
184
0
Hi,
I'm doing a looong assignment on aerodynamics, and have just about completed it. There are four points, however, which I cannot explain which refer to aerofoils. They are:
1. There is an upflow in air before contact is made with the aerofoil.
2. There is a downflow after contact with the aerofoil.
3. The air does not directly strike the airfoil, but divides just below the under surface.
4. Above the aerofoil where the pressure is decreased, the streamlines are closer together.

It would be very helpful if someone would be able to explain them for me.
NB You must consider a diagram of an aerofoil. Try http://www.usd.edu/biol/faculty/swanson/ornith/pics/airfoil.gif [Broken]
 
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  • #3


Hi there,

First of all, congratulations on almost completing your aerodynamics assignment! It sounds like you have put a lot of effort into it.

Now, onto your questions about aerofoils. To better understand these concepts, it may be helpful to first have a basic understanding of how aerofoils work. Aerofoils are specially shaped structures that are designed to generate lift when moving through a fluid, such as air. They are commonly used in aircraft wings and propeller blades.

1. The upflow in air before contact is made with the aerofoil is due to the shape of the aerofoil. As the air approaches the aerofoil, it encounters the curved shape of the aerofoil and is forced to change direction. This creates an area of low pressure above the aerofoil, causing the air to flow upwards towards the aerofoil.

2. After contact with the aerofoil, the downflow is caused by the air being deflected downwards by the curved shape of the aerofoil. This downward flow is necessary for generating lift, as it creates an area of high pressure below the aerofoil, which helps to push the aerofoil upwards.

3. The third point refers to the way in which the air flows around the aerofoil. As mentioned before, the air is forced to change direction as it approaches the aerofoil. This change in direction causes the air to "split" or divide, with some of the air flowing over the top of the aerofoil and some flowing under the bottom. This creates a pressure difference between the two surfaces, which contributes to the generation of lift.

4. Finally, the closer spacing of streamlines above the aerofoil is a result of the decreased pressure in this area. As the air flows over the top of the aerofoil, it is forced to travel faster due to the curved shape of the aerofoil. According to Bernoulli's principle, an increase in speed results in a decrease in pressure. Therefore, the air above the aerofoil has a lower pressure compared to the air below, causing the streamlines to be closer together.

I hope this helps to clarify some of the concepts you were struggling with. Don't forget to refer to the diagram you provided for a visual representation of these principles. Good luck with the rest of your assignment!
 

1. What is aerodynamics?

Aerodynamics is the study of how gases, such as air, interact with solid objects, such as wings or aerofoils, as they move through each other.

2. How do aerofoils work?

Aerofoils are curved surfaces that are used to create lift when air flows over them. As air moves over the curved surface, the air pressure above the aerofoil reduces, creating a pressure difference that results in lift.

3. What factors affect aerodynamics?

The shape and size of the object, the speed at which it is moving, the density and viscosity of the air, and the angle of attack (the angle at which the object meets the air) all affect aerodynamics.

4. What are some real world applications of aerodynamics?

Aerodynamics is used in the design of airplanes, cars, and wind turbines. It is also important in sports such as cycling, skiing, and bobsledding.

5. How can I calculate the lift and drag of an aerofoil?

Lift and drag can be calculated using equations that take into account the shape and size of the aerofoil, the air density, and the speed of the object. These equations are based on the principles of fluid dynamics and require advanced mathematical calculations.

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