ProtossHeat said:This pic is from the top of the page from the "drag (friction)" Wikipedia. If I can interpret it to mean that 90% of the total drag on a streamlined body is due to skin friction (since form drag has been minimized), then I think it would be interesting to see what would happen if this concept was applied to such a body.
I wonder also what portion skin drag plays in an aerodynamic body with a larger surface area than normal, like with those solar cars, or a long fuselage of a passenger plane.
I guess I'll end up bothering someone at a campus with a college of mechanical and aerospace engineering department, to see if they can shoot down this concept and/or elaborate on it some.
boneh3ad said:If you could make the moving surface move at the same rate as the vehicle in the opposite direction, you could eliminate quite a bit (not quite all) of the friction drag on the surface in theory, but it would be extraordinarily impractical. For starters, you would likely use up as much energy rotating the surface as you would save due to the drag reduction if not more. It also would mean more parts that can break down. Also, how would you then have doors, windows, windshields etc if there is essentially a conveyor belt around the vehicle? You would have so many openings in the moving surface that the benefit would be even more negligible (or the penalty would be greater if that is the case).
The drag coefficient is a dimensionless quantity that represents the resistance an object experiences when moving through a fluid, such as air or water. It is calculated by dividing the drag force by the product of the fluid density, the reference area, and the square of the flow velocity.
A static surface refers to an object that is not moving through the fluid, while a non-static surface refers to an object that is in motion. The drag coefficient for a static surface is constant, while for a non-static surface it varies depending on the object's shape, orientation, and velocity.
The drag coefficient plays a significant role in an object's aerodynamics. A higher drag coefficient means that the object will experience more resistance and require more energy to move through the fluid. On the other hand, a lower drag coefficient allows for a smoother flow of the fluid and can improve an object's overall aerodynamic performance.
Yes, a diagram can be used to visually represent the drag coefficient for non-static surfaces. It typically includes a graph with the drag coefficient plotted against the object's angle of attack or velocity. This helps to visualize how the drag coefficient changes with different variables.
The drag coefficient for non-static surfaces is used in various fields, such as aerospace engineering, automotive design, and sports equipment. It helps engineers and designers to optimize the shape and orientation of objects to reduce drag and improve performance. It is also used in simulations and calculations to predict an object's behavior in different fluid environments.