Unit 02: Basics Of Flight Physics - Lift at Fachhochschule Aachen | Flashcards & Summaries

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# Lernmaterialien für Unit 02: Basics of Flight Physics - Lift an der Fachhochschule Aachen

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TESTE DEIN WISSEN

How does the body-fixed coordinate system look like?

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TESTE DEIN WISSEN

Mostly through the center of gravity.
The x-axis points into longitudinal direction, while the y-axis is normal to that, pointing upward or downward

Lösung ausblenden
TESTE DEIN WISSEN

The total aerodynamic force F_aero consists of which two parts?

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TESTE DEIN WISSEN

-total force due to pressure
-total force due to shear (friction)

Lösung ausblenden
TESTE DEIN WISSEN

In which two components can F_aero be split up to? (in aerodynamic coordinate system)

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TESTE DEIN WISSEN

into lift and drag

Lösung ausblenden
TESTE DEIN WISSEN

What forces produce lift?

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TESTE DEIN WISSEN

Lift is mainly produced due to pressure, which is acting on the body

Lösung ausblenden
TESTE DEIN WISSEN

What produces drag?

Lösung anzeigen
TESTE DEIN WISSEN

Drag is due to pressure and friction acting onto the body

Lösung ausblenden
TESTE DEIN WISSEN

How does the aerodynamic coordinate system look like?

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TESTE DEIN WISSEN

It is defined in relation to the incoming flow. The x-axis is in the direction to the incoming flow, the y-axis is normal to that.

Lösung ausblenden
TESTE DEIN WISSEN

Which four forces are acting onto an aircraft?

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TESTE DEIN WISSEN

-lift (normal to airstream)
-drag (parallel to airstream)
-thrust (usually slighty inclined towards the aircraft reference axix)
-mass forces (weight + inertia forces)

Lösung ausblenden
TESTE DEIN WISSEN

How is lift generated?

Lösung anzeigen
TESTE DEIN WISSEN

Lift is generated by re-directing the airstream:
By accelerating the flow on the upper side and decelerating the flow on the lower side

Lösung ausblenden
TESTE DEIN WISSEN

How is drag generated? (generally)

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TESTE DEIN WISSEN

Drag is generated by declerating (slowing down) the airstream

Lösung ausblenden
TESTE DEIN WISSEN

How does the pressure distribution of an airfoil look like?

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TESTE DEIN WISSEN

upper side: low pressure
bottom surface: high pressure

Lösung ausblenden
TESTE DEIN WISSEN

What can one tell from the cp- curves?

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TESTE DEIN WISSEN

The larger the area they enclose, the higher the pressure force and the higher the lift

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TESTE DEIN WISSEN

What is the camber line?

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TESTE DEIN WISSEN

the line where upper and lower surface has the same distance

Lösung ausblenden
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Q:

How does the body-fixed coordinate system look like?

A:

Mostly through the center of gravity.
The x-axis points into longitudinal direction, while the y-axis is normal to that, pointing upward or downward

Q:

The total aerodynamic force F_aero consists of which two parts?

A:

-total force due to pressure
-total force due to shear (friction)

Q:

In which two components can F_aero be split up to? (in aerodynamic coordinate system)

A:

into lift and drag

Q:

What forces produce lift?

A:

Lift is mainly produced due to pressure, which is acting on the body

Q:

What produces drag?

A:

Drag is due to pressure and friction acting onto the body

Q:

How does the aerodynamic coordinate system look like?

A:

It is defined in relation to the incoming flow. The x-axis is in the direction to the incoming flow, the y-axis is normal to that.

Q:

Which four forces are acting onto an aircraft?

A:

-lift (normal to airstream)
-drag (parallel to airstream)
-thrust (usually slighty inclined towards the aircraft reference axix)
-mass forces (weight + inertia forces)

Q:

How is lift generated?

A:

Lift is generated by re-directing the airstream:
By accelerating the flow on the upper side and decelerating the flow on the lower side

Q:

How is drag generated? (generally)

A:

Drag is generated by declerating (slowing down) the airstream

Q:

How does the pressure distribution of an airfoil look like?

A:

upper side: low pressure
bottom surface: high pressure

Q:

What can one tell from the cp- curves?

A:

The larger the area they enclose, the higher the pressure force and the higher the lift

Q:

What is the camber line?

A:

the line where upper and lower surface has the same distance

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