This set of Aerodynamics online quiz focuses on “Prandtl’s Classical Lifting-Line Theory – 3”.

1. Is prandtl lifting line theory predicts lift distribution over a three dimensional wing?

a) True

b) False

View Answer

Explanation: The prandtl lifting-line theory is a mathematical model that predicts lift distribution over a three dimensional wing based on its geometry. It is also known as the lanchester-prandtl wing theory. The theory was expressed independently by Frederick w. lanchester in 1907.

2. Is lift over each wing segment is correspond?

a) False

b) True

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Explanation: On a three-dimensional, finite wing, lift over each wing segment does not correspond simply to what two dimensional analysis predicts. Instead, this local amount of lift is strongly affected by the lift generated at neighboring wing section.

3. Is it difficult to predict the amount of lift that a wing geometry will generate?

a) False

b) True

View Answer

Explanation: It is difficult to predict analytically the overall amount of lift that a wing of given geometry will generate. The lifting line theory yields the lift distribution along the span-wise direction, based only on the wing geometry and flow conditions.

4. Is lifting line theory applies to circulation?

a) True

b) False

View Answer

Explanation: The lifting line theory applies the concept of circulation and the kutta-joukowski theorem so that instead of the lift distribution function, the unknown effectively becomes the distribution of circulation over the span.

5. Is lift distribution over a wing can be modeled with the concept of circulation?

a) True

b) False

View Answer

Explanation: The lift distribution over a wing can be modeled with the concept of circulation. A vortex is shed downstream for every span wise change in lift. Modeling the local lift with local circulation allows us to account for the influence of one section over its neighbors.

6. Is vortex filament cannot begin or terminate in the air?

a) True

b) False

View Answer

Explanation: The vortex filament cannot begin or terminate in the air, as such, any span wise change in lift can be modeled as the shedding of a vortex filament down the flow, behind the wing. This shed vortex, hose strength is the derivative of the local wing.

7. Is shed vortex can be modeled at vertical velocity?

a) True

b) False

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Explanation: The shed vortex can be modeled as a vertical velocity distribution. The up wash and downwash induced by the shed vortex can be computed at each neighbor segment. This sideways influence up wash on the outboard, downwash on the in a board.

8. Is change in lift distribution is known as lift section?

a) True

b) False

View Answer

Explanation: The change in lift distribution is known at given lift section, it is possible to predict how that section influences the lift over its neighbors, the vertical induced velocity, up wash or down wash can be quantified using the velocity distribution with in vortex.

9. Is local induced change the angle of attack on a given section of a wing?

a) True

b) False

View Answer

Explanation: The local induced change of angle of attack on a given section can be quantified with the integral sum of the downwash induced by every other wing section. In turn, the integral sum of the lift on each down washed wing section is equal to the total desired amount of lift.

10. Is additional term can be added to make an aircraft wing station?

a) True

b) False

View Answer

Explanation: When the aircraft is rolling, an additional term can be added that adds the wing station distance multiplied by the rate of roll to give an additional angle of attack change, which introduces non-zero even coefficient in the equation that must be an accounted for it.

**Sanfoundry Global Education & Learning Series – Aerodynamics.**

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