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Thermofluids 2. (AJNB_JFTA019)

Thermofluids 2. (AJNB_JFTA019)

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The friction drag is maximal in the geometry case of:

Paralell flat plate

From the following cases:

Paralell flat plate, Sphere, Air Foil

Which statement is true regarding to stall?

Stall is the point for maximal pitching moment

Stall is a sudden loss of lift due to flow separation

Stall means an area on the diagram with the axes of angle of attack and lift coefficient where the flow is attached.

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In which case of geometry is the drag coefficient minimal?

Formula 1 racecar

Flat plate in normal position to the stream

Sphere

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The desired effect of generating lift is the apperance of aerodynamic moment.

The aerodynamic moment is the key for the aircrafts in flying.

Center of pressure, Aerodynamic center

Which one is TRUE?

A) The center of pressure is that location along the chordline, where the resultant aerodynamic force acts.

B) Aerodynamic center is that location along the chordline, around which the pitching moment does not change with increasing angle of attack.

None of them are true.

A); B)

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In the case of aerodynamical resultant forces acting on the airfoil,

the resultant force can be decomposed into two sets of components:

relative to the chord line: N - normal force; A - axial force

relative to te freestream velocity: L- lift, D - drag

✅

relative to the chord line: L- lift, D - drag

relative to te freestream velocity: N - normal force; A - axial force

❌

"x" wise, "y" wise and "z" wise forces according to an arbitrary chosen reference frame

❌

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Streamline is a line to which velocity vectors are tangential at all points along itself.

In long pipe systems, we are accurate if we assume that the flow is uniform, and the velocity profile of the fluid is constant through the cross section of the pipe.

The bellmouth opening of a tube can prevent delamination and turbulence of the fluid.

True

False

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“The Euler equations describe the motion of a fluid as a continuum field, not individual fluid particles,

while

the Lagrange equations describe the motion of individual particles or systems based on energy principles (kinetic and potential energy).”

True

False

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