VL 8 -Waves in space - steady super sonic flows

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7 Terms

1
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What does homentropic mean? what is the difference to isentropic?

Entropy is constant in the whole flow field.

Isentropic: Entropy is cosntant along a streamline

2
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What does isoenergetic mean?

Total Enthalpy is constant in the whole flow field

3
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State the definion of the Machangle and the local flow angle

Machangle sin(alpha) = 1/M

local flow angle: tan(θ) = v / u

• v = Geschwindigkeit in y-Richtung (senkrechte Strömungskomponente)

• u = Geschwindigkeit in x-Richtung (parallele Strömungskomponente)

<p>Machangle sin(alpha) = 1/M</p><p>local flow angle: tan(θ) = v / u</p><p></p><p>• v = Geschwindigkeit in <strong>y-Richtung</strong> (senkrechte Strömungskomponente)</p><p>• u = Geschwindigkeit in <strong>x-Richtung</strong> (parallele Strömungskomponente)</p><p class="p1"></p>
4
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Give the formulars for linearized characteristic quantities and curves

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5
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Considering 2-D steady waves in supersonic flow: Can this theory be applied to subsonic flows? why?

No, because many relevant quantities are only well defined for supersonic flows

6
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How do compression and expansion turn the flow?

Compressions: decrease relevant Angle

Expansions: increase relevant angle

7
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How are changes in velocity related to changes in pressure coefficient?

multiply by “-2”