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In aerospace engineering, max Q is the point of maximum dynamic pressure, the point at which aerodynamic stress on a spacecraft in atmospheric flight is maximized.
Considering the definition of dynamic pressure: q = ρv2 / 2, we have that such quantity:
- is zero at lift-off, when the vehicle's speed v = 0
- is zero outside the atmosphere, where the air density ρ = 0
- is always positive (or zero, as above) given the quantities involved
Therefore there will be necessarily a point where the dynamic pressure is maximum: that point is precisely max Q.
In other words, below the max Q point, the effect of the spacecraft acceleration overcomes the decrease in density. Above the max Q point, the opposite is true.
During a normal Space Shuttle launch, for example, max Q is at an altitude of around 11 km (35,000 ft).[1] During a typical Apollo mission, max Q occurred approximately between 13 km and 14 km of altitude (43,000 ft - 46,000 ft).[2][3]
[edytuj] See also
- Dynamic pressure
- Pressure
- Prandtl-Glauert singularity
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Kategoria:Dynamika płynów
