Wikipedysta:Leafnode/Brudnopis w encyklopedii

Z Wikipedii, wolnej encyklopedii < Wikipedysta:Leafnode Przejdź do nawigacji Przejdź do wyszukiwania A condensation cloud forms around an interstage as the Apollo 11 Saturn V encounters max Q, at about 1 minute 20 seconds into the flight (altitude 12.5 km, 4 km downrange, velocity 440 m/s).

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 = ρ v 2 / 2 {\displaystyle q=\rho v^{2}/2} , we have that such quantity:

  • is zero at lift-off, when the vehicle's speed v = 0 {\displaystyle v=0}
  • is zero outside the atmosphere, where the air density ρ = 0 {\displaystyle \rho =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]

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Kategoria:Astronautyka Kategoria:Dynamika płynów

Widzisz mogę zmienić Twój brudnopis Czopek27 (dyskusja) 14:33, 19 cze 2009 (CEST)

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  1. Douglas T. Jackson: Space Shuttle Max-Q. W: Aerodynamics Questions [on-line]., 2001-05-06. [dostęp 2007-02-12].
  2. David Woods, Frank O'Brien: Apollo 8, Day 1: Launch and Ascent to Earth Orbit. W: Apollo Flight Journal [on-line]. NASA, 2005-08-21. [dostęp 2007-02-14].
  3. Tim Brandt, David Woods: Apollo 16, Day One Part One: Launch and Reaching Earth Orbit. W: Apollo Flight Journal [on-line]. NASA, 2004-10-29. [dostęp 2007-02-14].
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