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Modern jet engines have vanes that are deployed to produce a reverse thrust just after a plane touches down on a runway. The air flow rate through a particular engine is 100 kg/s100 \mathrm{~kg} / \mathrm{s}, and the combustion gases exit the engine at a speed of 800 m/s800 \mathrm{~m} / \mathrm{s} relative to the engine. The fuel-air ratio is 1 to 40 in this case. Calculate the reverse thrust produced by the vanes for the configuration shown.

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Answered 1 year ago
Answered 1 year ago
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List down the given data.

Given:

  • Mass flow rate of air: m˙a=100 kgs\dot m_{\text{a}} = 100\ \frac{\text{kg}}{\text{s}}
  • Exit velocity: V=800 msV = 800\ \frac{\text{m}}{\text{s}}
  • Fuel to air ratio: 1:401:40
  • Angle: α=20\alpha = 20^{\circ}

Required:

  • Reverse thrust force, FF

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