AA311.Lecture16.Slides

AA311.Lecture16.Slides - AA311: Atmospheric Flight...

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Unformatted text preview: AA311: Atmospheric Flight Mechanics Lecture 16: Range and Endurance Dr. Laszlo Techy University of Washington Department of Aeronautics & Astronautics November 09, 2011 Dr. Laszlo Techy AA311: Atmospheric Flight Mechanics Range and Endurance Range: How far can we fly with a tank of fuel? Endurance: How long can we stay in the air with a tank of fuel? Cruise begins at the end of the climb. Cruise ends when the descent phase begins. For a given amount of fuel load, the horizontal distance covered during the cruise flight is called cruise range. Dr. Laszlo Techy AA311: Atmospheric Flight Mechanics Range and Endurance: Why care? Range is important for commercial transport airplanes like the Boeing 747 or Airbus 320, and also for military bombers like the B-52 or the B-1. Want to know how far you can get. Minimum fuel consumed per unit distance covered. Endurance is the total time that an airplane can remain in the air for a given fuel load. The endurance is an important performance measure for reconnaissance or surveillance airplanes. Loiter is that phase of flight where the primary aim is to remain airborne and not worry about distance. Long-range bombers may loiter while on an airborne alert. A fighter aircraft on a combat air patrol mission loiters while guarding the airspace. When the primary aim is to be airborne, the aircraft will fly at that speed when the fuel consumed per unit time is minimum. Dr. Laszlo Techy AA311: Atmospheric Flight Mechanics Specific Fuel Consumption: Propeller Airplane For a constant power aircraft the power-specific fuel consumption (PSFC) is weight of fuel consumed per unit time per unit power: c p =- W P The power available for propulsion is less than the power developed by the engine P A = P : propeller efficiency P shaft brake power Weight decreases as fuel is burnt. Dr. Laszlo Techy AA311: Atmospheric Flight Mechanics Specific Fuel Consumption: Jet Airplane For a constant thrust aircraft the thrust-specific fuel consumption (TSFC) is weight of fuel consumed per unit time per unit thrust: c t =- W T Dr. Laszlo Techy AA311: Atmospheric Flight Mechanics Range and Endurance Develop formulas for range and endurance....
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AA311.Lecture16.Slides - AA311: Atmospheric Flight...

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