By V. Shmyrov, et al.,
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Additional info for Airplane Power Plants Systems Designing (synopsis)
All metal elements of a fuel system should be interconnected and also connected to the aircraft (and to ground at parking) in order to prevent a discharge of a static electricity. – At a distance of 500 mm from the end, the wing should not be filled with fuel; to be on the safe side at lightning stroke. – Fuel pipelines are desirable to be placed inside the fuel tanks. In case of a leakage, the fuel flows in the fuel tanks, instead of flowing in the airframe. 3. The fuel tanks should contain reserve of the fuel required for flight with the specified maximum range (duration) and a stand-by reserve of fuel for 45 minutes of flight.
1, a). Forced oscillations are performed under influence of the given shaking forces. The forced vibration frequency is equal to frequency of the shaking force (Fig. 1, b). a b Fig. 1. Free and Forced Oscillations The amplitude of oscillation sometimes reaches such value that it complicates a normal operation of instruments and gears and can cause breaking of structure elements. Vibrations reduce the service life and reliability of parts and equipment and frequently cause fatigue failures of a structure.
Fuels with higher saturated vapor pressure (for example petrol) vapors faster. It improves start-up qualities of engines. Saturated vapor pressure grows with increase of temperature (Fig. 2). 60 3. Viscosity of fuel determines a hydraulic resistance in a fuel system, impacts to activity of the fuel system equipment, to start-up of an engine. For instance let’s cite some values of factor of kinematic viscosity of aviation fuels. 59⋅10-6 As it is shown in the table, the kinematic viscosity exponentially drops with increase of temperature (Fig.