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LH2 aircraft

2022

SPL is developing a High Altitude Remotely Piloted (HARP) aircraft for telecommunications services. SPL’s HARP aircraft takes advantage of the high gravimetric energy density of liquid hydrogen to enable it to undertake long-endurance telecommunications operations carrying SPL’s unique, high-powered phased array antenna.

Warwick FIRE supported SPL as a sub-contractor to win an award from The Transport Research and Innovation Grant (TRIG) competition. The in-house modified OpenFOAM will be used to simulate four specific scenarios including vent gas caused by passive heat leak into both liquid hydrogen tanks, full bore break of tank nozzle, inadvertent jettison on ground and failure of wing-mounted fuel line. The predictions will be used to establish the regions with hydrogen concentrations to be within the flammability limits. The results will inform SPL in its development of a conceptual analytical tool for screening analysis to establish the size and contents of airfield safety zones on the runway, taxiway and apron areas, needed for the operation of liquid hydrogen-powered aircraft.