摘要:
A pressure monitoring system (28) for a fuel tank (12) includes a supply line (16) fluidly coupling a fluid source (20) with at least one fuel tank (12) for supplying an inert gas (14) to the at least one fuel tank (12). Also included is a pressure relief valve (30) in communication with the supply line (16) configured to detect a pressure differential between a supply line pressure and an ambient pressure. Further included is a pressure sensor (32) configured to detect the supply line pressure. Yet further included is a controller (34) in operable communication with the pressure sensor (32) and the fluid source, wherein the controller (34) is configured to modify a flow rate of the inert gas (14) in the supply line (16) upon detection of the supply line pressure exceeding a predetermined pressure limit.
摘要:
The invention aims at pressurising a volume (2) that needs to have a relative air pressure, in comparison with an ambient pressure, where the ambient air pressure can change rapidly and with large amplitude and where the access to pressurised air is limited. This is solved by a half open system comprising two parallel regulators (9) and (17) and two ejectors (15) and (19) working according to a split range control principle. When the relative air pressure difference is above a desired value of the second regulator (17), only the first regulator and the first ejector work. When the relative air pressure difference is below the desired value of the second regulator (17), both regulators (9) and (17) and ejectors (15) and (19) work. In this way the pressure inside the volume (2) can adapt rapidly to the changes in the ambient pressure, without leaking too much air during a static condition.
摘要:
A hydraulic damping apparatus 2 comprising a conduit 4 for a hydraulic fluid having a port 12 in a wall of the conduit 4; a resonator 6 having a chamber 9 and a neck 10, the neck 10 being arranged to provide fluid communication between the chamber 9 and the port 12. The apparatus 2 further comprises a first pressure sensor 22 arranged to sense pressure in the conduit 4 upstream of the port 12, a second pressure sensor 24 arranged to sense pressure in the conduit 4 downstream of the port 12, and a controller 18 configured to determine the amplitude of a pressure fluctuation sensed by the first pressure sensor 22 and the amplitude of a pressure fluctuation sensed by the second pressure sensor 24. The controller 18 is further configured to vary a resonant frequency of the resonator 6 in accordance with a difference between the amplitude of the pressure fluctuation sensed by the first pressure sensor 22 and the amplitude of the pressure fluctuation sensed by the second pressure sensor 24.
摘要:
A hydraulic damping apparatus 2 comprising a conduit 4 for a hydraulic fluid having a port 12 in a wall of the conduit 4; a resonator 6 having a chamber 9 and a neck 10, the neck 10 being arranged to provide fluid communication between the chamber 9 and the port 12. The apparatus 2 further comprises a first pressure sensor 22 arranged to sense pressure in the conduit 4 upstream of the port 12, a second pressure sensor 24 arranged to sense pressure in the conduit 4 downstream of the port 12, and a controller 18 configured to determine the amplitude of a pressure fluctuation sensed by the first pressure sensor 22 and the amplitude of a pressure fluctuation sensed by the second pressure sensor 24. The controller 18 is further configured to vary a resonant frequency of the resonator 6 in accordance with a difference between the amplitude of the pressure fluctuation sensed by the first pressure sensor 22 and the amplitude of the pressure fluctuation sensed by the second pressure sensor 24.
摘要:
An aircraft fuel tank ventilation system comprising a dehumidifying device (17) disposed in flow communication between a vent (15) open to the atmosphere and a fuel tank (4,5). Also, a method of dehumidifying air introduced into an aircraft fuel tank via a ventilation system, the method comprising directing atmospheric air through a dehumidifying device disposed in flow communication between a vent of the ventilation system and the fuel tank, which removes water vapour from the air flowing from the vent towards the fuel tank. Also, a method of regenerating a desiccant medium (22) used to dehumidify air introduced into an aircraft fuel tank via a ventilation system, the method comprising directing air through the desiccant medium so as to dry the desiccant medium. By effectively removing water from air entering the aircraft fuel tank, the content of water in the fuel tank can be kept low, which improves fuel system component reliability, reduces maintenance activities, and reduces microbiological contamination.
摘要:
An apparatus is provided for a fuel tank system for an air vehicle. The system comprises a container (100) having an interior adapted to hold fuel, the container comprising a first opening (112) placing the interior in fluid communication with the ambient atmosphere, and a volumetrically-adjustable sizing device (130) adapted to change volume in response to changes in surrounding air pressure, the sizing element (130) disposed within the container and adapted to contain a fluid.