Test for composite inner tank with liquid hydrogen
Establishing hydrogen as an energy carrier is a key element of climate-neutral aviation. To achieve this, we are developing a pioneering tank concept based on CFRP end caps. These components, made from carbon fibre-reinforced polymer, are joined together via a dedicated connecting frame to form a complete low-pressure tank for liquid hydrogen. The exhibit illustrates this structure using two CFRP end caps with a diameter of 400 millimetres and a suggested connecting frame. This frame also incorporates the necessary system feedthroughs required for filling the tank and the controlled extraction of hydrogen on board.
A central aspect of the project is verifying the structural performance and gas-tightness of the lightweight components. The CFRP end caps are therefore comprehensively tested on the UpLift test rig prior to assembly. This test environment is designed for component diameters ranging from 400 to 1700 millimetres, allowing material properties to be precisely assessed under operating conditions.
The demonstrator shown here is in line with the current development strategy for liquid hydrogen storage in aviation. Beyond the engineering itself, the approach serves as a blueprint for new certification procedures for hydrogen tanks, helping to ensure the safety and reliability of novel storage technologies for the future of air transport.
Link:
German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR)
DLR Institute of Lightweight Systems
E-Mail contact-dlr@DLR.de
