Reliable operation of adjustable ballast systems is essential for full-ocean-depth manned submersibles, but existing studies mostly focus on component-level performance optimization, leaving the multi-valve coupled instability mechanism under ultra-high pressure insufficiently understood. This paper investigates an uncontrolled water injection failure in the adjustable ballast system of the “Fendouzhe” submersible via fault tr...

Polar navigation demands robust thermal management systems to prevent ice blocking in seawater cooling systems, which is critical for polar navigation. Current anti-icing architectures for disperse ice regions cannot make full use of thermal deicing, resulting in insufficient heat transfer and severe mechanical energy losses in dense ice regions, which eventually cause seawater system ice blockage. Computational fluid dynamics...