Previous Chinese nuclear submarines made a lot of noise and were easily tracked by adversaries.
research team claims to have created a new pump-jet propulsion system that can increase submarine thrust while minimizing obtrusive vibrations by more than 90 percent.
The distance between the rotor blades and the inner wall of the duct can be as little as one millimeter. Yet, it can still create a lot of turbulence or bubbles, slowing the submarine down and revealing its location. Currently, some of the most potent submarines in the world, notably the Seawolf, Virginia, and Columbia classes in the U.S. and the Triomphant class in France, use pump-jet propulsion.The ultimate fix, according to Hua's team, would be to do away with clearance altogether.However, the new pump-jet needed a sealing substance that could keep water strictly outside the trench without obstructing the rotor's movement to function effectively.
One of the key concerns with the new technology is how well the pump-jet performs when the blade tips constantly rub the duct. The scientists placed the apparatus in a waterThey discovered that the clearance-free pump-jet was, in fact, somewhat less efficient than the conventional design at top speed.
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