According to related news, Wuhan Tianyu Intelligent Manufacturing Co., Ltd. has successfully overcome the 3D manufacturing technology of pump jet propulsion system blades, and has provided large-scale pump jet propulsion units for domestic large-scale shipbuilding units. This shows that The domestic pump jet propulsion system technology has made great progress and entered the practical stage.
Previously, the outside world has speculated that the new generation of domestically-made submarines will generally adopt pump jet propulsion systems to reduce noise and increase speed. The 3D printing blade technology paved the way for mass production of pump-jet propulsion systems.
Submarine has been using propeller propulsion system since it was invented. The propeller technology is mature, and the cost and expense are relatively low. But its shortcomings are also very obvious; the first is that the noise is relatively large, the propeller generates thrust through direct strokes, and it is easy to form turbulence and bubbles, which will increase the noise of the submarine. The propulsion efficiency is low. The propeller throws the water backwards to generate thrust through high-speed rotation, but high-speed rotation also produces torsion on the hull, which consumes engine propulsion power and reduces the speed of the submarine. In this case, the pump jet propulsion system appeared.
Compared with propellers, the biggest advantage of pump jet propulsion system is lower noise. Although the pump-jet propulsion system also has blades, its blades are blocked by ducts, so that noise is not easily transmitted. Under the same conditions, the diameter of the blades of the pump-jet propulsion system is also smaller than that of the propeller. Therefore, at the same speed, the rotational linear speed of the pump-jet propeller blades is lower, and the water flow entering speed is more uniform, which can reduce the generation of bubbles. Further reduce the rotating noise of the propeller. Quiet performance is the main performance of the submarine, and the good quiet performance of the pump jet propulsion system is very attractive.
pump jet propulsion system has another advantage, that is, high propulsion efficiency. The pump-jet propulsion system can reduce the loss of propulsion energy and increase the effective thrust, thereby increasing the submarine's underwater speed. Speed is also very important for submarines. Judging from experience at home and abroad, submarines with superior speeds are in an advantageous position in underwater operations, and faster submarines can quickly catch up with the opponent, and it is easier to get rid of the opponent's tracking. It is precisely because the pump-jet propulsion system has the advantages of good quiet performance and excellent high-speed performance, more and more modern submarines adopt pump-jet propulsion systems. Of course, the pump-jet propulsion system also has its own shortcomings. First of all, the volume and weight of the pump-jet propulsion system are 2-3 times that of the propeller. The design is difficult, the flow field inside and outside the duct is complicated, and the hydrodynamic design is difficult. Blades, stators, and ducts have high requirements for manufacturing and installation, and they are also troublesome to maintain.
According to relevant information, the blades of the submarine pump-jet propulsion system originally required a 10,000-ton hydraulic press, which was a long time and high cost. Now adopts the "intelligent micro-casting and forging" 3D printing technology, creatively combining metal casting and forging technology into one, which improves the production efficiency of the blade. The production cycle is shortened from several months to several weeks, which greatly saves energy consumption and significantly improves the fatigue life and reliability of materials. Therefore, this technological breakthrough indicates that the production speed of the domestic pump-jet propulsion system can be effectively improved, which lays a solid foundation for the large-scale application of the pump-jet propulsion system of the new domestic submarine.
Overseas data believe that China may be designing and building a new generation of attack nuclear submarines. This attack nuclear submarine should use a pump jet propulsion system, so the new generation of attack nuclear submarines have underwater The advantages of good quiet performance and good speed are the backbone and backbone of the Navy's underwater combat capabilities after 2020. After being delivered and installed, it will effectively enhance the Navy's ocean-going underwater combat capabilities.
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