The experts and leaders present were silent, and it was indeed too difficult to develop the AIP power system.
In particular, the Stirling engine system is roughly the same as the closed-cycle diesel engine system, except that the engine is a hot gas engine, which was first proposed by the British scientist Robert Stirling in 1816, so it is called the Stirling engine.
The principle of the Stirling engine is the heat engine that heats the external heat source and converts the heat energy into mechanical energy, its circulation adopts a closed, constant volume recuperated gas circulation, and its piston upper chamber is a hot chamber, which is connected with the lower chamber of another piston, and the four cylinders are connected together, so that the working gas moves back and forth between the hot chamber and the cold chamber, driving the piston to move and drive the crank to rotate.
The challenge lies in the underwater combustion system, which uses pure oxygen as an oxidizer and is burned at high pressures above the surrounding seawater pressure.
Of course, the advantages of the Stirling engine are obvious, its mechanical noise and vibration are very small, there will be no deflagration of the diesel engine during the combustion process, and the combustion process is very smooth.
Of course, it also has a lot of shortcomings, the biggest of which is that the power is relatively low, if you want to achieve a higher underwater speed of the submarine, you need to match a few more Stirling engines, so that it will increase a lot of space occupation, and it also has the disadvantage of large fuel consumption, higher than ordinary diesel engines.
The reason why Sweden was able to take the lead in equipping AIP submarines with Stirling engines was also to do long-term research and development work, starting to develop the Stirling engine in the 60s, and after 30 years of development, it was only in the 90s that the V4-275R Stirling engine with a power of 70 kilowatts was produced.
As for China, if it wants to build a Stirling engine now, it is almost starting from scratch, and the difficulty can be imagined.
The head of the navy looked at Shen Huan and said, "What about fuel cells?"
” Shen Huan thought for a while and said, "Chief, the fuel cell may be the most ideal AIP submarine power, because it directly converts the chemical energy of the reactive substance into electrical energy.
In this way, only the reactive substances need to be supplemented, and the benefits of using electrical energy as the power of the submarine are obvious, which can greatly reduce the noise and realize the concealment of the submarine.
However, the research and development of fuel cells is more difficult, and it seems that the most promising one should be the proton exchange membrane fuel cell, which is actually the reverse process of electrolysis of water. ” Chief Engineer Li Jie also agreed: "Yes, the advantages of fuel cells are too obvious.
Its energy conversion efficiency is the highest, which can reach 100% in theory and about 70% in practical applications.
And it also has the advantage that the heat radiation is very small.
This can also effectively reduce the thermal radiation of the submarine, so that the probability of the submarine being detected by the enemy's infrared detection equipment is greatly reduced.
Of course, because there is no mechanical movement in its working process, it is very quiet, and the configuration of this AIP power system can also be very flexible, because it is connected by several batteries, and the power can also be large or small, and can be changed at will. ” Shen Huan took over the conversation again and said: "It's a pity that it is more difficult to develop, and at the same time, the cost performance should be the lowest."
At the same time, it is also very dangerous, once pure hydrogen leaks, it is easy to explode, like a time bomb.
And at present, according to the data revealed by German research, the working life of proton membrane fuel cells is relatively low, and the price is also very high, which is not suitable for a developing country like us!
” The chief nodded and said: "You are all right, in fact, we have been engaged in the pre-research of Stirling engines in a domestic institute for more than ten years, but the progress is not very big at present."
If you want to put on the Stirling engine, it should be the most practical, today listening to your opinions, I think the next step, is to seriously study, let the Stirling engine project officially launched. ” …… With Shen Huan and Li Jie taking the lead, the rest of the comrades also spoke enthusiastically and offered suggestions and suggestions for the development of the navy.
At the end of the meeting, it was already half past six in the evening, and it can be said that the meeting was very hotly discussed, and the leaders completely put aside their leadership roles and discussed the most cutting-edge technical topics in the navy ships with everyone.
After the meeting, the Jiangnan Changxing Shipbuilding Group had already made arrangements and had a relatively simple dinner at the Jiangnan Hotel.
Shen Huan was also fortunate to attend this dinner, this was not the first time he had eaten with the naval chiefs, so Shen Huan was relatively open at the dinner table.
Of course, Shen Huan couldn't be at the same table with the leaders, and it was Feng Haibo and them who accompanied the leaders.
Just halfway through the drink, Li Jie, the chief engineer of the new conventional submarine, sat next to Shen Huan.
"Comrade Shen Huan, come, I toast you, your speech today is very exciting, and I admire the old man very much!"
As soon as Chief Master Li Jie came over, he took the initiative to toast Shen Huan.
This made Shen Huan very embarrassed, he hurriedly picked up the wine glass, and said to Chief Master Li Jie: "Chief Master Li, aren't you tormenting me?"
I should respect you for this cup, you are an old-timer, a model for our younger generation!
” Chief Master Li Jie smiled and said, "Young man, you are too polite to say this.
Come on, let's do it!
” After drinking a glass of wine, Chief Engineer Li Jie said with relief: "It's really the back waves of the Yangtze River pushing the front waves, I didn't expect Comrade Shen Huan, you still have so much research on submarines, especially AIP submarines, I'm really old!"
” Shen Huan hurriedly said: "Chief Master Li, you have won the award, I am talking on paper!"
It is all open information from foreign research, and if we really want to realize the AIP of our country's submarines, we have to rely on experts like you. ” Chief Li Jie hurriedly waved his hand and said: "No, no, no, I am just engaged in the overall design, AIP power system, it has to be our domestic professional research institute, today the chief said a certain institute, in fact, it is 711, today they did not represent, but if this project is really launched, I think I still have a chance to see the day when our country's AIP submarine is launched!"
” Shen Huan hurriedly said: "Chief Master Li, you must be able to see it, I believe that our scientific researchers will be able to develop our Stirling engine as quickly as possible."
And you will definitely be able to see that day, as a submarine chief engineer, I think you are still very young!
” When Chief Master Li Jie heard this, he couldn't help laughing and said: "Comrade Shen Huan, you are really good at talking, I still love to listen to this!"
” Shen Huan's amount of alcohol was indeed not very good, so he got drunk without drinking much, and finally took a taxi back.
Lin Miaoyu was not there tonight, and she also knew that Shen Huan had gone to accompany the leader to dinner, so she went back to her aunt's house.