Chapter 144 The Possibility of Aircraft Diversion (completed for flankerr’s additional update)
“Well... let me think about it.”
Chang Haonan did not answer Lin Qing’s question immediately question.
On the premise of fully mastering the design of the core aircraft engine, it is not difficult to modify a gas turbine for power generation.
Industrial gas turbines have almost no requirements on volume and weight, and natural gas in this era is very cheap. Most of the users are also large natural gas producers such as oil fields. The higher the fuel consumption, the higher the fuel consumption, so the performance choice is based on power. Mainly, it is very close to the orientation of aircraft engines.
So while switching fuel from jet fuel to natural gas may seem like a big change, it actually requires only a few changes, other than those required to switch from fuel liquid to gas.
But power gas turbines are different.
On the one hand, its performance trade-off is mainly based on thermal efficiency. After all, the fuel that can be carried on board is limited. The higher the thermal efficiency, the longer the endurance time can be maintained. The operating conditions need to be optimized first.
On the other hand, marine fuel is mainly light diesel, which has much poorer fluidity than aviation kerosene, and is more troublesome than using natural gas.
In addition, Chang Haonan will soon be involved in the improvement of the J-7F and the No. 10 project, and most of the specific design work is expected to be completed by the 606 Institute alone.
In short, it is difficult to achieve the same efficiency as when optimizing the turbojet 14.
After careful consideration, Chang Haonan finally spoke again:
“There are two main ideas for aeroderivative combustion of twin-rotor turbojet engines, and the main difference is the air intake mechanism.”< br>
“The first is to remove the exhaust nozzle, use the dual-rotor structure as the gas generator of the gas turbine, and then equip it with a matching power turbine; the second is to remove the entire low-pressure component and redesign a new Low-pressure compressor and low-pressure turbine, use the new low-pressure turbine to drive the new low-pressure compressor and directly drive the load, which can save a power turbine.”
“If you have to rush to a certain time point, it is very urgent. As for a design plan or prototype, I think Institute 606 can first use the first idea to come up with an early model for you to conduct overall technical verification.”
"This time should be very fast, about half a year, or no more than a year at most, but it will definitely be worse in terms of fuel economy. We will use the second idea to upgrade and improve it later. Anyway, even the overall design of your frigate is We haven’t started yet, but we can definitely catch up, how about it?”
Lin Qing couldn’t believe it when he heard the news:
“One year... one year can really be done. Finished?"
Judging from his slightly trembling tone, this question is obviously not questioning Chang Haonan's ability.
The latter smiled and nodded:
"The foundation of the turbojet 14 engine is very good, especially the use of a more advanced annular combustion chamber instead of a simpler annular combustion chamber from the beginning. The fuel atomization is through a pneumatic atomization fuel nozzle and a venturi tube. The two-stage cyclone cup with a sleeve structure can take advantage of the strong shearing effect generated by the venturi tube pre-film and the double cyclone to make the atomization, evaporation and blending processes stronger."
"So. If the requirements for fuel economy can be relaxed, the overall changes will not be very large. In addition, it is a medium-sized engine. The design is very compact, and there is no need to spend too much energy to reduce the size of the gas engine. The workload is not very big, one year is enough.”
“That’s great, that’s great...”
The overjoyed Lin Qing quickly picked up the cup and drank. After taking a sip of wine, I managed to prevent myself from losing my composure due to overexcitement:
“As long as the power of the gas turbine is available, the rest are all small problems, all small problems...”
"Oh, by the way, Comrade Xiao Chang, you only talked about the design part before, and what about production. Do you need to import foreign parts or raw materials during the production process?"
Chang Haonan took a few seconds to recall. Let’s talk about what I saw when I visited Factory 410 before.
“If I have to say, some imported equipment needs to be used in the manufacturing and testing process, but the parts and materials including the materials are all produced by us, so although we are not sure yet what the final allocation price will be , but the cost can definitely be controlled, and valuable foreign exchange can be saved.”
He knew very well what Lin Qing meant by the question just now, so he emphasized the last two sentences. .
In 1996, the country’s foreign exchange reserves were only US$110 billion, not long after the trade deficit phase ended.
National production means low cost.
It doesn’t matter even if the local currency value of the transfer price is more expensive than the import based on the exchange rate.
Whether you are willing to admit it or not, in this era, currencies such as the RMB and the US dollar and the British pound are indeed not in the same status at all. Sure enough, after hearing this answer, Lin Qing put down the wine glass and held Chang Haonan's hand with both hands:
"Comrade Xiao Chang, you are simply our savior!"
< br>
Just like every aircraft design institute hopes that its products will be used as the main equipment of the Air Force, the Naval Ship Research Institute also hopes that its ships will become the flagship model of the Navy.
Of course, in this field, 701 is the only one with almost no external competition.
But as a model chief engineer, you always have to have dreams.
Who doesn’t want to see the ships he designed spread across the three major fleets, sailing across the oceans flying the flag of the People’s Navy?
To achieve this, the first condition is that the number of constructions cannot be too small.
A model like the 052, which built two ships but ended hastily, can only be used as a star ship and cannot become a backbone force.
The construction quantity is obviously closely related to the cost.
Under the same conditions, the cost of construction and use of gas turbines is definitely higher than that of diesel engines.
However, many key components of the Pierstik diesel engine still need to be imported from France. If the gas turbine can be fully domestically produced, the situation will be different.
The local currency is more expensive if it is more expensive.
However, the import quota in military equipment funds is limited.
If you use it here, you have to dig it out a little bit there.
The money saved on imported diesel engine parts can be exchanged for a few anti-submarine helicopters, or regional air defense missiles, supersonic anti-ship missiles and other things that the navy most urgently needs.
“It doesn’t matter.”
Chang Haonan couldn’t bear the sudden enthusiasm and silently pulled his hand back:
"Although I am not a member of the ship system, both the Air Force and the Navy are our people's military. I am also very happy to be able to help our brother units."
Lin Qing's complexion changed slightly. , and then solemnly thanked him.
In fact, for a long time, there has been fragmentation between military industrial units of different systems.
Especially during the 15 years from the mid-1970s to the early 1990s, some frictions inevitably occurred in the process of each company "making its own way", and the mutual exclusion was quite serious.
Ten years ago, Shipbuilding Industry would not have come to help the air show co-organized by the aviation industry.
By the mid-1990s, although the situation had improved a lot, like a family that had just had a quarrel, the lack of communication between them was still inevitable.
Otherwise Lin Qing would not know anything about the situation of Turbojet 14.
If this cooperation between the 701st Institute and the 606th Institute can be achieved, it may be an opportunity to break the ice.
"However, Chief Engineer Lin, I hope you can promise me something to Office 606."
Just when the two were about to end their conversation, Chang Haonan remembered again Here are some things I have seen in internal materials before:
"What happened with the Type 055 destroyer must never happen again."
(End of this chapter)