The Military-industrial Scientific Research System of the Academic Master Chapter 144

Chapter 144: The possibility of aviation modification (completed for flankerr's additional updates)

 “Well...let me think about it.”

Chang Haonan did not immediately answer Lin Qing's question.

 It is not difficult to modify a gas turbine for power generation under the premise of fully mastering the design of the core aircraft engine.

Industrial gas turbines have almost no requirements on volume and weight, and natural gas in this era is very cheap. Most users are also large natural gas producers such as oil fields. The higher the fuel consumption, the higher the fuel consumption. Therefore, the performance trade-off is mainly based on power, compared with aero engines. orientation is very close.

 So while switching fuel from jet fuel to natural gas may seem like a big change, it actually requires only a few changes, namely those required to switch from liquid fuel to gas.

  But the power gas turbine is 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. 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 efficiency achieved when optimizing the turbojet 14.

 After careful consideration, Chang Haonan finally spoke again:

“There are two main ideas for aeroderivative combustion of dual-rotor turbojet engines, and the main differences are in the air intake mechanism.”

"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 the new low-pressure compressor and low-pressure compressor Turbine, using a new low-pressure turbine to drive a new low-pressure compressor and directly drive the load, thus eliminating the need for a power turbine. "

“If you are rushing to a certain time point and are in urgent need of 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 It hasn't started yet, but I can definitely catch up, how about it?”

Lin Qing, who heard the news, couldn't believe it was true:

 “Can it really be completed in one year... in one year?”

 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 since it uses 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 shear generated by the venturi tube pre-filming 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 volume and workload are not huge, and one year is enough. ”

 “That would be great, that would be great…”

Lin Qing, who was overjoyed, quickly picked up the cup and took a sip of wine before she managed to prevent herself from losing her composure due to overexcitement:

“As long as gas turbine power is available, the rest will be small problems, all small problems…”

“Oh, by the way, Comrade Xiao Chang, you only talked about the design part before. 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 what he saw when he visited Factory 410.

"If I have to say, some imported equipment needs to be used in the manufacturing and testing process, but the parts and materials are all produced by us. Therefore, although we are not sure what the final allocation price will be, the cost is definitely acceptable. control, and can save valuable foreign exchange.”

He knew very well the meaning of Lin Qing's 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!”

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 under the flag of the People's Navy?

To achieve this, the first condition is that the number of buildings 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.

 But the import quota in military equipment funds is limited.

 If it is used here, it will be cut off a little 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 could not bear the sudden enthusiasm and silently withdrew his hand:

“Although I am not a person in 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 expression changed slightly, and then she solemnly thanked him.

 In fact, for a long time, there has been fragmentation among 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 701 Institute and 606 Institute can be achieved, it may be an opportunity to break the ice.

“However, Chief Engineer Lin, I hope you can promise me one thing, to Office 606.”

Just when the two were about to end their conversation, Chang Haonan remembered something he had seen in internal materials before:

“What happened with the Type 055 destroyer must never happen again.”

 (End of this chapter)

Chapter end