When they heard that they wanted to discuss with themselves how to carry out their work in the future, a group of old Maozi immediately breathed a sigh of relief: since they wanted to discuss with themselves how to start a war work, they did not have to worry about what coercive measures the Chinese would take against them. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

Vlasievich and Grigorievich were even more anxious, and when they came back from Donglaishun, they didn't go back to their rooms at all, and followed Chen Geng directly to Chen Geng's room.

"Mr. Grigorievich, Mr. Vlasievich, don't you need a break?" Chen Geng sighed, these two old hairy men didn't drink less when they were eating hot pot: "Why don't we talk about it tomorrow?" After all, both of them had a drink......"

"No, no, no, let's talk now," Grigorievich hurriedly interrupted Chen Geng's words and said, "Sir, for Russians, this little wine is nothing at all. ”

"Okay,"

Since Lao Maozi doesn't care about himself, what else can Chen Geng say? You can't discourage people from working, right? "That's right, now our work has two main items, one is to smoothly produce a qualified NK-8 engine, and at the same time digest and absorb the NK-8 technology, and the second is to improve the NK-8 engine in accordance with our requirements, the improvement funds and corresponding scientific research equipment are provided by our side, and the technology is shared by our Runhua Industry and the Kuznetsov Design Bureau, both of these two know it, right?"

"Yes, we know." Grigorievich and Vlasievich nodded in unison, but both of them were a little puzzled, what did Chen Geng say about this.

"After the two of you officially take up their posts, they can choose to help us master the technology of NK-8 as soon as possible, or they can choose to help us improve the NK-8 ......."

"Sir, let me ask, is there any difference between these two jobs?" Vlasievich raised his hand and asked.

"Yes," Chen Geng nodded: "The income of transforming NK-8 is higher." ”

"Huh?" The eyes of the two old hairy men widened suddenly, and then their eyes burned and shining: Can you get more money by helping to improve NK-8?

The two old hairmen spoke in unison......

"How much more can I get?"

This is Vlasievich.

"Really?"

This is Grigorievich.

"Of course," Chen Geng nodded: "If you help improve NK-8, you can get an extra $1,500 to $2,000 a month, and there is a stage task bonus, and there will be a huge reward after each stage of the task is completed, and the reward will not be less than $10,000, as long as everything goes well, you can get at least $30,000 more per year." By the way, I add that this money is income after taxes. ”

Can I get at least $30,000 more per year? Grigorievich and Vlasievich listened to the blood: Counting the money promised by Chen Geng before, doesn't it mean that if you join this NK-8 technical improvement group, you can get at least $80,000 a year?!

The most important thing is that such a large sum of money is still after tax and can be obtained in real time, so it is even at least 50% more than what his American counterparts get, so what is there to hesitate about? Vlasievich and Grigorievich said without hesitation: "Sir, we are willing to help you improve the NK-8. ”

"Don't be busy making decisions just yet," Chen Geng waved his hand and said: "Even if you want to assist us in improving the NK-8, we cannot stop the work of assisting us in successfully completing the production of the NK-8. ”

"No problem!"

Grigorievich and Vlasievich looked at each other, and both replied at the same time.

Since they can get at least more than $30,000 a year, it is still after taxes, and it is just too natural to work more, and neither of them thinks there is anything wrong with it.

"Very good, it seems that we have reached an agreement," Chen Geng stretched out his hand and shook hands with Grigorievich and Vlasievich: "If you two don't mind, then I will briefly talk about some of our requirements for the improved NK-8, and after the two of you go back, you can sort out your thoughts and think about how to carry out the work next?" ”

Seeing the two nodding, Chen Geng said: "After discussion, our initial idea is to improve the two engines on the basis of NK-8-4, one of which is basically required to increase the maximum thrust to a minimum of 120KN, increase the engine service life to a minimum of 6,000 hours, and reduce the cruising fuel consumption rate to 0.68......."

"Sir, with all due respect," Vlasievich interrupted Chen Geng, "it is also impossible to reduce cruising fuel consumption to 0.68. ”

As the chief designer of the low-pressure compressor of the NK-8 series engine, Vlasievich had a relatively good say in this matter, so as soon as he opened his mouth, Chen Geng immediately asked: "Why do you say that?" ”

"Because the fuel consumption of the NK-8 series engine and the various derivative engines developed based on the NK-8 is relatively high, we have not thought about reducing the cruising fuel consumption of the NK-8," Vlasievich said helplessly: "But there is no way, the original design of this engine is here, and it is almost impossible to achieve a cruise below 0.7." ”

Soviet-made aero engines are notoriously high in fuel consumption, even if calculated according to the standards of the Soviet Union, the fuel consumption of Soviet-based aero engines is higher than that of European-American aero-engines, and the NK-8 series engines of the Kuznetsov Design Bureau, even among the Soviet-based engines known for their high fuel consumption, the fuel consumption is also a bit touching, otherwise the TU-154 series of civil aircraft will not be deeply improved in the later period: the TU-154M canceled the NK-8-4, and instead chose the same thrust. The D-30KU of the Soloviev Design Bureau with lower fuel consumption.

The model that canceled the NK-8 series engine because of high fuel consumption was not only the TU-154M, the most successful civil aircraft in the Soviet Union, but also the only supersonic jet civil aircraft in the Soviet Union: the follow-up improvement of the TU-144, the TU-144D, was because it could not stand the maximum afterburner fuel consumption rate of the NK-144 as high as 2.14, and instead chose the more fuel-efficient RD-36-51.

Over the years, the Kuznetsov Design Bureau has been looking for ways to reduce the fuel consumption rate of the NK-8 series engines all the time, but the NK-8 series has developed from the first generation to the NK-8-8, and even the NK-144 with afterburner has been developed, but there has always been no very good way to improve the cruising fuel consumption rate, otherwise the Kuznetsov Design Bureau would not have given up the NK-8, which had been played by them as art and a brilliant game, and turned to play NK-44 and NK- 56 and even NK-96 this ducted type propeller fan engine.

"That's right," nodding, Chen Geng suddenly asked, "What is the total boost ratio of NK-8?" ”

Vlasievich immediately said: "It's 10.8." ”

"It's too low, if I'm not mistaken, the first generation of turbofan engines made by the Americans: the total boost ratio of JT3D has also reached 16, and the NK-8 project was established in the mid-to-late 50s, when the technical conditions were limited, and the total boost ratio of 10.8 was no way, but after these years of development, it should be no problem to increase the total boost ratio, right?" Looking at Vlasievich, Chen Geng asked: "Mr. Vlasievich, to what extent do you think the total boost ratio of NK-8 can be increased under the existing technical conditions?" ”

Vlasievich pondered for a while and said: "I think it should be achievable by 13." ”

"Can it only be 13?" Chen Geng frowned, a little dissatisfied with this result.

"Sir, it is not only the technical factors during research and development that determine the total boost ratio, there are many other influencing factors in addition to technical factors, the most important of which is the bypass ratio, the bypass ratio of NK-8 is only a little more than 1, it is difficult to improve the bypass ratio, the reason why JT3D can achieve a total boost ratio of 16, Because the bypass ratio of JT3D has reached 1.4, basically, the increase between the total boost ratio and the bypass ratio is proportional, without increasing the bypass ratio on the premise, it is very difficult to increase the total boost ratio to 13, but I have to remind you that even if the total boost ratio is increased to 13, the cruising fuel consumption is basically impossible to reduce to 0.68, I personally estimate that if it is according to European and American standards, it will be good to reach 0.71. ”

In the case of a total boost ratio of 10.8, by improving the control system of the engine. Precise control of engine speed and fuel injection, NK-8-4 can already achieve a cruising fuel consumption rate of 0.71, but after the total boost ratio is increased to 13, the cruising fuel consumption rate is still 0.71?

That's right, because of one Soviet standard, the other is European and American standards.

"Understood," Chen Geng nodded: "But what if we increase the duct ratio?" ”

"Simultaneous expansion of bypass ratio? That's easy," Vlasievich immediately breathed a sigh of relief: "So how far are you going to expand the ducted ratio?" ”

Chen Gengdao: "1.4, or those requirements just now, at least 120K maximum thrust, at least 6000 hours of service life, less than 0.68 cruising fuel consumption, taking into account both military and civilian use;

The second improvement plan is to directly make the duct ratio 3 to 4, as far as possible to improve the overall life of the engine, improve the ease of maintenance, and improve fuel economy. ”

Vlasievich and Grigorievich came to the worker and froze, and for a long time, Grigorievich said softly: "1.4...... This is a standard military engine. ”

Chen Geng did not answer, but looked at Grigorievich and Vlasievich and asked, "This is what we are asking, can you do it?" ”

Grigorievich and Vlasievich did not speak, as an authority in the field of aero engines, after Chen Geng said the words "1.4" and "both military and civilian", they knew that this so-called "dual-use" engine with a duct than 1.4 is more military.

Why? Isn't NK-8, which has a duct ratio of 1.02, also mainly civilian?

Because the bypass ratio of the American JT3D engine is also 1.4, and the TF-33 engine used on the famous B-52 strategic bomber is actually the military version of the JT3D.

Military aero engines do not pursue large bypass ratios too much, and the reason for not doing this is that lower bypass ratios can allow aircraft to fly at higher flight altitudes, after all, the air at high altitude is too thin, and the air is too high to fly.

Different from civil aircraft, for military aircraft, the ceiling, that is, the maximum flight altitude is an extremely important technical index, civil aircraft can be stable at an altitude of 11,000 meters in the stratosphere, it is enough, and it is not much use to go up, and it is a waste of precious fuel, but for military aircraft, this flight altitude is far from enough, and the maximum flight altitude of 17,000 meters of B-52H can enable it to avoid the threat of a considerable number of ground-to-air missiles -- since it is military, Fuel consumption, economy, cost, etc., will not be listed as the first series of key considerations.

Transport planes, which are aircraft that carry out support tasks, have no problem flying at a lower altitude, so they can naturally use engines with large bypass ratios, but bombers and other aircraft that directly participate in combat must use engines with small bypass ratios in order to ensure their flight altitude.

Compared with the NK-8 improvement with a bypass ratio of 1.4, the second improvement scheme with a bypass ratio of 3 to 4 is nothing.

It was precisely because they understood that the first scheme could be used militarily by the Chinese that Grigorievich and Vlasievich were so silent.

"The NK-8 engine will be used by our country's H-6 bomber, that is, your TU-16," Speaking of the TU-16 bomber, Chen Geng laughed self-deprecatingly: "You Soviet government knows this, and our central government also knows this, as for this improved NK-8," Chen Geng spread his hands: "You two, you should be clear, right?" ”

Clear what?

Of course, it is clear why you can get a high salary by participating in this project, and why the Soviet Union will agree to pay the Chinese to help improve the type.

Clear what?

Of course, it is clear why you can get a high salary by participating in this project, and why the Soviet Union will agree to pay the Chinese to help improve the type.