I heard that I wanted to discuss with myself how to carry out the future work, and a group of Russians immediately breathed a sigh of relief: Since I wanted to discuss with myself how to start a war, there was no need to worry about the Chinese taking any coercive measures against me.

Vlasievic and Grigorievich were even more anxious. When they came back from Dong Laishun, they didn't go back to their room at all, and just followed Chen Geng to Chen Geng's room.

"Mr. Grigorievich, Mr. Vrasievich, don't you need a rest?" Chen Geng sighed. These two Russians drank a lot while eating hot pot: "Why don't we talk about it tomorrow? After all, both of them have drunk..."

"No, no, no, let's talk now," Grigorievich quickly interrupted Chen Geng and said, "Sir, for the Russians, this little wine is nothing."

"All right,"

Since the Russians don’t care, what else can Chen Geng say? It can’t hurt their work enthusiasm, right? "That’s right, our work now has two main items. One is to successfully produce a qualified NK-8 engine, and digest and absorb the NK-8 technology. The second is to improve the NK-8 engine according to our requirements. The improvement funds and corresponding scientific research equipment are provided by us. The technology is owned by our Runhua Industrial and Kuznetsov Design Bureau. Do you know these two?"

"Yes, we know." Grigorievich and Vlasievich nodded, but both of them were a little confused. Chen Geng said what this was for.

"After the two officially took office, they can choose to help us master the technology of nk-8 as soon as possible, or they can choose to help us improve nk-8..."

"Sir, I ask, is there any difference between these two jobs?" Vlasievic asked, raised his hand.

"Yes," Chen Geng nodded: "The income from transforming nk-8 is higher."

"Huh?" The two old men's eyes suddenly widened, and then their eyes shone brightly: Can you get more money when you help improve nk-8?

The two old men spoke in unison...

"How much more can you 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 are bonuses for stage tasks. After each stage of tasks are completed, there will be huge rewards, and the reward will not be less than $10,000. As long as everything goes well, you will get at least $30,000 a year. By the way, I'll add that this money is after-tax income."

You can get at least $30,000 per year? Grigorievich and Vlasievic listened to bloodline Hui Zhang: Taking into account the money that Chen Geng promised before, doesn’t it mean that if you join this nk-8 technology improvement group, you can get at least $80,000 per year?!

The most important thing is that such a large amount of money is actually after tax, and it can be obtained in fact. In this way, it is even at least 50% more than what my American counterparts get. So what else can I hesitate about? Vlasievic and Grigorievich said without hesitation: "Sir, we are willing to help you improve nk-8."

"Don't be busy making decisions first," Chen Geng waved his hand and said, "Even if you want to help us improve NK-8 and help us complete the work of production of NK-8 smoothly, you can't stop. Simply put, it means that you have to undertake two jobs at the same time, but it's mainly about improving NK-8."

"no problem!"

Grigorievich and Vlasievich looked at each other, and they responded at the same time.

Since you can get at least more than 30,000 US dollars a year, it is still after tax, and it is too reasonable to work more. Neither of you think there is anything wrong with this.

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

Seeing the two nodding, Chen Geng said: "After discussing, our initial idea is to improve the two engines based on the nk-8-4. The basic requirement of one of them is 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 to 0.68..."

"Sir, IMHO," Vlasievic interrupted Chen Geng: "It is impossible to reduce the cruising fuel consumption to 0.68."

As the chief designer of low-pressure compressors for the nk-8 series engines, Vlasievic has a say in this matter, so as soon as he spoke, Chen Geng immediately asked: "Why do you say that?"

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

Soviet-style aviation engines are well-known for their high fuel consumption. Even according to the Soviet standards, the fuel consumption of Soviet-style aviation engines is higher than that of European and American aircraft engines. The NK-8 series engines of Kuznetsov Design Bureau, even among the Soviet-style engines, which are known for their high fuel consumption, the fuel consumption is a bit touching. Otherwise, the Tu-154 series civil aviation aircraft would not have been further improved in the later stage: the NK-8-4 was cancelled on the Tu-154m, and instead chose the D-30ku of the Soloviev Design Bureau, which has a comparable thrust and lower fuel consumption.

The models that canceled the NK-8 series engines due to high fuel consumption are not only Tu-154m, the most successful civil aviation model in the Soviet Union. The only supersonic jet civil aviation aircraft in the Soviet Union: the subsequent improved Tu-144D, because it could not stand the maximum afterburner rate of NK-144, which was as high as 2.14, and instead chose the more fuel-efficient rd-36-51. It can be said that the fuel consumption rate has always been the pain of the Kuznetsov Design Bureau!

Over the years, the Kuznetsov Design Bureau has been constantly looking for ways to reduce the fuel consumption rate of the NK-8 series engine. However, the NK-8 series has developed from the first generation to the NK-8-8, and even the nk-144 in the afterburner chamber has been created, but there has been no good solution in terms of cruising fuel consumption. Otherwise, the Kuznetsov Design Bureau would not give up the NK-8, which has been played well by them, and has turned to the NK-44, NK-56 and even NK-96 ductile paddle fan engine.

"That's it," nodded, Chen Geng suddenly asked, "What is the total boost ratio of nk-8?"

Vlasievic immediately said: "It's 10.8."

"It's too low. If I remember correctly, the first generation of turbofan engines made by Americans: JT3D has reached 16. The nk-8 project was launched in the mid-to-late 150s. At that time, the technical conditions were limited, and the total boost ratio of 10.8 was impossible. 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, how do you think the total boost ratio of NK-8 can be increased to under the existing technical conditions?"

Vlasievic pondered for a while and said, "I think it should be possible to reach 13."

"Can you only reach 13?" Chen Geng frowned, a little unsatisfied with the result.

"Sir, it is not just the technical factors during research and development. In addition to technical factors, there are many other influencing factors. The most important one is the bypass ratio. The bypass ratio of nk-8 is only a little more than 1, and it is difficult to improve the bypass ratio. The reason why jt3d can achieve a total boost ratio of 16 is because the bypass ratio of jt3d reaches 1.4. Basically, the increase of the total boost ratio and the bypass ratio is in a positive proportion. It is already very difficult to increase the total boost ratio to 13 without increasing the bypass ratio. However, I have to remind you that even if the total boost ratio is increased to 13, the fuel consumption of the battery life is basically impossible to reduce to 0.68. I personally estimate that if it is according to European and American standards, it would be good to reach 0.71."

With a total boost ratio of 10.8, by improving the engine control system and accurately controlling the engine speed and fuel injection volume, nk-8-4 can already achieve a cruising fuel consumption rate of 0.71, but after increasing the total boost ratio to 13, will the cruising fuel consumption rate still be 0.71?

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

"I understand," Chen Geng nodded: "But what if we increase the bypass ratio?"

"Simultaneously expanding the bypass ratio? That's simple," Vlasievic immediately breathed a sigh of relief: "So how much are you going to expand the bypass ratio?"

Chen Geng said: "1.4, it is still the requirements just now, with a maximum thrust of at least 120k, a service life of at least 6,000 hours, a cruise fuel consumption of less than 0.68, taking into account both military and civilian use;

The second improvement plan is to directly achieve the bypass ratio of 3 to 4, so as to improve the overall life of the engine as much as possible, improve maintenance and improve fuel consumption economy. Under this premise, there is no special time limit for everyone to do as much as possible."

Vlasievich and Grigorievich were stunned when the worker came. After a long time, Grigorievich whispered: "1.4... This is a standard military engine."

Chen Geng did not answer, but looked at Grigorievich and Vlasievich and asked, "This is our request. Can you do it?"

Grigorievich and Vlasievich did not speak. As authorities in the field of aviation engines, after Chen Geng mentioned the words "1.4" and "taking both military and civilians", they knew that this engine with a bypass ratio of 1.4, which is more of a military-civilian, is more of a military-civilian.

Why do you say that? Isn't nk-8 with a bypass ratio of 1.02 mainly used for civil use?

Because the bypass ratio of the US 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 JT3D. This engine takes into account both fuel consumption and military needs, and can almost be considered an excellent balance between the two.

Military aviation engines do not pursue large bypass ratios too much. The reason for not doing this is that a lower bypass ratio can allow the aircraft to fly at higher flight altitudes. After all, the air at high altitudes is too thin and flying too high, so there is not enough air.

Unlike civil aircraft, the maximum flight altitude is an extremely important technical indicator for military aircraft. Civil aviation aircraft can fly stably in the same stratosphere at an altitude of 11,000 meters. It is not very useful to go up. It also wastes precious fuel in vain. However, for military aircraft, this flight altitude is far from enough. The maximum flight altitude of 17,000 meters in b-52h can allow it to avoid the threat of a considerable number of surface-to-air missiles. Since it is military, fuel consumption and cost will not be listed as a key consideration in the first sequence.

For aircraft such as transport aircraft that perform support missions, there is no problem with a lower flight altitude, so you can naturally use large bypass ratio engines. However, in order to ensure the flight altitude of the aircraft such as bombers, small bypass ratio engines must use small bypass ratio engines.

Compared with the nk-8 improvement type of 1.4 bypass ratio, the second improvement solution of bypass ratio 3 to 4 is nothing.

It is precisely because of understanding that the first plan might be used by the Chinese in military use that Grigorievich and Vlasievich were so silent.

"The NK-8 engine is used for our country's Hong-6 bomber, that is, your tu-16," Chen Geng smiled mockingly: "You Soviet government knows this, our central government also knows, as for this improved NK-8," Chen Geng spreads his hands: "Two, you should know, right?"

What do you know?

Of course, it is clear why you can get a high salary by participating in this project, and why the Soviet Union agreed to the Chinese to pay for improvement.

What do you know?

Of course, it is clear why you can get a high salary by participating in this project, and why the Soviet Union agreed to the Chinese to pay for improvement...
Chapter completed!