Of course, Chen Geng couldn't admit it, so he simply said: "No! ”

"Really?" Mao Donghai looked at Chen Geng suspiciously, if Chen Geng didn't refuse so simply, it would be fine, but Chen Geng refused so simply, Mao Donghai became suspicious, and the cunning Mao Donghai immediately said with a smile on his face: "Brother, what is the relationship between the two of us?" You're still hiding this from me? Tell me, what are you going to do? ”

"Really?" Even if Chen Geng was stupid, it was impossible to tell Mao Donghai that we were going to study the tailless flying wing aerodynamic structure and the corresponding flight control technology, and said with a firm face: "Mr. Mao, you don't want to think about it, if there is no financial support, policy and human resources coordination from the state, which company has the ability to develop an aircraft alone?" ”

This is also, unless it is the development of single-seat sports aircraft, or spraying pesticides agricultural aircraft and other low-tech aircraft, otherwise any aircraft is not a company can play alone, which requires the cooperation of dozens or hundreds of supporting enterprises, so there will definitely be news. www.biquge.info If Runhua Industry really wants to develop an aircraft by itself, it is impossible for there to be no rumors at all.

But the truth is such a truth, Mao Donghai always felt that something was wrong, and he tentatively asked again: "Really?" ”

"Why am I lying to you?"

"Then what do you want an expert in pneumatics?" Mao Donghai asked suspiciously: "Even if you want to make a talent reserve for the NK-8 engine, you should be looking for talents in fluid mechanics and combustion, right?" ”

"Doesn't aero engines need to study aerodynamics?" Chen Geng asked rhetorically.

"Uh...... All right. Mao Donghai was speechless, don't look at the surface of the aero engine is full of various pipelines, but in fact, this thing pays more attention to aerodynamics than an airplane, as for what is Chen Geng's idea...... Forget it, there will be a time when the fox's tail will be exposed in the future.

However, since it was said that the aero engine was mentioned, Mao Donghai mentioned it in passing: "We will now have a preliminary discussion on the issue of reissuing the H-6, do you want to hear about it?" ”

"Oh? You said. Chen Geng nodded, he was also a little curious about what kind of result the experts of Xifei would discuss.

"The preliminary result of the discussion was that the bypass ratio should be better controlled at 1.4, and on the basis of a slight increase in thrust, fuel consumption must be reduced to less than 0.7......"

"Mr. Mao, you're not kidding, are you?" Before Mao Donghai's words were finished, Chen Geng jumped up: "The 1.6 bypass ratio can't achieve cruising fuel consumption below 0.7, and your 1.4 bypass ratio requires fuel consumption below 0.7, well, you have to increase thrust?" Mr. Mao, your request is a bit excessive. ”

"Chen Dong, don't be in a hurry," Mao Donghai said with a smile: "You think it's difficult, it doesn't mean that Lao Maozi also finds it difficult, after all, Lao Maozi developed the NK-8 in the early 60s, which is almost 30 years, and I don't know how much technology has improved -- you know the TU-144 supersonic passenger plane that Lao Maozi built, right?" ”

Although he didn't know why Mao Donghai suddenly jumped onto the TU-144 supersonic airliner, Chen Geng still nodded: "Of course, the two supersonic airliners with the same name as the Concorde supersonic airliner, how could I not know?" But what does this have to do with the NK-8 that we want to improve? ”

"What if I told you that the NK-144 engine used on the TU-144 was actually based on the NK-8 engine with some improvements and an afterburner?"

"Really?" Chen Geng was a little surprised: The engine of Lao Maozi's TU-144 passenger plane was slightly repaired and modified on the basis of the NK-8, and then an afterburner was added? Lao Maozi's system integration ability is inevitably too strong, right?

"Pretty good, isn't it?" As if knowing what Chen Geng was thinking, Mao Donghai nodded: "They have made few improvements, that is, they have changed the mechanical hydraulic control system of NK-8 to analog fly-by-wire, but it is such a small improvement that has reduced the fuel consumption of NK-144 without afterburner from 0.79 to 0.71, you know, whether it is NK-144 or NK-8, the duct ratio of 1.04 has not changed." ”

Speaking of which, Mao Donghai is also full of admiration for Lao Maozi's ability: Lao Maozi's ability in system integration and optimization is indeed a mess of Niu X.

Chen Geng was already dumbfounded when he heard it!

What started the development of the TU-144 supersonic airliner? 60s! If what Mao Donghai said is true, more than 20 years ago, Lao Maozi just replaced the flight control system, and reduced the cruise fuel consumption of the same engine from 0.79 to 0.71, then now more than 20 years have passed, if the flight control system is replaced from analog telex to digital telex, the bypass ratio is increased from 1.04 to 1.4, and then the combustion chamber, fan, compressors at all levels and so on are re-optimized, to what extent can the cruise fuel consumption of NK-8 be reduced?

Chen Geng felt that there was too much to say, at least the cruising fuel consumption of about 0.68 was still guaranteed, right? A few years later, the D-30KP-2 engine used in the H-6K had a cruising fuel consumption of only 0.71 -- well, was it 0.71 or 0.72? I can't remember exactly, it's either 0.71 or 0.72 anyway.

After a long time, Chen Geng finally spoke: "You mean, for the Kuznetsov Design Bureau, it is not difficult to expand the duct ratio of the NK-8 from 1.04 to 1.4, and increase the maximum thrust a little while reducing the fuel consumption of the cruise?" ”

"It's definitely not hard!" Mao Donghai nodded affirmatively: "NK-8 The engine has great potential for improvement, according to our analysis, in the case of a bypass ratio of 1.4 and a cruising fuel consumption of 0.68, this engine can achieve a thrust of about 130KN, of course, if you want to reach this level, there will be more sacrifices in other aspects, especially the overall life."

Speaking of the overall life, I almost forgot that the overall life of the NK-8 is 6,000 hours, and the life of the improved engine is at least maintained at this level, which can only be increased, not decreased. ”

Chen Geng felt the urge to scold his mother when he heard this: "Mr. Mao, you really think that I opened the Kuznetsov Design Bureau, I can make a request as much as I want, and the other party only racks his brains to help me complete it?" ”

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PS: Sorry brothers, this chapter is only 2000 words, and the 1000 words I owe to you will be made up tomorrow.