Chapter 41 When the Black Hawk fell, only a few pieces of skin were left.
Author: Charcoal grilled bamboo shoots
Chapter 41 When the Black Hawk fell, only a few pieces of skin were left.
"It's been torn apart so much. What should I do if I have to hand it back?"
Chen Yi raised a key question.
Although the Black Hawk entered the airspace and was shot down and picked up.
But as expected, the other side's protests and requests for return have now been sent.
According to some unspoken rules between major countries.
Unless there is a complete rift, the Black Hawk will still have to return this matter after some negotiations.
This time ranges from three to five months to as long as one and a half years.
No matter what, the opponent will not let this Black Hawk, which has great strategic significance, stay outside for a long time and let others fully understand the Black Hawk's technology.
What everyone can do is to mobilize scientific research personnel as much as possible before the return date arrives.
Research and understand the technology contained in Black Hawk, while gaining more benefits at the negotiation table.
But now that the black hawk has been dissected like this, how can it be repaid?
"It's simple. The Black Hawk crashed into the sea at an altitude of tens of thousands of meters. No one except us knows how many pieces of the Black Hawk are left."
Professor Zhang explained with a smile: "We can rush over in time to help our friendly countries pick up some broken parts, which is pretty good.
But maybe, if we don’t get there in time, the Black Hawk will lose its engine and sink to the bottom of the sea.”
"Yes, the engine has "sinked" into the sea. If they talk nicely, we can help "pick up" the engine and return it.
To put it bluntly, not to mention the engine, even the main body of the Black Hawk may have sunk into the sea.
We passed slowly, and there were only a few pieces of skin left on the sea surface."
Several other professors next to me took up the conversation, with expressions you know all on their faces.
"."
Chen Yi was impressed by this operation.
Sure enough, when it comes to operation.
You still need to see a professional.
Folk players like him are obviously much worse.
Chatted for a while.
Chen Yi went over to the main body of the fuselage and carefully looked at the structural design of the fuselage and its stealth design.
Although small airplanes and large airplanes are both airplanes, their structures and designs are very different.
The structural stress, aerodynamic layout, including the load on the fuselage during acceleration maneuvers, the internal compression injection structure of the engine and other parameters involved are not as simple as scaling up.
Rather, some are proportionally enlarged, some are exponentially enlarged, and some are enlarged in shape, and aerodynamic parameters or combustion parameters need to be adjusted and reduced.
These differences are as complex as a complete redesign of an aircraft.
"It turns out that the structural design of large aircraft has higher requirements on the material strength of the fuselage due to the increase in the windward surface, and also on the lift coefficient and drag coefficient of the aerodynamic layout.
In addition, the resonance, vibration, thermal expansion and contraction of the fuselage also need to be strictly controlled."
Chen Yi studied for dozens of minutes and had a rough idea of ​​the structural design of a large ultra-high-speed aircraft.
To put it metaphorically, it is like a small piece of iron. Even if it accelerates to supersonic speed, because of its small size and simple structure, the iron sheet will not be greatly affected.
But if the iron sheet is replaced by an iron plane, because the volume increases and the structure becomes more complex, each component will bear different stresses and air resistance.
Once it reaches supersonic speed, it will collapse in an instant.
This is similar to the rocket return capsule that fails to return to the ground from space. The entire return capsule will only break into large and small pieces.
But the broken pieces will not continue to break into smaller pieces.
This is because the volume and structure are different, and the various forces endured at high speed are also different.
The same applies to thermal expansion and contraction, resonance, vibration, etc.
Chen Yi's drone is less than 2 meters in size. The body of the drone does not change much between normal temperature and the thousands of degrees Celsius temperature caused by friction at supersonic speeds.
But if it were replaced by an 18-meter Black Hawk, when flying at supersonic speeds, the entire fuselage would expand by more than 50 centimeters compared to the normal ground temperature due to the high temperature.
The gaps and fuselage deformation caused by these expansions will cause the entire fuselage to collapse at high speeds if not controlled properly.
"Xiao Chen, don't be too busy looking at the fuselage.
Look at the real core of this Black Hawk, the three-combined scramjet engine.”
Seeing Chen Yi staring at the Black Hawk's fuselage structure and studying it, Professor Zhang walked over and pulled Chen Yi over to the disassembled scramjet engine on the other side.
"What's so good about this? Didn't I give you a better rotating detonation engine?"
Chen Yi walked over and looked at the scramjet engine, which was completely scrapped because the battery had penetrated the side wall of the combustion chamber and a small half of the area had melted and solidified due to the high temperature of the combustion chamber.
He has no experience in designing large-scale aircraft.
Even if you master aerodynamic layout, engine manufacturing, aircraft design and other knowledge, you still need to re-learn and re-research.
But Professor Zhang and his group are all big guys who have designed and researched aircraft for decades.
He has led China's aircraft development process from imitation to transcendence, from import to export.
The characteristics of aircraft and engines of various sizes are almost understood by heart, and it is not enough for those with rich experience.
With the technical details of the rotary detonation engine he provided.
Even if it is just a miniaturized rotary detonation engine, I believe it will not be difficult to convert it into a super engine for large aircraft.
In this case, why study scram stamping?
Wouldn't it be better to directly rotate and detonate, and get it right in one step?
"The rotating detonation engine, which is an advanced version of the rocket engine.
Although Xiao Chen, you added a turbojet structure in your design, making it a combined turbojet + rotating detonation engine.
But in the critical airspace near the Karman Line, there is no stamping performance and scram stamping.
The engine's performance, efficiency, and adaptability are still much worse than the Black Hawk's three-combination scram engine.
Nowadays, the tactics and strategies of air combat are gradually developing towards high altitude, ultra-high speed and critical space.
Without scramjets, we will be at a disadvantage in the future."
Professor Zhang explained with a wry smile.
"Wouldn't it be enough to directly board the space fighter and occupy a higher airspace?" Chen Yi answered bluntly.
But after saying that, I realized something was wrong.
There is an obvious barrier between space and planetary space.
--atmosphere.
If you want to return from space, you must control the speed and angle accurately, otherwise you will be burned by the atmosphere.
Faced with the atmospheric obstacles of returning to the planet, no matter how cool your space fighter is, it can only be equipped with a laser and become a high-speed aircraft.
Otherwise, it would be difficult to pose any threat to combat aircraft in the atmosphere.
Realizing something was wrong, Chen Yi also started to get serious: "What is the engine combination of this Black Hawk?"
"The three combinations of turbojet + subramjet + scramjet have the characteristics and advantages of the three types of engines."
"Let me take a look."
Chen Yi walked up to the Black Hawk engine, which was much taller than himself, put on a protective mask and got inside with a flashlight, and examined it carefully.
Professor Zhang and a group of other experts and senior engineers all stood outside waiting, looking expectantly at Chen Yi who was busy inside.
We know that the Chen Yi rotary detonation engine was designed by Chen Yi, who built the moon landing drone and designed the ion propulsion drone in the atmosphere.
They all know that in the fields of aircraft design and manufacturing, engine design and manufacturing, Chen Yi's attainments are no lower than theirs.
In addition, young people have big brains and are more active in thinking.
You may not be able to see the mystery of the Black Hawk super-burning engine, and it will give you different inspirations and insights.
Chen Yi studied for a while and came out with some regret.
"The damage is too serious and we can't see the key points of this engine's three-way combination."
Before he finished speaking, everyone was suddenly disappointed.
Professor Zhang patted Chen Yi on the shoulder and comforted: "It's okay, it doesn't matter if you can't see it for a while about scientific research.
During this period, Xiao Chen, if you are free, please stay and be treated like a specially hired expert.
We will strive to develop as many key technologies as possible before the Black Hawk is returned."
"Yes, technology cannot be broken through in a short while. If a technology like scram stamping can be put into practical use within three years, I will be very happy."
"Take your time, the food in the canteen here in Rongfei is good. Let's enjoy the food slowly and study it slowly."
As if they were worried that Chen Yi would have some psychological burden, some other experts and senior engineers also quickly joined the conversation, smiling and reassuring that this matter was not urgent.
"Wait, I haven't finished speaking yet."
Looking at this group of people who were obviously feeling the most uncomfortable but were comforting themselves, Chen Yi thought for a while: "I don't know how this Black Hawk engine can achieve three combinations of super-fuel stamping.
But for the three-combination engine of turbojet + subramjet + scramjet, I do have some feasible ideas.
If the model is large enough, the rotating detonation structure can be added to design a four-combined engine, or even a five-combined turbofan."
"What!?"
"Isn't this a joke?"
Professor Zhang and a group of others were stunned and looked at Chen Yi in disbelief.
PS: 2600 words, 6000 have been updated today, so many updates during the free period are relatively small. Once it is put on the shelves, there will be 10,000 more updates every day. Finally, I would like to ask readers for follow-up reading, monthly votes and recommendation votes.
Chapter completed!