This civilization is very strong, but the technology tree is a bit crooked.

Chapter 42 Feeling the Fear of Being Dominated by Formulas
"You should know that before the rotary detonation engine, I also played a drone that tried to sprint into space, combining turbojet and ramjet characteristics."

Chen Yi talked about the drone engine he used to sprint into space.

Although this engine, due to the characteristics of the low-temperature heat-reinforced material, cannot be disassembled and destroyed after being shaped, and its durability is not good.

But this does not affect the application of the turbojet + ram technology contained in this engine to the design of other engines.

"Engine for sprinting into space?"

"A combination of turbojet + stamping?"

All the experts and academicians stared wide-eyed, and turned to look at Professor Zhang who had more contact with Chen Yi.

After seeing Professor Zhang nodding along, everyone was speechless.

Emotional spin detonation engines are not the point, nor are ion-propelled drones in the atmosphere.

Prior to this, there was already a super engine with turbojet ramjet twin combination.

"I remember that this engine of yours uses special stress materials.

Previously, the security department secretly purchased a few units, and went to Yifei's factory to investigate. You also know this.

I also studied it for a while, but because the stress material could not be disassembled for research, and because of the moon landing drone, this engine was temporarily shelved. "

Professor Zhang recalled the intelligence of this engine.

"I know about this.

But what I'm going to talk about now is the internal aerodynamic layout of this engine.

This layout and structure is the key to combining the characteristics of turbojet and stamping. "

Chen Yi took the paper and pen beside him, drew a special turbine blade structure, and then marked the fluid formulas and aerodynamic parameters one by one next to it.

Regarding the engine for sprinting into space, Chen Yi had read the technical information before.

It's just that at the beginning, I could only draw pictures of cats and tigers, knowing it but not knowing why.

Until he read information about other aerodynamic layouts, rotating detonation engines, and conducted in-depth research on aircraft, engines, aerodynamic layouts and other fields through virtual learning.

Chen Yicai really understood the mystery of the sprint space engine.

This is an engine technology that breaks through the barrier of turbojet and ram, and can realize the combination of turbojet and ram.

If the aircraft engine research is deep enough, the variable cycle engine combined with turbofan and turbojet, as well as the rotary detonation engine, will be integrated.

It is even possible to create an engine that combines the characteristics of turbofan + turbojet + sub-ram + super-ram + rotary detonation, and design and manufacture an all-weather, all-airspace, ground-air-star trinity engine.

Professor Zhang and a group of people surrounded him.

Chen Yi only glanced at the turbine blades drawn by Chen Yi, and then focused on the parameters and formulas next to him.

For the big guys, the hand-painted picture information is not accurate, and the real key depends on the parameters and formulas.

"This is the aerodynamic parameters and air fluid formula of the turbo blade?"

After researching for a while, Professor Zhang expressed his opinion somewhat uncertainly.

Not sure, this is because the above parameters are aerodynamic parameters, and the formula is also a formula related to the fluid equation.

However, as an expert in aircraft design and engine design, he has never seen the content of this formula.

"It is indeed a fluid formula, or a brand new fluid formula."

At this time, an academician next to him who had a more in-depth study of fluid mechanics took up the conversation and affirmed the answer to the fluid formula.

"Yes, it's a whole new aerodynamic fluid formula.

The turbine blade next to it is a special turbine blade manufactured according to this formula.

Of course, I am not a painting professional, and the hand-painting is not accurate.

I will roughly dictate the function of this formula and the structural function of the turbine blade. "

Chen Yi nodded, picked up the pen and explained the details while adding the details of the formula.

"We all know that a turbine engine uses blades to compress and boost the intake air flow of the engine.

The ramjet engine, on the other hand, compresses and supercharges the intake air flow of the engine through a shrinkable ramjet structure.

But is there a possibility that the turbine blades can become a special ramjet structure under certain conditions, so as to realize the combination of turbine and ramjet engine? "

"This is impossible!"

"I've never heard of it being like this!"

As soon as Chen Yi finished speaking, a group of experts around couldn't help shouting.

"nothing is impossible.

The fluid continuity equation of aerodynamic fluid mechanics, the NS equation, we have not studied all the mysteries. "

Chen Yi replied calmly: "For these fields that have not been thoroughly studied and there are still many unknown states, nothing is impossible.

Now this formula is the fluid continuity equation, a new supplement to the NS equation, and a new mystery. "

Professor Zhang, who knew a lot about Chen Yi, did not doubt Chen Yi's words.

Looking at the details of the formula added by Chen Yi, he thought for a while and said, "You mean, through the special aerodynamic layout and blade structure.

When the intake air flow reaches the turbojet limit of Mach 3.

The structure of the turbine blade will be adjusted and changed adaptively, forming a shrinking and concave stamping structure?

The original turbojet engine structure has become a ramjet engine structure? "

"Yes, but Mach 3 is not mandatory.

If some adjustments are made to the structure of the blade.

This value can also be changed from Mach 3 to Mach 0.9. If the strength is sufficient, Mach 5 will do. "

Chen Yi nodded.

Mach 0.9 is the cutoff point for turbofan engines. If it exceeds Mach 0.9, the efficiency and performance of the turbojet structure will surpass that of the turbofan.

Mach 3, this is the demarcation point for turbojet engines.

Beyond this demarcation point, the supersonic intake air does not wait to reach the combustion chamber, and the turbine blades will be pre-combusted due to excessive compression, causing the engine to stall.

Therefore, the speed limit of a conventional turbojet engine is Mach 3.

Above Mach 3, this must be replaced by a ramjet.

And Mach 5, this is the boundary between the sub-combustion ramjet and the scramjet.

"Such a structure has high requirements on materials."

An expert and academician who has deep research on materials couldn't help frowning after making some calculations in his mind.

The original ramjet engine, the ramjet structure is a wall of iron sheets.

But now it has to be replaced with iron sheets one by one, and then a wall is formed through the structure between the iron sheets, and at the same time, it must have the strength of the wall.

With such a design, there is no need to experiment, but only imagination can understand how high the requirements for materials are.

"The strength of the material does need to be improved.

However, because this structure is not a full stamping structure, it does not rely entirely on structural resistance.

Instead, the outer duct is formed by the small gap between the blade and the side wall of the engine, and the compression main duct is formed by the inner contraction of the center. The pressure between the two ducts maintains the stability of the structure.

In this way, the strength of the material can meet the demand if the sub-stamping is increased by 5 to 8%, and the scram pressing is increased by 10 to 15%. "

As Chen Yi said, he couldn't find the blackboard, so he directly wrote down lines of parameters and calculation formulas on the wall with a pen to prove his description.

In this world, except for those love words that Lei Tian dare not go out after breaking up with each other.

No other description can be more demonstrative and authoritative than a mathematical formula.

"."

Next to him, he watched Chen Yi's act of writing a formula when he disagreed.

Professor Zhang looked at each other with other experts and academicians, and his eyes couldn't help showing a bit of helplessness and nostalgia.

This feeling is like when I was young, when I was studying with a tutor in college.

At that time, the instructors on the podium were also like this, throwing away the formula if they disagreed.

The dense formula tortured them, a group of Xiaomengxin at that time, to the point of death and pain.

Unexpectedly, decades have passed.

They have all become experts and professors, academicians and senior engineers, and have become the new pillars of the national scientific research field.

I can also relive the feeling of being dominated by the mentor's formula back then.

After more than an hour, Chen Yi finished writing.

Two hours passed, three hours passed, five hours passed
It took more than five hours.

Through these formulas, Professor Zhang and others finally understood the scheme described by Chen Yi.

Simply understood, this is like a compressed fan blade that can independently adapt to the wind speed.

If the wind blowing to the fan blade is relatively small, the fan blade will maintain the structure of the fan blade, and the blown wind will be compressed and boosted by the rotation of the fan blade.

If the blowing wind is too strong, the fan blades will split at the center, forming a concave shrinking channel, and the blowing wind will be compressed and boosted with the help of the shrinking channel structure.

But the fan blade will rotate actively.

There must be play in the sidewall around the fan blade heel.

When split in the center of the blade to form a compression channel, this gap creates an outer channel.

The pressure balance between the two channels further maintains the structural balance of the compression channel.

This is like an object sandwiched between two airflows. As long as the airflow on both sides is not unbalanced, the object in the middle will naturally be as stable as possible.

Among them, the aerodynamic design and structural design of the fan blade can be determined.

Does the fan blade split at Mach 0.9 of the airflow, or at Mach 3, or at Mach 5.

Whether to design one-stage fan blades, two-stage fan blades, or three-stage fan blades, the splitting speed of each fan blade is different.

These different fan blade designs and corresponding cracking speeds are the key points to combine the performance characteristics of various engines such as turbofan, turbojet, sub-ram, and super-ram.

Of course, this is just the basic principle.

If you want to realize such a structure in the engine, you can understand the difficulty just by looking at Chen Yi's formula written on a wall of dozens of meters.

From the principle to the difficulty of realization, it is like telling you.

You blow up a balloon, then let go of the balloon, and the balloon flies away.

Well, you already understand the principle of jet generating thrust, please design a supersonic fighter yourself.
"Okay, don't even look at it."

Professor Zhang broke free from Chen Yi's sea of ​​formulas, took a deep breath, and said to everyone.

"We need to notify the secrecy department first, and take pictures of these formulas for top-secret preservation."

"What about this wall?"

"Push it, melt it, make it into glass, break it and bury it deep."

Professor Zhang rubbed his swollen head wearily, then turned his head and gave Chen Yi a thumbs up.

"Good boy."

"All of us old guys can recall our school days and feel the fear of being dominated by formulas again. You are probably the only one in the world."

PS: Ask for follow-up, ask for monthly tickets and recommendation tickets.

(End of this chapter)