Chapter 42 Feeling the fear of being dominated by formulas
Author: Charcoal grilled bamboo shoots
Chapter 42 Feeling the fear of being dominated by formulas
"You should know that before the rotating detonation engine, I also played a drone that tried to sprint into space and combined the characteristics of turbojet and ramjet."
Chen Yi talked about the drone engine he used to sprint into space.
Although this engine, due to the characteristics of low-temperature heat-strengthened materials, cannot be disassembled and destroyed after being finalized, and its durability is also not good.
But this does not affect the application of the turbojet + stamping technology contained in this engine to the design of other engines.
"The engine that propels us into space?"
"Combined turbojet + stamping?"
Each expert and academician opened their eyes wide and turned to look at Professor Zhang, who had more contact with Chen Yi.
When they saw Professor Zhang nodding, everyone was speechless.
The emotional rotary detonation engine is not the key, nor is the ion-propelled drone in the atmosphere.
Prior to this, there had already been a super engine with a turbojet and ramjet combination.
"I remember that your engine uses special stress materials.
Previously, the confidentiality department secretly purchased a few units and even 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, this engine was temporarily shelved because of the lunar landing drone."
Professor Zhang recalled the information about this engine.
"I know this.
But what I want to talk about now is the internal aerodynamic layout of this engine.
This layout and structure are the key to combining the characteristics of turbojet and stamping."
Chen Yi took the paper and pen next to him, drew a special turbine blade structure, and then marked the fluid formulas and aerodynamic parameters next to it.
Regarding the engine that sprints into space, Chen Yi has read the technical information before.
It's just that at the beginning, I can only copy the cat and the tiger, knowing it but not knowing why.
Until he read information about other aerodynamic layouts and rotary detonation engines, and conducted in-depth research on aircraft, engines, aerodynamic layouts and other fields through virtual learning.
It was only then that Chen Yicai truly understood the secret of the sprint space engine.
This is an engine technology that breaks through the barriers between turbojet and ramjet and can realize the combination of turbojet and ramjet.
If you study aircraft engines deeply enough, you can integrate the variable cycle engine that combines turbofan and turbojet, and the rotating detonation engine.
It is even possible to create an engine that combines the characteristics of a turbofan + turbojet + subramjet + superramjet + rotating detonation, and designs and manufactures an all-weather, all-airspace, ground-air-star trinity engine.
Professor Zhang and a group of others gathered around.
Chen Yi only glanced at the turbine blades he drew, and focused on the parameters and formulas next to them.
For the big guys, hand-drawn picture information is not accurate. The real key depends on the parameters and formulas.
"This is the aerodynamic parameters and air fluid formula of the turbine fan blade?"
After studying for a while, Professor Zhang came up with his own opinion somewhat uncertainly.
Not sure, this is because the above parameters are aerodynamic parameters, and the formulas are also related to fluid equations.
But as an expert in aircraft design and engine design with some in-depth research on fluids, he had never seen the content of this formula.
"It is indeed a fluid formula, and it is a brand new fluid formula."
At this time, an academician next to him who had studied fluid mechanics more deeply took up the conversation and confirmed the answer to the fluid formula.
"Yes, this is a brand new aerodynamic fluid formula.
The turbine blades next to it are special turbine blades manufactured based on this formula.
Of course, I am not a painting major and my hand-drawn drawings are not accurate.
I will briefly explain the function of this formula and the structural function of turbine blades."
Chen Yi nodded, picked up the pen and added details of the formula while explaining.
"We all know that a turbine engine uses blades to compress and supercharge the engine's intake airflow.
Ramjet engines use a shrinkable ramjet structure to compress and supercharge the engine's intake air flow.
But is it possible that turbine blades can turn into special stamping structures under specific conditions, thereby realizing a combination of turbine and ramjet engines?”
"This is impossible!"
"I've never heard of anything like this!"
As soon as Chen Yi finished speaking, a group of experts around him couldn't help shouting.
"nothing is impossible.
We have not yet explored all the mysteries of the fluid continuity equation of aerodynamic fluid mechanics, the NS equation."
Chen Yi replied calmly: "For these areas that have not been thoroughly studied and there are still many unknown areas, 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 Chen Yi well, did not doubt Chen Yi's words.
Looking at the details of the formula that Chen Yi added, he thought for a while and said: "You mean, through a special aerodynamic layout and blade structure.
When the intake airflow reaches the turbojet limit of Mach 3.
The structure of the turbine blades will adjust and change adaptively, forming a shrinking and concave stamping structure?
Will the original turbojet engine structure become a ramjet engine structure?"
"Yes, but there is no requirement to have Mach 3.
If certain adjustments are made to the blade structure.
This value can also be changed from Mach 3 to Mach 0.9, and if the intensity is sufficient, Mach 5 will also work."
Chen Yi nodded.
Mach 0.9 is the dividing point for turbofan engines. Beyond Mach 0.9, the efficiency and performance of the turbojet structure will surpass that of the turbofan.
Mach 3, this is the dividing point of turbojet engines.
Beyond this dividing point, the supersonic intake air will not reach the combustion chamber, and the turbine blades will burn prematurely 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 engine.
As for Mach 5, this is the boundary between sub-fuel ramjet engines and scramjet engines.
"Such a structure has very high requirements on materials."
An expert academician who has a deep research on materials frowned after making some mental calculations.
In the original ramjet engine, the stamping structure was a wall of iron sheets.
But now it has to be replaced by 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, you don’t need to test it. You can understand how high the requirements for materials are by just imagining it.
"The strength of the material really needs to be improved.
However, because this structure is not a fully stamped structure, it does not rely entirely on structural hard resistance.
Instead, there is an outer duct formed by the tiny gap between the blades and the side wall of the engine, and a compression main duct formed by the inward contraction of the center. The pressure between the two ducts maintains the stability of the structure.
In this way, the material strength can be increased by 5 to 8% for sub-stamping and 10 to 15% for scram stamping to meet the demand."
As Chen Yi spoke, he didn't find the blackboard and directly wrote down rows of parameters and calculation formulas on the wall with a pen to prove his description.
In this world, except for those love words that promise each other and are too scared to go out after a breakup.
No other description can be more demonstrative and authoritative than mathematical formulas.
"."
Next to him, he looked at Chen Yi's behavior of writing formulas when he disagreed.
Professor Zhang and other experts and academicians looked at each other, and their eyes couldn't help but reveal a bit of helplessness and nostalgia.
This feeling is like when I was young and studying with a tutor in college.
At that time, the instructors on the podium were also like this, throwing away formulas whenever they disagreed.
The densely packed formulas tortured them, a group of young newcomers at that time, to the point of ecstasy and pain.
Unexpectedly, decades have passed.
They have all become experts, professors, academicians and senior engineers, and have become the new pillars of the country's scientific research field.
I can also relive the feeling of being dominated by my mentor's formula back then.
More than an hour passed and Chen Yi finished writing.
Two hours have passed, three hours have passed, five hours have passed
It took more than five hours.
Through these formulas, Professor Zhang and others finally understood the plan described by Chen Yi.
To simply understand, this is like a compression fan blade that can adapt to the wind speed independently.
If the wind blowing to the fan blades is relatively small, the fan blades will maintain the structure of the fan blades and compress and pressurize the wind blowing through the rotation of the fan blades.
If the wind blowing is too strong, the fan blades will split at the center to form a concave contraction channel. With the help of the contraction channel structure, the blowing wind will be compressed and pressurized.
But the fan blades need to rotate.
There must be a gap between the fan blade and the surrounding side walls.
When the center of the fan blade splits to form a compression channel, this gap will form 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 airflows on both sides are 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 crack when the airflow is Mach 0.9, Mach 3, or Mach 5?
Should we design one-stage fan blades, two-stage fan blades, or three-stage fan blades? What is the difference in the splitting speed of each fan blade?
These different fan blade designs and corresponding cracking speeds are the key points in combining the performance characteristics of various engines such as turbofan, turbojet, subramjet, and superramjet.
Of course, this is just a basic principle.
If you want to realize such a structure in an engine, you can understand the difficulty just by looking at the formulas written by Chen Yi on a wall of dozens of meters.
It’s like telling you how difficult this principle is to implement.
You blow up a balloon, then release the mouth of the balloon, and the balloon flies away.
Okay, you already understand the principle of thrust produced by jets. Please design a supersonic fighter independently.
"Okay, don't watch anymore."
Professor Zhang broke away from Chen Yi's ocean, took a deep breath, and said to everyone.
"We need to notify the security department first to take pictures of these formulas and keep them top secret."
"Where is this wall?"
"Push it, melt it, make it into glass, break it into pieces and bury it deeply."
Professor Zhang rubbed his swollen head tiredly and turned to give Chen Yi a thumbs up.
"Well done, boy."
"You are probably the only one in the world who can make us old guys recall our school days and feel the fear of being dominated by formulas again."
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Chapter completed!