Genius is just the threshold for me!

Chapter 109 Xu Ziming Admits

"It's done!"

Seeing the pure sky-blue glow of burning hydrogen and methane, and observing the intake air temperature consistently maintained around 24 degrees Celsius, Wang Xingguo couldn't help but cheer, his heart pounding with excitement.

Intake pre-cooling technology is a technological concept that was proposed in the 1950s.

While he was still in university in the 1980s, a massive research wave was launched in major aerospace technology laboratories around the world.

This technology was once hailed as one of the key tools to break the speed limit of jet engines and allow people to glimpse hypersonic speeds.

finally.

Due to the extreme process requirements, complex working fluid matching issues, and extreme system balance leading to frost buildup and blockage in the air intake, a series of intractable engineering problems were encountered.

People tried various solutions, but still failed to solve or circumvent this problem. This wave of research, which was hot for a few years, completely died down.

Some industry leaders have even publicly stated that humanity will not be able to solve its engineering challenges within the next fifty years.

But now, in less than thirty years, they have overcome this engineering problem that has plagued humanity for decades and opened the second phase of supersonic aircraft engine development.

"Ziming, go back and thoroughly review the relevant technical details, and prepare an internal technical journal for publication. This could change the entire domestic landscape in the hypersonic field, and even alter the landscape of other hypersonic engines."

Wang Xingguo watched for a while, then turned to Xu Ziming: "At that time, I will discuss with 624 and the others some of the advantages of this air intake precooling engineering scheme, and whether it can be applied to the Emei turbofan engine."

If successful, the combat capabilities of our J-20 fighter jets will reach a new level!

"After the actual tests are completed, we'll put it on the plane for a test flight."

"The parameters for testing and actual flight, as well as for ground and high-altitude flights, are too different right now, so the actual effect is still uncertain."

Xu Ziming looked at the stable temperature and tail flame, shook his head, and did not rush to agree.

"That works too."

Wang Xingguo nodded, took a deep breath, and controlled his excited emotions.

Although he trusted Lin Dong's skills, he also understood that opening champagne at halftime was a big no-no.

After all, as the current engine expert of Chengdu Aircraft Industry Group (CAC) 001, he is well aware that ground testing and high-altitude testing are two completely different environments.

Many engines passed on-the-ground test drives without any problems.

However, at high altitudes and high speeds, the air pressure drops and the air becomes thinner, which directly reduces the thrust significantly, forcing the entire design to be scrapped and redesigned.

"The temperature fluctuates by less than 3 degrees Celsius, so there's absolutely no risk of frost..."

Xu Ziming waited for half a minute to confirm that the engine was stable, and then began to continuously change the test parameters and the air intake angle to simulate various flight conditions as much as possible.

But seeing the data that remained consistently within the 24-degree Celsius range, fluctuating by less than 3 degrees Celsius, he couldn't help but show a hint of shock on his face.

As an expert in engineering, he knew very well what such stable parameters represented.

This represents an unparalleled level of system balance, and ultra-precise and ultra-accurate system traffic scheduling.

Regardless of changes in the intake air and working fluid, the precooling device can make corresponding adjustments instantly to ensure that the final cooled gas temperature is neither too high nor too low.

If the temperature is too high, the temperature difference between the inside and outside of the engine decreases, and the efficiency of precooling is reduced, so the profit is not enough and it is equivalent to a loss.

If the air temperature is too low, it will touch the frost point of moisture, causing the air intake to freeze and become blocked, resulting in a greater loss of air intake or even engine stalling.

The challenge of balancing this system is precisely the problem that has plagued the world for decades without a solution to the jet engine's air intake precooling technology.

Because system balance is difficult to control, if the flow rate of the pre-cooling device is greater than the intake flow rate, and the intake cooling temperature is not up to standard, it will directly cause blockage during hypersonic flight.

If the flow rate of the precooling device is less than the intake flow rate, the intake air will absorb too much heat and drop below the freezing point, causing the entire intake passage to frost and become blocked.

After all, this isn't an Otto cycle car piston engine.

The intake speed of a car engine is generally 20 meters per second, which gives the system ample time to react. Many modern cars have intake cooling technology, which can slightly improve efficiency.

Jet engines using the Brayton cycle have excessively high intake airflow.

The entire device needs to cool the gas in about 0.05 seconds, leaving less than 10 milliseconds for system adjustment.

For a program, 10 milliseconds is more than enough time.

But for a physical flow device, this is an extremely demanding timeframe.

"Since the system is so stable..."

Xu Ziming couldn't help but turn to look at Lin Dong: "You can set it to 5 to 10 degrees Celsius, which will improve the overall engine efficiency and thrust."

"Uncle Xu, there's no need."

"The real atmospheric environment is constantly fluctuating. Compared to the efficiency and thrust that can be increased by less than 1 point due to a temperature difference of more than 10 degrees Celsius, it is more important to leave a redundant temperature range to prevent frost formation."

Lin Dong shook his head and said casually, "Besides, this air intake pre-cooling technology is destined to be just an auxiliary technology. The real core is still the engine itself, so there's no need to be so meticulous."

Even with an intake pre-cooling device and the second-stage mode activated, a subsonic combustion engine still cannot compare to a supersonic combustion engine.

If it weren't for the sudden completion of the JF12 hypersonic shock tunnel in China, which gave his hot-aircraft fuselage design a super-speed boost and caused the design of the supercharged engine to lag far behind, he could only look on with envy at the completed fuselage without the engine to test fly.

This pre-cooled engine technology was simply not within his consideration.

At most, once the scramjet engine is finished, we can add it as a complementary device.

"..."

Seeing Lin Dong's nonchalant attitude and looking at his daughter's starry-eyed expression, Xu Ziming couldn't help but curse out loud.

Ma De.

This kid got fooled!

"Engine assembly."

Xu Ziming gritted his teeth twice, shut down the engine test procedure, and walked outside with a wrench in his hand.

Crack! Crack!

Xu Ziming opened the explosion-proof door, and a wave of heat left over from the test run rushed out of the test workshop, lifting the hair on Xu Ziming's forehead, revealing a fine layer of sweat under the workshop lights.

I wiped away the sweat and turned on the cooling fan for a while before the heat slowly dissipated.

Xu Ziming went into the testing workshop, reached out a few centimeters away to probe the engine casing, and after three seconds he didn't feel any heat radiation. He couldn't help but curse him as a pervert again.

This situation implies two reasons.

One is that the engine's system has a very high heat dissipation efficiency, and most of the heat from the combustion chamber is expelled along with the gas.

Another advantage is the excellent protection design of the entire engine, which prevents heat from the internal combustion chamber from being transferred to the outer casing.

But in either case, to achieve this level of performance on the first test drive without any modifications is simply extraordinary.

Xu Ziming took a deep breath, moved the engine to the hydraulic lift, walked through the dust-free passage to blow off all the dust from his body and the engine, and sent it to another assembly workshop.

Here, the brand-new Hot Hot has been assembled and is steadily suspended in the center of the cleanroom. Its silver-gray body has sharp lines and gleams with a cold light under the lamp.

Two positions were reserved under the fuselage for connecting the main fuselage and installing the twin engines.

"Final assembly is the last and most crucial step in bringing the design to fruition."

"Many real-world accident cases involve aircraft that had no design flaws but made mistakes during final assembly, leading to crashes or mid-air disintegration during test flights."

Xu Ziming washed his hands, put on gloves, pushed the engine under the machine body, and controlled the hydraulic height to insert the engine into the reserved engine position on the machine body in a suspended manner.

After carefully adjusting the positions, I used calipers to confirm that the fixing points of the two parts were perfectly aligned.

Xu Ziming glanced at Lin Dong, who was following not far behind, and steadily connected the pipelines between the engine and the chassis. Then he took the fixing bolts and pins, and a set of wrenches to begin assembling and fixing.

"For hypersonic aircraft, a fixed torque wrench must be used throughout the assembly process. Adjustable torque wrenches should not be used because their torque accuracy is relatively poor."

All wrenches, whether used or not, should be calibrated every ten days and stored at a constant temperature and humidity as much as possible. If the torque drifts, the wrench should be replaced.

The standard of this tool determines the standard of assembly. If the standard of the tool is wrong, no matter how good the assembly process is, it will still be wrong...

"Where the outer heat insulation tiles need to be riveted, the speed must be fast. Use a specially designed high-speed riveting machine to minimize high-temperature damage at the riveting joint."

"For hypersonic aircraft, any flaw, even the slightest one, in its shape will be a fatal one."

Your Hot Aircraft is still a small aircraft, relatively small in size, so the thermal expansion effect during hypersonic flight is not so obvious.

This assembly method is relatively simple, and the design doesn't need to be so complicated, but some details still need to be taken into account...

"If you're designing aircraft, you must consider practical assembly processes. Otherwise, no matter how good or advanced your design is, it's just a castle in the air if you can't consistently put it into practice..."

"In the modern technological system, if design is the limit of thinking, then materials are the limit of technology, and craftsmanship is the limit of practical implementation."

If you want to go fast, go far, and go steadily, you need to consider all three aspects. You don't need to be an expert in everything, but you must understand the situation...

Xu Ziming's movements were skillful and fast, each one crisp and efficient.

Although it was his first time assembling this hot item, the entire process and blueprints seemed to be imprinted in his mind.

At each assembly step, he would explain the details to Lin Dong, and then extend this to the overall design of the process assembly system.

Lin Dong listened attentively and did not interrupt Xu Ziming.

Because he knew that all of this experience was a summary of Xu Ziming's more than ten years of frontline work experience, and it was something he couldn't learn from books.

The white lights of the cleanroom shone on the two of them, and not a single speck of dust could be seen in the light.

The only sounds in the air were the clicks of the torque wrench tightening the bolts and Xu Ziming's unhurried explanation.

"Forest worker."

Not far away, Wang Xingguo watched Xu Ziming and Lin Dong, who were talking and listening, and then looked at Xu Qingling, who had found a stool, sat down, and watched silently without disturbing her. He then reached out and touched Lin Weiliang's arm.

"When you have time, you can ask Engineer Xu for a few drinks more often."

"...The child is still young, so you, as the leader, shouldn't cause trouble."

Lin Weiliang quickly waved his hand: "Engineer Xu only acknowledged it, he didn't accept it."

Asking him to drink now would be like provoking him... The worst part is, I can't even outdrink him!

"The more you drink, the more you should drink."

Wang Xingguo analyzed earnestly, "Look, once Engineer Xu has vented his anger on you, he won't take it out on Xiao Dong anymore. At this time, you, as his father, need to step up!"

"I, I..."

Lin Weiliang was completely dumbfounded. He thought to himself, "My name is Lin Weiliang, not Lin Pangu. I can't handle everything."

But after hesitating several times, I still couldn't bring myself to say it. All I could do was curse him in my heart... You bastard!