Luo Jia explained to the general on the phone that the ultimate test of space plan is cost-effective, and it depends on who can transport the goods to space at a lower price.

While the thrust of Russia's rd-171 engine has historical thrust, the cost has also reached a record high, which is exactly the same as the Russians' characteristic of being very enthusiastic about success.

Luo Jia is a science and engineering man, a data-oriented believer who values ​​truth from facts. Under his leadership, Xingchen Technology's rockets are designed completely according to the needs. The rocket engines are designed as much as the thrust they need.

Besides, Luo Jia has the habit of hiding everything, and this time is probably no exception. No one can guarantee that there are no amazing secrets hidden in the design of the Star Rocket engine.

For Luo Jia, Russia's Yenisei super heavy rocket has only one function, which is to be cannon fodder, attracting real opponents to this space race, and quickly consume their opponents' strength.

...

Under Star Technology, Rocket Laboratory.

Luo Jia has been in charge of the Rocket Laboratory for several months, and all plans are advancing at an extremely fast speed. It seems that everything is moving in the right direction, and the only exception is the injection combustion system.

For several days, the Rocket Laboratory was filled with sorrow and mist, and everyone seemed to be under great pressure. Luo Jia's office was full of white boards, with secret, extremely complex formulas and numbers written on them.

Apart from taking a shower and going to the bathroom, Luo Jia almost never leaves the office. He is like a high-speed machine, working crazy and continuously at high intensity.

His condition made everyone in the laboratory nervous. After all, Luo Jia is the leader of the tough guy group. If there is a problem with him, it will be an irreparable loss for the entire company and even the entire China.

So everyone discussed and invited Vice President An Ran to invite him to persuade Luo Jia, but they were surprised to find that An Ran was also a lunatic, just like Luo Jia!

For a full forty-eight hours, the two of them stayed in the office, constantly discussing and analyzing. They were rare geniuses in the world, and their brains were extremely fast.

Everyone was so stupid when they heard An Ran and Luo Jia arguing in the office. The two of them jumped back and forth in different disciplines. They were discussing thermodynamics just now, but they jumped to aerodynamics in the blink of an eye.

In short, it means to spend a lot of brains. It’s okay to follow their thinking for a few minutes. If it takes more than fifteen minutes, the brain will become chaotic. If it takes more than half an hour, the headache will break, and it will reach an hour. That’s hell and will drive people crazy.

So, things changed from Luo Jia's own heart to him and An Ran...

An Ran stayed in the Rocket Laboratory, and the heads of major project teams of the hardware department stopped doing it. He blamed his colleagues in the Rocket Laboratory, why did he ask An Ran to persuade Luo Jia? Anyone who is familiar with President Luo knows that he never listens to advice.

In short, the colleagues at Rocket Laboratory finally had a great enlightenment and understood that there was a reason why Luo Jia and Anron could stand at the top of the company. They were not only smarter than most people, but also worked harder!

Can the two bosses work sleeplessly? Is the injection combustion system really that important for a rocket?

The answer is yes.

As rocket fuel continues to be updated and replaced, keeping the injection system stable is becoming increasingly difficult.

Not to mention the latest generation of liquid oxygen methane engines, even the previous generation of liquid oxygen liquid hydrogen engines, it has also brought huge trouble to scientists. Luo Jia plans to save extreme costs and allow the engine to be reused unlimitedly. In this way, the requirements for durability and stability will be higher.

"Next, you can continue to improve your thinking. I'm going back. After all, the hardware department is also busy, and I don't have time to accompany you for a long time." An Ran scratched her hair that had already turned into a chicken coop and said to Luo Jia.

"I understand, don't just focus on work. Stay with your wife and children when you have time. Don't worry about not knowing you, the father, in the end." Luo Jia joked.

"Come on." An Ran waved his hand disapprovingly, "You bachelor, have you taught me a lesson as a father? Let's talk about it when you have a wife and children."

What does this have to do with being single?

His single dog is really unrighteous. He is obviously talking good things, but no one is willing to listen.

Luo Jia shook her head and muttered in her heart.

...

The reason was unclear, and the in-depth discussion with An Ran made Luo Jia change his mind again. He wiped all the whiteboards in the office and started over. Soon, the numbers and formulas on the blank whiteboard were denser again.

He is calculating tr instability, namely Taylor instability, the interface between two fluids of different densities is unstable. In the gravity field, when the heavier fluid is above the lighter fluid, instability may occur.

When the rocket engine jet is injected, the acceleration effect causes the propellant to cavitate in the pipeline, and the bubbles after the cavitation will induce compressible Taylor instability.

In addition, the propellant flows at high speed in the centrifugal pump and pipelines, and cavitation will also occur. The bubbles generated by the cavitation release pressure instantly during the jet injection. Assuming that the centrifugal pump will cause cavitation in its working state, it will be fatal and must be completely eliminated.

In addition to Taylor instability, rocket jet devices must also take into account rm instability, i.e. turbulent instability.

Regardless of the tangential velocity gradient or normal acceleration, the essence will produce disturbance waves on the fluid interface. A small number of disturbance waves propagate at supersonic speed and become shock waves. When the fluid interface with initial disturbance is impacted by the motion shock wave, the peaks and troughs of the interface will produce velocity differences, which will promote the evolution of disturbances, ultimately causing turbulence and bringing huge hidden dangers.

In short, the design of a rocket engine is extremely difficult, and a low-cost engine with an extremely stable performance and can be used repeatedly for a long time is not a huge problem, but it is extremely difficult!

For example, during the fuel injection process of rocket engines, the atomized medium is regenerated and cooled through the nozzle wall, and becomes gas and then ejected out of the pipe port. At this time, the injection speed often interacts with the oscillation exceeding the speed of sound and velocity, which inevitably leads to shock waves, and even superimposes the interference with the expansion waves.

For example, in free space, the pressure disturbance caused by shock waves and combustion will freely spread into the environment. In a closed sound cavity like a combustion chamber, shock waves and pressure waves will inevitably refract when encountering the engine wall, which often leads to unstable high-frequency combustion.

Anyway, there are too many factors that will cause instability. The aerospace industry has gathered the smartest brain in the world, but disasters still occur one after another. It can be seen that the most difficult thing about rockets is not to create it, but to truly achieve stability and security. This is not even North America and Russia, which are the most experienced, cannot do it.

The numbers and formulas became more and more complicated, and in the following days, they gradually became simplified. In the end, there was only a large whiteboard left in the office, which read the result that Luo Jia had obtained in the past ten days of exploding liver. The name of this result is.
Chapter completed!