Chapter 177 The formula I derived is different from the one in the book

The issue of rocket engine cooling may seem simple, but the things involved are quite complex.

The internal temperature of a rocket liquid engine can reach about 3500K.

In addition to high temperatures, there is also a high-pressure environment inside the rocket liquid engine.

The general thrust chamber structure cannot withstand such a harsh environment.

Therefore, various thermal protection measures need to be introduced in the thrust chamber of the rocket engine.

How to quickly cool down the interior of the engine is a very important issue.

For liquid engines, the more commonly used cooling methods include regenerative cooling, liquid film cooling, radiation cooling, etc.

If it is a high-thrust liquid rocket engine, liquid film cooling is generally used together with regenerative cooling.

For high-altitude orbit attitude control engines, liquid film cooling is the main cooling method.

Therefore, the liquid film cooling system is a problem that Xu You must solve.

Xu You turned on the deep learning state, increased the efficiency of the brain to the highest level, and started the extremely fast thinking mode.

Soon, Xu You clarified his thoughts and determined the main problems he needed to solve at present.

Although liquid film cooling is now a technology widely used in rocket liquid engines.

But it also has its own problems and limitations.

When the coolant is injected into the wall of the thrust chamber, the mixing ratio in the near-wall area of ​​the thrust chamber will seriously deviate from the optimal mixing ratio.

As a result, part of the propellant will not be able to effectively participate in combustion, resulting in a loss of thrust chamber performance.

"First construct a physical model and calculate the key data in it."

Since Xu You decided to redesign it himself, he definitely couldn't just copy it completely based on his previous experience.

Xu You needs to give his own unique understanding while referring to historical experience.

Including all the key data, Xu You needs to calculate it himself to ensure that he can draw the most accurate conclusion.

Xu You first calculated the thickness of the liquid film on the wall when the jet hits it, and the data on the flow distribution.

Regarding this issue, Xu You needs to construct a physical model by himself first, and then perform calculations.

"It feels a bit like doing physics competition questions." Xu You sighed.

Xu You must admit that his experience in participating in physics competitions was indeed very meaningful.

Not only did it help me get admitted to Jida, but in some scientific research work, many methods and techniques for solving practical problems will also be used in physics competition knowledge.

According to the conditions, Xu You established a flat plate liquid film thickness distribution model on the draft paper, marked the symbols used, and established the corresponding coordinate system.

After the model is established, the problem of column calculation remains.

Soon, Xu You derived two functions related to the flow azimuth angle φ.

Through comparison, Xu You found that his derivation results in this part were consistent with those of other previous researchers.

This feeling is like checking the answer after completing the question and finding that the result is consistent with the standard answer.

For Xu You, this is a normal thing.

But in Xu You's heart, he was vaguely expecting that he would be able to make some differences from the conclusions of his predecessors.

After all, there is never a "standard answer" to scientific research questions.

Only by surpassing the conclusions of predecessors can we make a breakthrough in this direction.

Of course, the research results in books and papers are not so easy to overturn.

After some calculations, Xu You found that all the data and formulas were consistent with the above.

"Huh? Wait a minute!"

At this time, Xu You suddenly discovered.

On the theoretical expression of liquid film flow distribution.

The formula I derived turned out to be somewhat different from the formula in the data.

Xu You did not feel excited immediately, but first checked his derivation process to see if there were any problems in it.

After all, no matter what level of academic master you are, when your results are different from the standard answer, you cannot immediately think that the standard answer is wrong.

No matter how confident you are in yourself, you definitely need to confirm it again.

"My derivation is indeed correct."

Xu You carefully checked his derivation process several times and confirmed that there were no problems.

But when Xu You analyzed the formula derivation process in the data, there was no problem.

"It turns out that it's because I considered one more jet parameter in it."

In the original formula, this jet parameter does not appear.

Xu You feels that it is not that the jet parameters are meaningless.

It’s just possible that the impact of this jet parameter is too small and is simply ignored.

Xu You also did not decide how much impact this jet parameter would have on the results, and whether it should be ignored.

But Xu You remembered the error problem that occurred the last time he helped Wang Xiangwu solve the problem of quantum phase transition.

It is just an approximation process with a negligible error. After amplification, it can also have a greater impact on the results.

Therefore, Xu You decided to reserve his opinion on this issue for now.

After that, Xu You spent half a day completing the analysis of the entire problem, including the derivation of various formulas.

"Sure enough, in the subsequent data processing, there is also amplification processing!"

After careful thinking and analysis, Xu You noticed that this problem was similar to Wang Xiangwu's last experimental subject.

If this jet parameter is not ignored, the data results obtained will be more accurate.

And this is likely to be the key to designing a new liquid film cooling system.

Next, the entire cooling process is simulated through software simulation.

Xu You once again felt the importance of informatics.

Although there must be certain errors between the results of software simulation and actual experiments.

But as long as the accuracy of the simulation is high enough, this is definitely a much more efficient method than actual experiments.

Through software simulation, Xu You completely simulated the processes including the formation of the liquid film, the entrainment of the mainstream, the liquid film cooling of the thrust chamber, and the impact of liquid film cooling on engine performance.

In this way, Xu You can easily check the impact on the results of each process when each parameter is changed.

Based on the feedback from various data, Xu You thought about how to design a new thrust chamber cooling structure.

Unknowingly, Xu You once again entered that magical flow state.

In the flow state, Xu You's attention is more concentrated, and his brain state reaches the highest level.

Gradually, Xu You finally pieced together the scattered chains in his mind.
Chapter completed!