The military-industrial scientific research system of the academic master

Chapter 1286 Computational Materials Science, is it amazing?

A research and development competition in the field of hypersonic weapons has begun silently on both sides of the Pacific.

But this time, it was the United States that was forced to choose "overtaking in corners" due to insufficient objective conditions.

One month later.

Huairou Science City.

Since the space fishing boat project ended and Chang Haonan shifted his focus to the hypersonic project again, the wind tunnel group here has begun working day and night.

Every ignition of the detonation drive section, every roar of the shock tube, and every loading and adjustment of the aerodynamic model will send a large amount of experimental data to the entire R&D team, pushing China's hypersonic aircraft closer to the real sky.

Chang Haonan, who has a number of ultra-high-speed wind tunnels to assist him, does not need to worry about the degree of simulation of the test, but this does not mean that the subsequent design and development tasks will be an easy task.

Compared with competitors who have already verified hypersonic-related technologies on multiple projects such as X15 and X43A, many of his technologies are literally starting from scratch.

JF8 and JF10 are subject to overall temperature limitations and can only undertake some relatively corner-to-corner testing tasks.

With just one JF14, even if the compressor is overclocked to the point of smoking, it really can't keep up with Chang Haonan's pace.

Of course, everything is afraid of comparison.

Compared to the past, when even an ordinary supersonic wind tunnel had to be calculated in terms of time and cost, now the entire Institute of Mechanics and most of the aviation industry system revolve around him, which is definitely a very high-standard treatment. .

So Chang Haonan also knew that this matter could not be rushed.

On the contrary, other people in the project team were somewhat restless.

Taking advantage of the wind tunnel to pressurize between the two tests, Xing Muchun held a newspaper in his hand and came to Chang Haonan, who was typing on the keyboard in front of the conference table:

"Academician Chang, I see that there are a lot of news reports recently, saying that the air-breathing hypersonic missile in the United States has begun ground testing and is scheduled to make its first flight before 2008..."

After hearing the news, Chang Haonan moved his hands.

After the attempt to use an F22 formation to exert military deterrence against China went bankrupt last year, news leaked from across the ocean that the development plan for hypersonic weapons was advanced. However, since no other relevant reports were seen subsequently, the outside world generally believed that it was The Department of Defense or Boeing is operating behind the scenes, hoping to obtain more research and development funds.

The fiscal year 2006 budget bill later passed also confirmed this conjecture. The funding allocated by Congress for the "air-breathing hypersonic demonstration vehicle" increased by more than five times compared with 2005.

Coupled with the series of turmoil caused by China's test-launch of new missiles in early 2006, this matter quickly faded from public attention.

But now it seems that the other party may be serious.

He turned his attention to the English newspaper next to the computer.

It must be said that Americans have indeed been at the forefront of the world in terms of information openness.

Of course, this is also closely related to the self-confidence they have built in the past.

The newspaper not only contained the title just mentioned by the other party, but also included a rather well-made schematic diagram of the appearance of the X51A.

Perhaps to others, this is just a computer-generated image of imagination.

But Chang Haonan knows very well that the degree of restoration of this picture is very high.

Even the tail transition, which was only added in the second phase of the improvement plan, is clearly drawn.

This shows that the X51A project has most likely advanced to a fairly advanced stage.

Seeing Chang Haonan staring at the newspaper in silence, Xing Muchun felt that if he didn't say anything else, the atmosphere would be too embarrassing, so he had to continue:

"Our JF14 wind tunnel should be the first simulation equipment in the world that can restore the hypersonic flight environment in the atmosphere. In the United States, whether it is the Air Force, NASA or Boeing... we are specialized in several major laboratories After checking the information, there is absolutely no ability in this area, including the LENS2 wind tunnel, which won the AIAA ground test award a few years ago, and it just stays at the performance indicators of JF8..."

In fact, there was no conclusion about why the US hypersonic research got up so early but rushed to the late work in the last life until Chang Haonan was reborn.

So he had no choice but to come up with a statement that had a relatively high degree of recognition:

"In terms of ultra-high-speed wind tunnels, the Americans have tried two technical routes: free piston drive and heated light gas drive. In hindsight, they chose the wrong ones. So now they can only reduce the wind tunnel test time and go directly. Calculation simulation plus flight test approach..."

Jiang Zonglin, who had been standing by without talking to him just now, also started talking:

"In addition, we are not the only ones working on detonation-driven wind tunnels. For example, there is a TH-D high-enthalpy shock wave wind tunnel at RWTH Aachen University in Germany. It was just built two years ago. Its overall performance is about the same as that of JF10. "The total airflow temperature may be slightly higher. Based on their relationship with the Americans, Boeing is also likely to obtain some testing opportunities through leasing."

Xing Muchun's face was full of disbelief.

He has a background in rocket research. It is hard to imagine that the United States, which has always been regarded as its main opponent and pursuit target, can do such a thing:

"How is it possible to guarantee the success rate of the test? Even..."

In fact, what Xing Muchun wants to say is that the most authoritative person in numerical calculation and simulation nowadays is Chang Haonan himself, but even the latter does not dare to skip the step of wind tunnel testing and fly directly. How dare the Americans on the other side dare? ?

But it was really difficult to say this in a way that didn't sound like flattery, so I got stuck halfway.

Chang Haonan waved his hand:

"It's better to run fast than to run steadily. Don't worry about what the Americans think. We have actually gained an advantage at the basic research level now. We just need to keep going step by step and wait for the other side to make mistakes..."

Although his tone was flat when he said this, he still felt secretly happy -

Ten years, ten years! I have finally waited for this day!

Chase it, Takako!

Just when Xing Muchun was about to say something again, Chang Haonan's cell phone suddenly rang.

"Wait a minute, I'll take a call..."

He quickly signaled the other two to be silent and pressed the answer button.

It was Li Yabo who called.

The latter research does not require the use of the wind tunnel itself. It only requires the shock tube device to restore the ignition process during the actual flight. Therefore, for the past month, it has been with Chang Hao, who is responsible for aerodynamic structure design and power development. South is working in parallel.

"Teacher, the results of my analysis are out."

Faced with this unexpected good news, Chang Haonan stood up and said:

"Wait a minute, I'll be there right away. Let's talk in person..."

…

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When the three of them arrived at the computing center of Huairou Science City, Li Yabo had almost sorted out the calculation results.

"Teacher, I really don't know the reaction kinetics of metal particles until I do it. I'll be shocked once I do it..."

Seeing Chang Haonan come in, he immediately stood up and handed the technical report on the table that was as thick as a book that had not yet been bound, and then continued:

"The current academic calculation methods for the combustion of aluminum particles... or most solid metal particles are basically based on the droplet combustion model, and then gradually add the influence of condensed phase products and deposition products... But I use the ideas you provided, from I started to re-verify the most basic part and found that the actual process should be much more complicated..."

After hearing what he said, the other two people who were not expert in this area and just came to join in the fun quickly gathered around.

Obviously, this is going to be a big news story.

Just at this time, Chang Haonan also turned to a more important page in the report:

"Two-dimensional... unsteady-state dynamic-diffusion-evaporation controlled combustion model?"

Chang Haonan couldn't even pronounce this name smoothly the first time.

"It's really complicated..."

Li Yabo quickly began to explain:

“In fact, in the ignition stage that most people are most concerned about, because there is not enough condensation and sediment accumulation, it is feasible to use an improved droplet model to describe it. This should be something that most researchers have not thought about for many years. Can identify the main cause of the problem.”

"But after the particles have been ignited and the oxidant reacts with the metal vapor to form low-order oxides, the oxides are deposited on the surface of the particles due to diffusion and convection, forming an oxide cap. This oxide cap prevents the evaporation of the metal inside the particles. This affects the distribution of components and temperature. At the same time, the exothermic effect generated by condensation provides a certain amount of heat to the particles, so the actual process is controlled by dynamics, diffusion and evaporation..."

Obviously, the name just came from nothing.

While listening to the other party's introduction, Chang Haonan quickly flipped through the report in his hand:

"Surface reaction, gas phase reaction, decomposition reaction, condensation reaction...a total of 17 reaction kinetic mechanisms?"

Although this research idea was indeed given by him, it was completely beyond Chang Haonan's expectations to achieve such subversive results by unintentional intervention.

It was an unexpected surprise.

But on the other hand, even with today's supercomputer level, if you want to completely restore such a process from the microscopic particle level, it is still somewhat incapable...

"Uh... I built an additional sub-model for the condensation and deposition processes of the oxidation products, and also considered the impact of the redox cap on the component distribution and temperature field... I just assumed that the particles are all perfectly spherical, so I put the three-dimensional The structure has been simplified into two dimensions, otherwise it would have been much more complicated.”

Li Yabo scratched his head:

"In general, in the ternary system of AP/HTPB/AI, the addition of metallic aluminum will cause the combustion surface to agglomerate and form large-size liquid phase agglomerates..."

“In basic tests, this process has little impact, but in actual operation, it will increase the two-phase flow loss of the engine and make the **** deposition and insulation layer ablation more serious, thus reducing the working stability of the solid engine. It even has propellant specific impulse..."

“…”

The communication between the teacher and the student gradually entered an area that Xing Muchun and Jiang Zonglin did not understand well.

Especially for the latter, he has worked in the Institute of Mechanics for half his life and never thought that he could be related to research in the field of basic chemistry.

Taking advantage of a moment when neither Chang Haonan nor Li Yabo spoke, Jiang Zonglin came closer again and looked at the dazzling pile of chemical symbols on the paper.

"This...is what our wind tunnel center can produce?"

Chang Haonan closed the report and put it aside, then nodded:

"Computational materials science is amazing, isn't it?"

(End of chapter)