Chapter 1286 Computational Materials Science, isn’t it amazing?

Chapter 1286 Computational Materials Science, isn’t it amazing?

A research and development competition in the field of hypersonic weapons has quietly unfolded on both sides of the Pacific Ocean.

But this time, it was the United States that was forced to choose to "overtake on a curve" due to insufficient objective conditions.

A month later.

Huairou Science City.

Since the end of the space fishing boat project, Chang Haonan shifted his focus back to the hypersonic project, and the wind tunnel group here began to work in a cycle 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 provide a large amount of experimental data to the entire R&D team, pushing China's hypersonic aircraft closer to the real sky.

With a number of ultra-high-speed wind tunnels to assist him, Chang Haonan does not need to worry about the degree of realism 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 verified hypersonic-related technologies in multiple projects such as X15 and X43A, many of his technologies are literally starting from scratch.

JF8 and JF10 are subject to the overall temperature limit and can only undertake some relatively marginal testing tasks.

With only one JF14, even if the compressor was overclocked to the point of smoking, it still couldn't keep up with Chang Haonan's pace.

Of course, everything is afraid of comparison.

Compared to the past when even building an ordinary supersonic wind tunnel required calculation 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-level treatment.

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

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

While the wind tunnel was pressurizing between tests, Xing Muchun came to Chang Haonan, who was typing on the keyboard at the conference table, holding a newspaper in his hand:

"Academician Chang, I've seen a lot of news reports recently saying that the United States has begun ground testing of its air-breathing hypersonic missile, and plans to make its maiden flight before 2008..."

Upon hearing the news, Chang Haonan paused.

After the failure of last year's attempt to impose military deterrence on China through an F22 formation, news leaked on the other side of the ocean that the development plan of hypersonic weapons would be advanced. However, because no other related reports were seen afterwards, the outside world generally believed that the Ministry of Defense or Boeing was operating behind the scenes, hoping to obtain more research and development funds.

The 2006 fiscal year budget bill that was later passed also confirmed this speculation. The funds allocated by Congress to the "air-breathing hypersonic verification vehicle" directly increased by more than five times compared to 2005.

Coupled with the series of disturbances caused by China's test-firing of a new missile in early 2006, this matter quickly faded from public attention.

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

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

It must be said that when it comes to open information, Americans have indeed always been at the forefront of the world.

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

The newspaper not only had the title the other party had just mentioned, but also came with a well-made schematic diagram of the X51A's appearance.

Perhaps to others, this is just a computer-generated imaginary result.

But Chang Haonan knew very well that the degree of restoration of this picture was very high.

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

This indicates that the X51A project has most likely advanced to a very late 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 awkward, so he had to continue:

"Our JF14 wind tunnel should be the world's first simulation device that can reproduce the hypersonic flight environment in the atmosphere. We have checked the data of several major laboratories in the United States, whether it is the Air Force, NASA or Boeing... They definitely do not have this capability. The LENS2 wind tunnel that won the AIAA ground test award a few years ago is only at the performance level of the JF8..."

In fact, as to why the United States started its hypersonic research so early but ended so late, there was no conclusion in the previous life until Chang Haonan was reborn.

So he had to come up with a relatively high degree of recognition:

"In the area of ​​ultra-high-speed wind tunnels, the Americans have tried two technical routes: free piston drive and heated light gas drive. In hindsight, they made the wrong choices. So now they can only reduce the wind tunnel test time and go directly to the route of computational simulation plus flight tests..."

Jiang Zonglin, who had been standing by without saying anything, also started talking:

"In addition, we are not the only one working on detonation-driven wind tunnels. For example, there is a TH-D high-enthalpy shock wave wind tunnel at the Aachen University of Technology in Germany. It was just built two years ago. Its overall performance is roughly the same as that of the JF10, and the total airflow temperature may be slightly higher. Given their connections with the Americans, Boeing is likely to get some testing opportunities by renting it."

Xing Muchun's face was full of disbelief.

He is a rocket researcher, and it is hard to imagine that the United States, which has always been regarded as the main opponent and target of pursuit, can do such a thing:

"How can we guarantee the success rate of the test? Even..."

Actually, what Xing Muchun wanted to say was that the most authoritative person in numerical calculation and simulation today is Chang Haonan himself, but even the latter did not dare to skip the wind tunnel test and fly directly. How dare the Americans on the other side?

But it was really hard 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 steadily than fast. Don't worry about what the Americans think. We have actually gained an advantage in basic research. We just need to follow the steps and wait for the other side to make mistakes..."

Although his tone was calm when he said this, he couldn't help but feel secretly happy in his heart -

It’s been ten years. Ten years!

I have finally waited for this day!

Chase him, Eagle!

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

"Wait, I have a call..."

He quickly signaled to the other two to keep quiet, then pressed the answer button.

It was Li Yabo who called.

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

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

Faced with this somewhat unexpected good news, Chang Haonan stood up immediately:

"Wait a minute, I'll be there soon, let's talk about it in person..."

……

Read the error-free version at 69shuba! 6=9+shu_ba is the first to publish this novel.

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

"Teacher, the reaction dynamics of metal particles is really amazing until you try it out..."

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

"At present, the theoretical calculation methods for the combustion of aluminum particles... or most solid metal particles in academia are basically based on the droplet combustion model, and then gradually add the effects of condensed phase products and deposition products... But I used the ideas you provided and re-verified it from 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 experts in this area and just came to join in the fun quickly gathered around.

Obviously, this is going to be big news.

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

"Two-dimensional... non-steady-state kinetic-diffusion-evaporation controlled combustion model?"

This name was so long that Chang Haonan couldn't pronounce it smoothly at first.

"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 sedimentation accumulated, it is feasible to describe it with the improved droplet model. This is probably the main reason why most researchers have not been able to find the problem for many years."

"However, 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 oxidation cap. This oxidation cap prevents the evaporation of the metal inside the particles, thereby affecting the distribution of composition and temperature. At the same time, the exothermic effect of condensation provides a certain amount of heat to the particles. Therefore, the actual process is controlled by power, diffusion and evaporation..."

Obviously, the name just now was not groundless.

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 he was indeed the one who came up with the research idea, it was still beyond Chang Haonan's expectations that he could unexpectedly achieve such a subversive result.

It was a pleasant surprise.

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 beyond your ability...

"Well... I built a sub-model for the condensation and deposition processes of the oxidation products, and also considered the effect of the oxidation cap on the component distribution and temperature field... I just assumed that the particles are perfectly spherical, so I simplified the three-dimensional structure into two dimensions. Otherwise, it would probably be even more complicated."

Li Yabo scratched his head:

"In general, in the AP/HTPB/AI ternary system, the addition of aluminum metal 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 work it will increase the two-phase flow loss of the engine and make the slag deposition and insulation layer ablation more serious, thereby reducing the working stability of the solid engine and even the propellant specific impulse..."

"..."

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

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

Taking advantage of the moment when Chang Haonan and Li Yabo were silent, Jiang Zonglin moved closer and looked at the dazzling pile of chemical symbols on the paper.

"Is this... something that our wind tunnel center can produce?"

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

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