213: Hungry

Therefore, the library was packed, with many people even finding spots on the floor to sit and study.

After borrowing a few books, Xu Ning quickly ate a simple lunch and returned to the computer room with the materials to continue working.

Even without the help of any special tools, relying on his extensive past research experience, he was still able to complete the task efficiently.

However, as he delved deeper into the work, he felt somewhat dissatisfied with the results.

Back then, when he worked for Changhong Group, he was very young, only in his early twenties, and was a novice Engineer fresh out of school.

After twenty years of refinement and completing a comprehensive research and development plan with the system's assistance, his way of thinking had long surpassed his past self.

"Although it's finished, and the performance has met expectations, still..." Xu Ning looked at the research and development document on the screen.

Since he was working for a small company, there was no need to follow strict formatting requirements, so he prepared an electronic version of the research and development report directly, intending to send it to Zhao Zhide once completed.

Considering this was just the research and development of a standard air conditioning fan blade, its rotational speed and airflow rate were not too high, so many approximations and simplifications were used in the document.

"This isn't transparent or clear enough..." Xu Ning murmured to the computer.

Although such simplifications were acceptable in the home appliance industry, he now had a more advanced idea.

Xu Ning always felt he could do better.

An axial fan is essentially a very simple compressor.

As a type of turbomachine, the airflow inside it tends to diffuse, which makes the flow prone to separation, thus affecting its performance.

Although severe stall or surge is unlikely during stable operation of an axial fan, as the tip boundary layer thickens, the fan efficiency decreases, and noise is also generated.

In the past, most manufacturers only cared if the fan could provide sufficient airflow, and the requirements for efficiency and noise control were not strict.

But now, if he was to compete with Fuji Electric, he had to improve the fan's overall performance.

"Perhaps I can find inspiration from the research and development of turbine compressors for aero-engines?"

Thinking of this, Xu Ning quickly saved the current research and development version and saved a copy separately.

For a researcher and developer, "frequent saving, multiple backups" is a principle that must be kept in mind; this is valuable experience summarized by predecessors through painful lessons.

He named the new folder "Blade R&D Second Version."

Although Xu Ning had achieved some success before his rebirth, he was still quite green in the field of aero-engine research and development.

This small project just gave him an opportunity to practice.

"Achieving active flow separation control on this small fan is not very realistic; it's better to try adjusting the blade shape."

"Transforming the original straight blades into a curved style..."

Select three key points at different positions on the blade and construct a new curve using the Lagrange interpolation method;

Set constraints for the outermost point to prevent the blade from contacting the inner wall of the casing;

Utilize the isight software to integrate icem-cfd and fluent tools, optimize the blade, ensure that the curved blade covers the same area as the original straight blade, and that the airfoil parameters of each cross-section remain unchanged.

The next step was a process of continuous experimentation and finding the best solution.

Once the direction for improvement was clear, the rest was about executing with full effort.

Xu Ning started the Catia software again and began to improve the first version of the blade.

As the research and development gradually approached perfection, his speed slowed down.

After all, simulation can only provide a general direction and cannot replace actual experiments.

The lessons of the boeing 737 MAX are still vivid; relying solely on simulation, lacking sufficient theoretical support, could ultimately lead to a major disaster.

When developing the J-7 modification previously, although the system suggested verification through wind tunnel tests, it could not be implemented due to real-world constraints.

At that time, Xu Ning used a bi-ellipsoid model to test the reliability of the calculation results, as it was just a research assignment, not an actual product.

However, this time was different.

There was no system support, nor were there any ready-made performance benchmarks to refer to.

What was more troublesome was that this research and development was for direct competition with Fuji Electric.

Specifically, after making the curved adjustment to the initial version of the blade, the required simulation technology also changed, making performance prediction more complex.

In this situation, the client felt uneasy, and even the researcher and developer himself found it difficult to determine how much progress had been made.

"It seems I must find a place to conduct experiments," he thought, saving the second version of the research and development.

By this time, night had long fallen, and the time displayed indicated it was nearing the computer room's closing time.

"Tomorrow, I need to ask Academician Du for help to see if an experimental site can be arranged."

Xu Ning stretched his body and began to tidy up the desk.

Fortunately, the lunch was quite satisfying; otherwise, he would definitely be starving right now.

In this era, going out late at night was not safe; to ensure the safety of the group members, the academy implemented closed management at night.

Although Xu Ning had 800 yuan in his pocket, in that remote place, he couldn't even find a restaurant and had to go to bed hungry.

The next morning, Xu Ning quickly washed his face and headed straight to Professor Du Yishang's office with his computer bag.

"Oh, Little Xu, you're here so early?"

Professor Du was a bit surprised to see Xu Ning, still holding the phone he was about to dial.

"Hello, Professor Du!"

Xu Ning greeted him familiarly and pulled up a chair to sit beside Professor Du.

"How did you know I had already finished reading your paper?"

Professor Du said, sorting through the materials on his desk, and pulled out Xu Ning's paper.

"Actually..."

Xu Ning scratched his head.

"Your paper is quite well written, with almost no areas needing revision,"

Professor Du continued, "However, it seems inappropriate to add my name."

"Professor Du, you're too modest."

"Do you think I would care about being the fifth author?"

Professor Du interrupted him.

"Then how about you being the corresponding author?"

Xu Ning suggested.

Professor Du reached for the triangular ruler on the desk, seemingly deep in thought.

"Haha, I'm just kidding, don't take it seriously!"

Xu Ning quickly waved his hands.

"In that case, put your name as both the first author and the corresponding author.

This way, if any peers are interested in this paper, they can contact you directly."

Professor Du said, organizing the manuscript in his hands, "If you want to publish quickly, you can consider 'Acta Aeronautica Sinica,' which is jointly published by our academy and the China Society of Aeronautics and Astronautics."

"However, publishing only in the academy journal might not carry enough weight.

If you are willing to put in a bit more effort to refine it, this paper can even be submitted directly to 'Progress in Aerospace Science,' which is a top journal in the industry,"

Professor Du added.

Clearly, he had a very high opinion of Xu Ning's work.

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