Chapter 95 Yao Mengna’s discovery
Yao Mengna borrowed the "Aerodynamics Journal" purely out of interest.
She saw an article there with an interesting summary.
It was written by a Ph.D. from Bingcheng University of Technology.
By opening a jet slit between the suction surface and the pressure surface of the blade, the high-speed airflow on the pressure surface can be directed to the suction surface through the jet slit under the action of the pressure difference, injecting energy into the low-speed area of the suction surface, thereby delaying the separation of the boundary layer.
When she first saw this place, Yao Mengna was a little shocked.
This method has a simple structure, is easy to operate, and does not require additional energy injection.
If the effect mentioned in the abstract can really be achieved, it can be said to be a revolution in compressor internal flow control technology.
It seems that an article of such weight should not appear in a mere Aerodynamics newspaper.
After all, even if this journal is placed in China, it cannot be regarded as the top in the aerospace field.
Moreover, considering that this is just a basic research article that does not involve specific models, there is no problem in submitting it to relatively well-known foreign journals such as ACTA Astronautica or Advances in Space Research.
You must know that according to the current achievement evaluation system, even the top Chinese Journal of Aeronautics and Astronautics is not at the same level as the latter two.
Thinking of this, Yao Mengna turned over the pages carefully, preparing to see the specific contents inside.
At the same time, a name that appeared very frequently around her recently came to mind almost involuntarily.
"There can't be anyone like him who doesn't even care about papers..."
Chang Haonan gave up on Progress in Aerospace Sciences, the top journal in the industry. Yao Mengna had heard about it from Du Yishan before.
At that time, all she could think about was emotion and admiration for the other person's awareness.
However, as her understanding of Chang Haonan deepened, she gradually realized that in addition to the issue of consciousness, a big reason for that matter was that a paper in the top journal in the industry might indeed be nothing to the former.
Thinking of this, Yao Mengna finally realized that her thoughts seemed to be wandering a little too far, so she shook her head and forced herself to return her attention to the magazine in front of her.
After spending about half an hour carefully reading the following content, she understood why this seemingly high-level article was posted so casually——
The verification part is really inadequate.
Not only are the data in the experimental part fragmented, but the range of experimental conditions chosen is also very narrow. There is not even a systematic study on the impact of the properties of the jet slit on compressor performance, let alone more complex flow field simulation and theoretical analysis.
"What a pity……"
Yao Mengna shook her head. It was not difficult for her to think that the reason for this situation was limited by the objective experimental conditions.
After all, at this time, there is not enough research funding anywhere, and the research groups of major universities are mainly focused on making money to make ends meet.
If it had been in the past, she would probably have just written down the main conclusions of the article in a notebook, and would tell her mentor when she saw him.
Even for Du Yishan's research team, experimental funds are still tight. Without project support, there is no condition to conduct this level of experimental verification.
"but……"
After hesitating for a moment, Yao Mengna stopped putting the magazine back on the shelf and borrowed it.
She plans to use numerical simulation to verify the content of this article.
After returning to the computing center, she immediately found Lin Shikuan, who was busy following Chang Haonan's guidance on parameter fitting and flow spectrum calculations for blades with different sweep designs.
Although the entire digital design team is from the 601 Institute, considering that the 606 Institute has almost no experience in numerical simulation, and the Project is a whole, Yang Fenghao still assigned them all to Chang Hao. Nan is responsible for managing the engine research team.
"Forest worker, I need you to borrow a workstation and...well, one or two people."
"Do you have any new tasks coming from Dr. Chang?"
Lin Shikuan was stunned when he heard Yao Mengna's request. He thought it was some new job at Institute 606, and rubbed his forehead that was swollen from long hours of work with some distress.
Although the basic principles of numerical simulation are the same, their entire team, including Chang Haonan and Yao Mengna, has less than ten people in total, but they have to bear the entire improved calculation and simulation part, which is really stressful.
"Well... this time it has nothing to do with him. It's just my own idea." Yao Mengna shook her head: "It's about the design of the compressor blades."
After he finished speaking, he seemed worried about saying too much, so he added: "But it hasn't been verified yet, so it's hard to say what the result will be."
Lin Shikuan showed a slightly troubled expression.
Among the duo sent by Beijing Hang University, although Yao Mengna's brilliance is not as dazzling as that of Chang Haonan, so much so that the entire August 3rd Project has a faint tendency to work around him, but if it specifically refers to the digital design team, Yao Mengna is influenced by On the contrary, I need more help.
Mainly because the latter is really good at parametric design.
So he wanted to do this favor to the other party.
But right now, his manpower is indeed very insufficient, and Chang Haonan's progress is very tight.
"It doesn't matter if we open another workstation, but we really can't spare the manpower. As you know, parametric fitting mainly depends on the workload." Lin Shikuan replied with some confusion:
"But I suggest you ask Dr. Chang for help. You should be more familiar with him than I am. In terms of numerical simulation, his efficiency alone can at least equal that of a company."
"That's...ok."
Yao Mengna was actually not sure whether she could really dig out anything useful from that article, so she didn't force it and just asked for the key to another computer room where the workstations were kept.
After opening the workstation, she entered a series of command line statements with unskilled movements, then flipped the journal in her hand to the page she wanted to read, and took out the scratch paper and a red and blue gun from the bag she carried with her. pencil.
I don’t know when Yao Mengna started putting a pencil sharpener and a large number of red and blue pencils in her schoolbag, but the ballpoint pen she was used to using had not been taken out for a long time.
But she seemed unaware of the change.
"The missing parts of this article are first the cross-sectional shape of the jet slit, and then the location of the slit..."
"The flow problem inside the compressor naturally still requires solving the Reynolds average NS equation, but for impeller machinery, it should be switched to the rotating coordinate system..."
After all, she was someone who had experienced a lot of training around Chang Haonan. Yao Mengna quickly wrote out the basic simulation ideas, and started meshing, model selection, and boundary conditions determination on the computer according to her own ideas.
Then, her work progress got stuck here.
