On the second day after returning to the capital, after breakfast, Qin Ruoshu drove her second aunt and Feng Bei out to play in the "dowry" that had been eaten for a long time.
Zhou Yan rushed to the Xinghan Group Aviation Design Department to preside over the new engine design finalization simulation review meeting.
Although most of the employees in the design department are new employees who have been employed for less than three years, the technical backbone is all recruited by Xu Chongsheng from major AVIC design institutes. Although they may have signed confidentiality and non-compete agreements of one kind or another, experience is what counts after all.
Well, I have also gone through design reviews, so naturally I am not as unsure as the newly recruited employees.
The location of the review was set in the large conference room of the design department. As soon as he entered the door, Zhou Yan found that all the employees were holding notebooks and sitting under the stage, staring at him carefully.
"Don't be too nervous," Zhou Yan put down his laptop with a smile, "This review is just an internal design review, mainly to examine the skills of each professional supervisor. Of course, everyone can take this opportunity to learn about aero engines.
design review process…”
With that said, Zhou Yan glanced at Xu Chongsheng and the recorder of the design department beside him: "Let's get started!"
“First, it’s the interpretation of the engine design mission statement.
The first core element of the engine design brief must be power.
The power determines the engine's fuel economy, air intake volume, and the temperature of the core combustion chamber, which is the total temperature in front of the high-temperature impeller.
To expand the discussion, there is also a core element involved, thermal efficiency.
When designing, it should be noted that to calculate fuel consumption and air intake, a thermal efficiency needs to be estimated.
This needs to be noted. Our estimated data are all estimated by the design software during the pre-prototype. When it is formally reviewed, our answer should be the empirical value."
The calculation of the thermal efficiency of an aircraft engine is very simple. The power is divided by the calorific value of fuel consumption. It is usually calculated by the exhaust temperature.
"Generally speaking, the size of the engine is limited, the number of blades arranged is relatively fixed, and the exhaust temperature is limited. Therefore, the higher the total temperature in front of the wheel, the higher the efficiency..."
Zhou Yan glanced at the computer screen, then raised his head, and found that many employees in the audience were taking notes, and smiled: "Listen first, I will sort out some written things later.
Putting fuel consumption aside, let's talk about the air intake volume first.
Whether it is a turboprop, a turbofan, or a turbojet, the air intake volume can be infinitely enlarged, but unfortunately, there are engine size restrictions.
The diameter of the engine determines the upper limit of air intake, while the length determines the total number of stages of the compressor and impeller.
Although the intake fan does not need to be treated with high temperature resistance, its performance determines the air intake efficiency of the entire engine.
Note that the blade shape of our air intake fan is ready-made. If the reviewers asked about the source, they found it accidentally, and everyone answered that it was designed according to the air intake demand..."
Xu Chongsheng on the side looked at Zhou Yan comparing items one by one with the technicians below, and was a little surprised: This guy didn't seem to have never been reviewed, but he looked a bit like an old man who had gone through many design review reviews.
.
After working all morning, the progress was only about halfway done. Zhou Yan was too lazy to go home. After calling Qin Ruoshu, he simply had lunch in the company restaurant.
After taking the meal, we found a place and just sat down. Before our butt was warm, Xu Chongsheng came over with a dinner plate.
"Mr. Zhou," Xu Chongsheng said with a smile on his face, "Looking at the situation this morning, these 5,000-kilowatt turboprop engines are basically finalized. There are no big problems in trial production and production. Do you think we can install a few more?"
new project……"
Zhou Yan stared at Xu Chongsheng with a smile and said: "You are the boss, you have the final say!"
"Mr. Zhou, without your technical support, I can't do it..." Xu Chongsheng asked tentatively, "Should we first turn this 5,000-kilowatt turboprop into a core..."
"You want to build a high-power worm shaft?" Zhou Yan was amused, "The technical difficulty of that thing is much greater than that of a worm propeller..."
"Someone has to do these things, right?" Xu Chongsheng was very thoughtful, "Don't forget, several of our design teams came here for the Mi-26."
"In that case, after the design review is completed, the design team will be divided." Zhou Yan sighed, "The aviation engine is divided into three directions, turboprop, worm shaft, and turbofan. Just doing the worm shaft is a bit too wasteful.
A turbofan core machine.”
"Really?" Xu Chongsheng immediately became more energetic, "How big is it?"
"D-18T core machine, redesigned with new technology, codenamed QH-12."
"Really?" Xu Chongsheng was knocked unconscious by the pie falling from the sky. "Such a big guy is enough to support a domestic super-heavy strategic transport aircraft..."
"We must seize the time to build all supporting aviation engine parts factories," Zhou Yan thought for a while, "When the worm shaft and turbofan core machine are completed, we will also build the complete machine..."
"Well, once this review is over, we'll start right away..."
After the lunch break, the review continued.
However, when it comes to the specific design, there are more "core technologies" involved, such as turbine blade materials, blade design sources, combustion chamber powder cartridges, improved film cooling technology...
In the afternoon, I was busy until about seven o'clock, and finally completed the internal audit. There were no major problems, but there were quite a few minor ones, but they were all insignificant details.
"I just told the cafeteria to provide extra meals. Let's make do with it first. After the department approves it, we can treat everyone to a big meal." Zhou Yan closed his notebook and looked at Xu Chongsheng. "Mr. Xu, everyone is working overtime today."
After eating in the cafeteria, I returned home and when I opened the door, I found my wife and Feng Bei sitting in the living room watching TV.
Seeing Zhou Yan come in, Feng Bei smiled and slumped down on the back of the sofa: "Brother, your living room is so exciting. When I get married one day, you will have to give me an identical TV!"
"When you get married, the LCD TV will be worthless," Zhou Yan joked with a smile, "Let's change the gift to a big gold bracelet that weighs a pound..."
"It's too tacky..." Feng Bei raised his hand and flashed the jade bracelet on his wrist, "There are eight sets of ten bracelets of this style..."
"Isn't that easy to say?" Zhou Yan was amused, "Cut the bottom of a beer bottle and get as much as you want..."
"Sister-in-law, look at my brother..." Feng Bei hugged Qin Ruoshu and acted coquettishly.
At home, Qin Ruoshu is the youngest and has never experienced the joy of "beating your younger brother and bullying your younger sister as soon as possible". Now that she suddenly has a younger sister, she is naturally very happy.
"Lao Zhou, Beibei is a guest, can't you just give in?"
"Yes, yes!" Zhou Yan sat down with a smile and poured himself a glass of water, "Where did you go to play today?"
"Where else can we go? Central Square, Wangfujing, by the way..." Qin Ruoshu suddenly turned around, "The courtyard over at Beichizi has been renovated. Do we have to buy furniture in two days?"
Before Zhou Yan had time to answer, Feng Bei answered first: "We'll just live together and make do, so you don't have to deal with the furniture..."
"There's no way to accommodate pregnant women..." Zhou Yan shook his head helplessly, "At least it has to be made of solid wood and painted with environmentally friendly paint. I'll go with you on the weekend..."