"Robinson r44?" Vice President Miao couldn't help but nodded when he heard this. He really knew this brand new product of Robinson Company: "Indeed, compared to r22, r44 has a wider range of applications... But Xiao Zhang

Comrade, you are developing two engines at the same time, are you busy?"

Although Vice President Miao said this last sentence in a joking tone, it also indirectly expressed his attitude or concern: Are you biting off more than you can chew?

"Thank you for your concern, leader." Zhang Qihang first expressed his gratitude to Vice President Miao, and then said: "As for the problem of biting off more than you can chew, leader, the truth is that when we develop engines, we adopt the same approach as traditional engines.

The development process is different, and we adopt the most advanced modular development concept in the world today."

"Modular concept?" Vice President Miao couldn't help but raise his eyebrows when he heard this, looking very interested: "Can you explain it to me in detail?"

As the main leader of the Air Force Academy, he has of course heard of the modular concept, but more in the field of equipment. For example, when designing a fighter jet, integrating a certain function into an independent but cross-linked system

module, and adopts a quick-release design. The advantage of this is to improve the ease of maintenance. Once this module fails, the module can be quickly removed and replaced with a new one, and the fighter can be restored in a very short time.

Restore combat effectiveness.

After this concept based on rapid battlefield repair was proposed, it immediately attracted the attention of military equipment research and development units in various countries, and they began to research modular technology. Naturally, our country's military equipment research and development and manufacturing units are no exception, and they have also begun research on modular technology.

We are developing our modular technology, but what about the modularization of engines?

Vice President Miao, who was extremely interested in this matter, felt more and more that his trip to Langya was the right one.

"Of course," Zhang Qihang nodded: "The modular technology of the engine, simply put, means that when developing an engine, we must first determine the bore and piston stroke of the engine, that is, determine the displacement of each cylinder.

, after determining the displacement of a single cylinder, the power of each cylinder is roughly determined.

Next, you can get the base power you want through different numbers of cylinder combinations like building blocks. After that, you can get the base power you want by adjusting the intake, exhaust and turbo boost values.

The power...that is to say, the performance of the engine is destined from the beginning."

"This is a good idea," Vice President Miao also knows technology. After listening to Zhang Qihang's brief introduction, he immediately understood the benefits of this modular development concept: "In this way, it is equivalent to saying that if you master the v4 engine

Among the technologies, it is natural to master the technologies of v6 and v8."

"You can't say that, it can only be said that we have a certain foundation," Zhang Qihang explained shyly: "Compared with v4, engines with v6 and v8 structures are more complex, and it still takes some effort."

"..."

Vice President Miao was speechless: Do you call this humility? Is it humility?

Unwilling to dwell on this issue with him, he asked instead: "By the way, Comrade Xiao Zhang, I see that your engine uses a V-shaped structure. Why don't you use piston aerospace engines such as Rotax, Continental and Lycoming?

The horizontally opposed structure commonly used in engines?"

This is what Vice President Miao is curious about.

After hearing the question asked by Vice President Miao, others couldn't help but become curious and asked Vice President Miao about the structural issues related to the piston aero engine. Under Vice President Miao's explanation, everyone

Understand, in the field of piston aero engines, a generally recognized understanding is:

In the field of high-power piston aero engines, the structure of the engine is basically a star structure. For example, the famous B-29 "Super Fortress" bomber uses a classic star structure. The Wright-R3350 engine is the first engine of our country.

Teach-6 trainer aircraft, Y-5 transport aircraft and Z-5 helicopters also use radial air-cooled engines;

In the field of low-power aviation engines, except for products such as powered parachutes and powered delta wings that are classified as aviation sports equipment internationally, they are basically horizontally opposed structures.

In this case, the two V-shaped structure aeroengines of Huateng Industrial Group seem a bit strange - no one thought it was strange before, after all, everyone saw a lot of V-shaped structure engines in cars, but now

After listening to Vice President Miao's explanation, everyone began to wonder why Huateng Industrial Group did not learn from Rotax, Continental and Lycoming, the "predecessors" of low-power piston aero engines, but instead found a new way to use a V-shaped structure?

"There are two main reasons why we chose the V-shaped structure," Zhang Qihang said eloquently under the gaze of everyone: "The first reason is to avoid eccentric wear of the piston and the lower part of the cylinder. We have a rotax914 here.

, blow look at this

You can know from just one engine that the lower part of the engine with a horizontally opposed structure will suffer greater wear than the upper part under the action of the earth's gravity. Compared with the horizontally opposed structure, the V-shaped structure also has similar problems.

, but this problem is undoubtedly much lighter."

When everyone compared the two engines, they couldn't help but nod: Isn't that the case? The cylinder of the Rotax 914 engine with a horizontally opposed structure is almost "lying" on the cylinder wall. Under the action of the earth's gravity, compared to

Engines with in-line structure and V-shaped structure naturally have more severe wear on the cylinder wall, especially the lower half of the cylinder wall.

Zhang Qihang went on to explain: "Of course, from a structural point of view, the horizontally opposed structure is the most suitable, but the reason why Rotax, Continental and Lycoming use horizontally opposed structures is because they have a series of cylinder wall wear-resistant technologies.

Including materials, coatings, processing techniques, etc., but our Huateng Industrial Group hardly has much high-tech accumulation in terms of cylinder wear resistance, so we can only settle for the second best and adopt a V-shaped structure."

I see!

When Zhang Qihang said this, everyone understood: In the aviation field, the horizontally opposed structure is more suitable, but Huateng Group has limited technology in wear resistance, so it directly uses structural avoidance to avoid the problem of cylinder eccentric wear.

I have to say that this is a very smart approach given the limited technical level.

Vice President Miao couldn't help but nod: "Indeed, the V-shaped structure you chose is indeed the most suitable for your unit's current situation... What's the second reason?"

"The second reason is the lubrication and cooling inside the engine..."

"I see," before Zhang Qihang finished speaking, Vice President Miao slapped his head and said suddenly: "That's right, why didn't I think of that?"

Lubrication and cooling inside the engine?

Many of the leaders present came from liberal arts backgrounds and only knew the most basic things about engines. For example, although everyone knew that engines needed lubrication and cooling, they didn't quite understand why it was related to the engine's cylinder structure.

Vice-President Miao, on the other hand, saw that everyone looked confused, and the little thought of showing off came to his mind. He smiled and explained to everyone: "Everyone knows that the engine relies on the circulation of coolant to cool the engine.

Yes, but in fact, in addition to coolant, engine oil also shoulders the tasks of lubrication and cooling.

In order to ensure lubrication and cooling, the engine needs to spray oil onto the cylinder wall when designing the internal oil circuit. Traditional in-line cylinders and V-shaped cylinders can easily dispose of the oil sprayed on the cylinder wall in time... Under gravity

Under the action of the oil, the engine oil will slide off on its own.

However, the internal oil circuit design of a horizontally opposed cylinder engine is a bit troublesome. As far as I know, some special designs are needed to ensure lubrication between the piston and the cylinder wall, and at the same time, the excess oil must be disposed of in a timely manner.

The V-shaped cylinder used by Huateng Group is very smart, they avoid this trouble directly from the structure."

"So that's what happened."

"It makes sense, it makes so much sense."

"I understood it too well before, but now that Dean Miao said this, I understand it all at once..."

…………

Regardless of whether everyone understood it or not, they all flattered me one after another, looking like "I learned a lot."

Zhang Qihang was no exception. He repeatedly expressed that what you said, Dean Miao, was very good, concise, concise and easy to understand.

"You're welcome, you're welcome," Vice President Miao, whose face was full of smiles and was obviously in a good mood after showing off, waved his hands repeatedly and said with a smile: "In front of these engine experts from Huateng Group, I am actually trying to do something in my class.

It’s a joke for everyone.”

"How could it be? Your explanation is the most understandable and easy to understand. We understand why Huateng Group does what it does. Who else is at your level?"

Everyone immediately showered him with compliments.

"Hehe...hehe..."

Finally satisfied, Vice President Miao was polite to everyone for a while, and then asked Zhang Qihang: "Xiao Zhang, when will your engine be officially installed on your aircraft?"

"It will take two or three years no matter what," Zhang Qihang said: "The airworthiness certification work for aero engines is very troublesome. The designed overhaul interval of our engine is 1,500 hours, and the ground endurance time is at least 10,000 hours. In addition, we

The designed maximum take-off altitude is 5,000 meters..."

"What? The design take-off altitude is 5,000 meters?" Before Zhang Qihang finished speaking, someone in the crowd exclaimed: "Doesn't that mean your helicopter can also take off on the Qinghai-Tibet Plateau?"
Chapter completed!