Set sail1992

Chapter 615 Give Leaders and Opportunities to Show Off
"Robinson R44?" Vice President Miao couldn't help nodding when he heard the words, he really knew about this brand new product of Robinson Company: "Indeed, compared with R22, R44 has a wider range of application... But Xiao Zhang Comrade, you are developing two engines at the same time, are you busy?"

Although Vice President Miao said the last sentence in a joking tone, it also indirectly expressed his attitude or worry: Will you be too greedy to chew?

"Thank you for your concern." Zhang Qihang first expressed his gratitude to Vice President Miao, and then said: "As for the problem of being too greedy, the leader is actually like this. When developing the engine, we adopted the same method as the traditional engine The development process is different, we have adopted the most advanced modular development concept in the world today."

"Modular concept?" Vice President Miao couldn't help raising his eyebrows when he heard this, with a look of great interest: "Can you explain it to me carefully?"

As the main leader of the Air Force Academy, of course he has heard of the concept of modularization, but more in the field of equipment, such as when designing a fighter jet, integrating a certain function into an independent but cross-linked system with other systems module, and adopts a quick-release design, which has the advantage of improving the ease of maintenance. Once this module fails, it can be quickly removed and replaced with a new one, allowing this fighter jet to Restore combat effectiveness.

After the concept of quick repair based on the battlefield was put forward, it immediately received the attention of military equipment research and development units in various countries, and they began to study modular technology one after another. Naturally, our country's military equipment research and development and manufacturing units are no exception. We are developing our modular technology, but what about the modularization of the engine?

Vice President Miao, who was very interested in this matter, felt more and more that his trip to Langya came at the right time.

"Of course," Zhang Qihang nodded and said, "Engine modular technology, in simple terms, is to develop an engine. First, determine the cylinder bore and piston stroke of this 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 basic power you want by combining different numbers of cylinders like building blocks according to your own needs; after that, you can get the power you want by adjusting the intake, exhaust, and turbo boost values. The power ... that is to say, from the beginning, the performance of the engine was doomed. "

"That's a good idea," Vice President Miao also knows technology. After hearing Zhang Qihang's brief introduction, he immediately understood the benefits of this modular development concept: "In this way, it means that if you master the V4 engine One of the technologies, it is natural to have mastered the V6 and V8 technologies.”

"I can't say that, I can only say that we have a certain foundation," Zhang Qihang explained shyly, "Compared with V4, V6 and V8 engines are more complicated, and it still takes some effort."

"..."

Vice President Miao was speechless: Are you being modest?Is it modest?
Unwilling to entangle with him on this issue, he asked instead: "By the way, Comrade Xiao Zhang, I see that your engine uses a V-shaped structure. Why didn't you use piston-type aviation engines such as ROTAX, Continental, and Lycoming?" The horizontally opposed structure commonly used by engines?"

This is what Vice President Miao was curious about.

After hearing the question asked by Vice President Miao, the others couldn't help becoming curious, and asked Vice President Miao about the structure of the piston aero-engine. Under Vice President Miao's explanation, everyone just Understand, in the field of piston aeroengines, a generally recognized general cognition is:

In the field of high-power piston-type aeroengines, the structure of the engine is basically star-shaped. The Jiao-29 trainer aircraft, the Yun-3350 transport aircraft and the Zhi-6 helicopter also use radial air-cooled engines;

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

Under such circumstances, the two V-shaped aero-engines of Huateng Industrial Group seem a bit strange-everyone didn’t find it strange before, after all, everyone has seen a lot of V-shaped engines on cars, but now After listening to Vice President Miao's explanation, everyone began to wonder why Huateng Industrial Group did not learn from the "predecessors" of low-power piston aero engines such as ROTAX, Continental and Lycoming, but instead used a V-shaped structure in a different way?
"There are two main reasons why we choose the V-shaped structure," Zhang Qihang talked eloquently under the gaze of everyone: "The first reason is to avoid the partial wear of the piston and the lower half of the cylinder. We have a ROTAX914 here. You can know from looking at this engine that the lower half of the engine with horizontally opposed structure will wear more than the upper half under the action of the earth's gravity. Compared with the horizontally opposed structure, although the V-shaped structure There are similar issues, but certainly this one is much less severe."

When everyone compared the two engines, they couldn't help but nodded: Isn't that the case? The cylinder of the horizontally opposed ROTAX914 engine is almost "lying" on the cylinder wall. Under the action of the earth's gravity, compared with Engines with in-line structure and V-shaped structure are naturally more severe in terms of wear on the cylinder wall, especially the cylinder wall in the lower half.

Zhang Qihang then explained: "Of course, from a structural point of view, the horizontally opposed structure is the most suitable, but the reason why ROTAX, Continental and Lycoming adopt the horizontally opposed structure is because they have a series of cylinder wall wear-resistant technologies, Including materials, coatings, processing techniques, etc., but our Huateng Industrial Group has little high-tech accumulation in cylinder wear resistance, so we can only settle for the next best thing and adopt a V-shaped structure.”

That's it!

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 adopts the method of avoiding the structure to avoid the problem of partial wear of the cylinder. I have to say that this is a very smart approach when the technical level is limited.

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

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

"So that's how it is." Before Zhang Qihang finished speaking, Vice President Miao slapped his head and suddenly said, "That's right, why didn't I think of that?"

Lubrication and cooling inside the engine?
Many of the leaders present were from liberal arts backgrounds, and they 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 had anything to do with the cylinder structure of engines.

On the other hand, Vice President Miao, seeing everyone's confusion, showed a little bit of careful thinking in his heart, and explained to everyone with a smile: "Everyone knows that the engine cools down by the circulation of coolant. Yes, but in fact, in addition to the coolant, the 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 onto the cylinder wall in time... in gravity Under the action of the oil, the oil will slide down by itself.

However, the internal oil circuit design of the horizontally opposed cylinder engine is somewhat troublesome. As far as I know, some special designs need to be adopted to ensure the lubrication between the piston and the cylinder wall, and at the same time ensure that the excess oil is disposed of in time.

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

"So that's what happened."

"It makes sense, it makes sense."

"I didn't understand it too well before, but now I understand what Dean Miao said..."

…………

Regardless of whether everyone understood or didn't understand, they flattered one after another, with the look of "I have learned a lot".

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

"You're welcome, you're welcome," Vice President Miao, who was in a good mood after showing off his face with a red smile, waved his hands again and again, and said with a smile: "In front of these engine experts from Huateng Group, I'm actually playing tricks at the door of the class. Let everyone see the joke."

"How could it be? Your explanation, the leader, is the most easy to understand. We understand why Huateng Group does this. Who else has your level?"

Everyone immediately burst into compliments.

"Hehe...hehe..."

Finally satisfied, Vice President Miao and everyone were polite, and then asked Zhang Qihang: "Xiao Zhang, when will your engine be officially installed on your plane?"

"No matter what, it will take two or three years," Zhang Qihang said, "The work of airworthiness certification for aero-engines is very troublesome. The interval between overhauls of our engine is designed to be 1500 hours, and the ground durability is at least 10000 hours. In addition, we The designed maximum take-off altitude is 5000 meters..."

"What? The designed take-off altitude is 5000 meters?" Before Zhang Qihang finished speaking, someone in the crowd exclaimed: "Doesn't that mean that your helicopter can also take off on the Qinghai-Tibet Plateau?"

As soon as the leader's words came out, the eyes of the other leaders lit up, and everyone stared at Zhang Qihang: What do you mean?Can Huateng Group's helicopters be used on the Qinghai-Tibet Plateau?
(End of this chapter)