Chapter 172 Suggestions on "technological regression" (3k)
Listening to the difficulties and problems of the engine, Gao Zhendong thought for a while and put forward a suggestion on "technological regression": "How about we use a two-stroke diesel engine? ?”
Two-stroke engines are not unfamiliar to those who work on engines, at least the principle is not unfamiliar.
Some people objected to this suggestion immediately: "Buy a new two-stroke? It's hard to say in time, but compared with four-strokes, two-stroke combustion is incomplete, fuel consumption is high, and torque is low. Isn’t it a bit backwards?”
Because two-strokes always have some incompletely burned gas emitted with the exhaust gas, the fuel consumption is higher, and this thing naturally burns engine oil.
This burning of engine oil is not like some cars that will burn engine oil due to engine defects in the future, but the engine oil in this engine is directly mixed with the fuel into the combustion chamber for combustion.
Gao Zhendong said: "But the two-stroke has low technical difficulty, simple structure, and no complicated valve mechanism. The biggest advantage is its small size. It can do one work in two rotations, and the power density is the same under the same conditions. It is much higher than the four-stroke. The more difficult thing for us now is whether there is any problem.”
This is indeed the advantage of the two-stroke, Lao Maozi’s two-stroke 5TD/6TD power. The volume of a power bag is about 3 cubic meters, while a Western power bag is about 6 cubic meters. The difference in volume and weight is huge.
Of course, this is also related to the relatively simple transmission mechanism of the Laomaozi tank.
Their idea is very simple, as long as it can meet the standards, as for comfort, they will come later.
"Mr. Gao makes sense. It seems that it is not impossible to get one."
"Well, small torque is relative. As the power increases, the torque can keep up."
"It seems to match our technical capabilities better."
"Is it possible to modify the one on the 5DL?"
"That one has limited potential, but it seems to be OK as an alternative. ”
Mr. Luo was having trouble making a decision for a while. He looked at the comrade in charge of power: "What do you think?"
The comrade in charge of power also thought for a long time: "Change the old and create new ones, and create new ones." Is it a stroke or a new two-stroke? This is indeed not easy to grasp. Should we study the advantages, disadvantages and rough indicators of several plans, write them all into the plan, and wait until the National Defense Work Committee makes a demonstration together? Put it forward and ask them to choose?”
Mr. Luo also thinks this is a way. After all, there is no concrete thing about two-stroke. It just has many advantages in principle, but it has not been studied yet. Find out exactly how far it can go.
It is better to study it first. When the parameters such as cylinder diameter, compression distance and air intake volume are determined, the approximate output power range can be calculated.
This matter was handed over to the comrade in charge of power. It is most appropriate for him to handle this.
At this point, the matter has almost been discussed. Gao Zhendong looked at the final meeting resolution and almost laughed out loud. Putting aside some nuances, except for the night vision equipment and power package that have not yet been determined, this thing is simply top-notch. Designed with the T-64's forehead in mind, some indicators or subsystems are even better than the T-64.
Mr. Luo was also very satisfied with the outcome of the meeting and said with a smile: "Everyone, it seems that the indicators of our new tank are still very high. If it is brought to the world, it will probably not be inferior."
After saying that, he turned around and joked with Gao Zhendong: "Mr. Gao, you see that you have already helped with firepower and protection. When should you favor comrades who are mobile, haha."
< br>Gao Zhendong smiled and said: "Mr. Luo, didn't you just make a suggestion? I am really optimistic about the two-stroke diesel engine. I will get one and use it first, and at the same time, I will gradually develop the four-stroke engine, haha."
< br>The comrade in charge of the engine said: "Well, I will make a good estimate of the parameters of the two-stroke engine after the meeting. If the volume and weight advantages are outstanding, other shortcomings are not unacceptable at this stage."
Another day later, Gao Zhendong and Mr. He came to Mr. Luo for a small-scale report with the improved bi-stable plan.
Mr. Luo looked at their final decision and said with a smile: "First make full liquid backup, and the ultimate goal is to prepare full electric power?"
Mr. He nodded: "Yes. I have estimated that the production of full liquid should not be slow, and the certainty is still very high. As for full electricity, with the support of Director Gao, I am very confident now. After all, this thing has so many advantages that it would be a pity not to do it. ”
“Moreover, Director Gao’s book actually designs more than half of the all-electric equipment from its principles to its configuration. I’ll take advantage of it, hahaha.”
Mr. Luo laughed loudly: "You know how to be lazy, okay, let's just write it into our internal demonstration results."
At this time, Mr. Lu, who was in charge of the engine, came to Mr. Luo excitedly.
"Mr. Luo, I've done the math, the two-stroke is really a bit messy."
"Oh? Tell me, what's going on."
"Rough According to preliminary estimates, taking into account unfavorable factors such as incomplete combustion, it is estimated that the power of a two-stroke engine is more than 60% greater than that of a four-stroke engine with the same displacement, and its structure is simple and its volume can be more than 35% smaller.”
"What are the disadvantages?" "Compared with the power increase, the torque is smaller, but it is within an acceptable range. And the fuel consumption is high. Fortunately, part of the remaining space can be used to increase the fuel capacity, and the stroke is basically not affected. Also It just doesn’t run as smoothly as a four-stroke.”
Gao Zhendong smiled and said: "If you want to increase stability, I have a way."
Gong Lu was overjoyed, General Master Gao finally looked at us: "I knew Mr. Gao must have great opinions, haha, I'm all ears."
Although Gao Zhendong didn't have the design drawings of 5TD/6TD, he knew the basic structure. He took out a pen and paper and started drawing.
Mr. He, who had already experienced it, smiled and said: "As soon as Director Gao drew the picture, I knew there was something good."
Gao Zhendong explained while drawing: "You are considering an in-line configuration now, right? I am considering changing to a horizontal offset configuration. We lay the upright cylinders flat, facing each other, and eliminate the cylinder head in the middle of each pair of cylinders. , combining two cylinders into one. "
This looks a bit like a horizontally opposed engine, but the cylinder direction is reversed.
As soon as these words came out, Lu Gong's eyes lit up: "This can balance the vibration to the greatest extent, and the mechanism on the top of each cylinder can also be eliminated. Although there is an extra crankshaft, in general , or further reduced the size.”
In a few words, Gao Zhendong also finished the diagram and said: “In this case, the engine will be flat, with a low center of gravity, regular shape, simple structure, and no effective space. Less, it can maximize its advantages."
"Of course, it is not without its shortcomings, the width is large, but it is not bad for a tank, and this structure is best to use a large diameter and short stroke. The piston, in this case, needs to increase the speed. As you know, the low-speed torque is average, but it is acceptable.”
"There are also some other minor problems, but they are all acceptable."
Gong Lu took this simple schematic diagram, and the more he looked at it, the more wonderful it became. He maximized the advantages of the two-stroke, while also minimizing the disadvantages. Within the acceptable range.
Mr. Luo's eyes lit up when he heard this. Maybe a two-stroke diesel engine can really be used. If there was no objection before and including it as an option would bring some face to Deputy Chief Gao, then now Once this estimation result and the configuration that Gao Zhendong calls "horizontal hedging" come out, it seems that it is really possible.
He said to Lu Gong: "Then you should work hard and do preliminary research according to the configuration of Chief Engineer Gao, and make the relevant content of our internal demonstration results more solid."
< br>——
Gao Zhendong stayed at the Prairie Tractor Factory for eight days, and he probably gave Mr. He and others a review of the book on tank gunning stability. Other achievements were quite fruitful, especially together with everyone, we basically set the indicators for the next generation of tanks. , he also played a key role in several key indicators.
Seeing that what happened here is over, he is about to return to the capital. The three young comrades arranged by Mr. He to study with him in Beijing will go to Beijing soon.
When he was leaving, the people at the Prairie Tractor Factory prepared many gifts for him, but he declined them all. He couldn't bring them with him, except for a woolen scarf for Lou Xiao'e.
However, he did pick up two 105-gun shell casings and some 12.7 high-speed aircraft shells. Mr. He saw that he liked this, and got him a fin-stabilized sabot and an armor-piercing shell holder. The bullet core is just a metal stick and is not dangerous.
Of course, if it is an armor-piercing bullet from Citigroup, it is hard to say.
Gao Zhendong didn't refuse. Men have no resistance to these things.
After spending more than 30 hours on the train, Gao Zhendong returned to the capital.
It was noon when he got off the train. He did not go to the factory. The train ride was really tiring, even in the sleeper berth.
Bus, walking, he returned to the yard.
As soon as he entered the door, Gao Zhendong saw Lou Xiaoe.
When Lou Xiao'e saw him, she jumped up with a cheer and hung her head around his neck.
Gao Zhendong was a little surprised: "Xiao'e, why are you here?"
Lou Xiao'e smiled and said: "Didn't you say ten days? I guess you will be back soon. This I have been waiting for you at your house during the day for a few days, haha, I must have caught him.”
Gao Zhendong was undoubtedly happy when he saw Lou Xiaoe as soon as he could go home. He put down his luggage and looked from inside. Take out what you brought back.
Lou Xiao'e wrapped a woolen scarf around her neck and walked around in front of the mirror. The little girl was very happy that Gao Zhendong remembered to bring gifts for herself when he was on a business trip, and she even took two high-end computers. Eject cartridge casings.
Seeing that the Chinese New Year is coming soon, Lou Xiao'e thought of something: "Zhendong, the Chinese New Year is coming soon, are you spending it at my house?"
Gao Zhendong thought for a while, the most important thing is to spend it with Lou Xiao'e. OK.
"Here at noon, go to your house in the evening, so that both ends are taken care of."
After receiving Gao Zhendong's affirmative answer, Lou Xiao'e was very happy that Gao Zhendong could spend the New Year at her house. , which is very symbolic to her.
(End of this chapter)