What kind of things will develop in agriculture in the end, Li Zhao doesn't know, anyway, the bait has been sown, and he has already given the solutions that other countries want to help, what direction will this matter go, Li Zhao doesn't know, and it's not something he can control. Although Li Zhao is evil and has taken out a lot of things, after all, he is not visible, his influence is really limited, and all he can do is complete the work in hand.

At this time, Li Zhao could only sigh and said, "Inviting so many people this time, it seems that the invitation is wrong, but if you don't invite them, only invite Ambassador Da Mao, it seems too deliberate, and it is really a dilemma."

Father Su said at this time: "This matter can't be said wrong, at most, let them know a little earlier, we have such a big publicity, they will be able to find out sooner or later, maybe they will come over one day, after meeting, they will also apply for assistance, but we invited them over and triggered this matter in advance."

Regarding the current situation, Li Zhao had no better way, so he had to say to Su's father: "This matter, it is best to talk to the superiors, show our thoughts, and leave the investment to a powerful country, we will try to only provide technology, at most allow them to learn technology, otherwise it will be bad if they are coerced."

Li Zhao's idea is very simple, the advice given by the factory is that we don't pay for it, after all, it's a poor country, let's just come up with technology, and even we can make an idea without technology, as for where it will go, who knows? After chatting with Su's father for a while, Li Zhao went back to continue to work on his affairs, the research of the engine is already a little small, and a round of modification, manufacturing and a new round of tests will start in the near future.

With this period of high-intensity test, the first batch of nine engines began to enter the scrapping stage one after another, the first of which was scrapped is the one that opened the afterburner, because of the afterburner, so this one is mainly used to study the impact of afterburner on the engine, such a test has been carried out many times, and each time will cause more obvious damage to the engine, which also leads to the fastest scrapping of this engine.

There are many reasons for the damage, one is the high temperature, after the afterburner is turned on, it reaches a thrust of 16000 N, at this time the temperature of the combustion chamber and the turbine are very high, although there is lubricating oil to cool it, but the damage is inevitable. In fact, for many operating equipment, in addition to lubrication, lubricating oil also has a role to cool down, of course, different equipment lubricating oil is used to cool down in different ways.

General ground large-scale operation equipment, there will be a separate oil cooling system, this system will circulate the lubricating oil in the equipment, through a cooler, with circulating water to cool the oil, of course, this method is not suitable for the aircraft, for the aircraft, every bit of weight is needed to be carefully calculated, obviously it is impossible to install a lubricating oil cooling system with circulating water for the engine, the lubricating oil here is mainly air-cooled.

When the engine is overheated, a part of the lubricating oil will be discharged into the combustion chamber, so as to burn off the overheated lubricating oil and increase the flow of lubricating oil, so as to reduce the temperature of the lubricating oil as much as possible and realize the cooling of the engine shaft and bearing. As for the outer duct, it is simple, after all, part of the intake of the engine itself will cool the outer wall of the inner duct through the outer duct, so as to protect the outer wall of the inner duct.

Therefore, the engine really bears high temperature is the turbine and shaft, among which the turbine is the most, after all, it is the high-temperature gas generated during combustion that drives the turbine to rotate, and the higher the temperature, the higher the temperature.

The maximum temperature that the engine needs to withstand now is 1,800 degrees, which is almost visible to the naked eye for the damage to the engine. For this situation, Li Zhao also has no good way, he knows that there is a high-temperature resistant coating, but this aspect is exactly what he is not good at, designing this engine, is the first time he has been exposed to such a high temperature, and he has not been exposed to this high-temperature working environment in the past.

This kind of high-temperature environment is not used in many occasions, and it is often related to high-precision technology, which is not at all accessible to ordinary machinery factories. Compared with the current environment of this engine, Li Zhao's previous exposure to the environment can only be regarded as a low-temperature environment, after all, the highest temperature he has been exposed to in the past is only one thousand four

It's just 500 degrees, and you don't need it at all.

In the face of this situation, Li Zhao has no good way, in addition to limiting the maximum afterburner thrust, he can only hand over the research related to high-temperature resistant coatings to the research institute, so that they can find suitable coating materials. For the current Li Zhao, there is only one way to limit the maximum thrust, after all, reducing the maximum thrust can cool down.

In addition to high temperature, the second cause of damage is actually related to thrust, that is, with the increase of thrust, the speed of fans and turbines is also accelerating, when the speed reaches a certain level, the speed of damage to parts will also increase, especially when the temperature rises, the speed of damage is also significantly accelerated.

Most of these research results come from this engine that is about to be scrapped, and through the study of this engine, a lot of data has been obtained, the most important of which is the results on the service life of the engine.

First of all, the maximum afterburner is opened, the maximum thrust is above 16000 N, and after the temperature of the front end of the turbine reaches more than 1,800 degrees, although a high-temperature resistant alloy is used, the life of the final engine is also greatly reduced. According to the calculation of the test results, the approximate inference finally obtained shows that if the maximum afterburner is opened, then basically it will be scrapped for five minutes at a time, and it will be scrapped at most ten times, if it is a little smaller, in the case of one hundred and fifty thousand Newtons, it is estimated that it can be driven for ten minutes at a time, and it is estimated that it can come more than a dozen times, such an effect, Li Zhao is also relatively satisfied.

The reason for this is also very simple, when it is 16,000 Ox, the temperature is too high, and when it is 15,000 Ox, the temperature is actually not low, there are 1,700 Ox, and at this time, the reason why the speed of damage is also very fast, mainly due to the fact that some parts do not meet the requirements, which can be improved.

And if you don't open afterburner, such as only half thrust, then the damage to the engine is very small, at this time the engine speed is very small, it is estimated that it is not a big problem to use tens of thousands of hours, and if it is full thrust, reaching 13000 N, then it is estimated that the first overhaul time of the engine will be more than 500 hours, between 600 hours, plus maintenance, with 2,000 hours should be no problem.

Li Zhao is a little too satisfied with this lifespan, after all, this is equivalent to a maximum of one year, the aircraft will have to overhaul the engine once, and after about four years of use, two engines need to be replaced, which is too much consumption.

You must know that this engine is very expensive, if you count the cost of testing and equipment investment, one is at least a few million, even if you don't count the cost of equipment, it is worth at least one million, so that three or four years to replace two, the cost of use is too high. Moreover, this service life is still the case when Li Zhao used the metal formula after 60 years, and at the same time, there is no vector nozzle, and the structure is much simpler.

You must know that these metal materials can form a generation gap with this era, just like high-temperature resistant materials, with a difference of 60 years, the temperature resistance is directly more than 400 degrees. At the same time, whether it is in terms of structural strength, toughness, wear resistance and other properties, it can be rolled for this era. Not only that, Li Zhao also has an engine as a reference, but it is still a bit unsatisfactory in terms of service life.

After all, when the thrust dropped to one hundred and thirty thousand newtons, the temperature had dropped a lot, only about 1,400 degrees, and this temperature could barely be reached even if it was a metal of this era, and Li Zhao was quite dissatisfied with this.

Of course, some people may ask, why not directly use the drawings that have been seen, the reason is also very simple, that is, the thrust of that engine is a little small, the maximum thrust is only less than 13000 N, Li Zhao feels a little too small, after all, the engines he saw on the Internet have begun to run to the maximum thrust of 190000 N. At the same time, the thrust-to-weight ratio is also relatively small, less than eight, Li Zhao is very dissatisfied with this thrust.

In this case, Li Zhao of course hopes to be able to come up with an engine with higher thrust, so he uses the highest thrust of that engine, 13,000 N as the maximum thrust without afterburner, and the maximum thrust after opening afterburner is set at 16000 N, after all, Li Zhao is very envious of the power of the bricks.

However, now, it obviously makes Li Zhao scratch his head a little, one is that in the case of maximum thrust, the temperature will reach 1,800 degrees, and in the case of no high-temperature resistant coating, the metal material is really a bit carryable

Now, if we want to solve this situation, one is to continue to study metals, one is to resist high temperatures, and the other is to reduce the maximum thrust to 1,800 degrees Celsius, or a little more.

At present, the easiest thing to achieve is obviously to limit the maximum temperature, which must only be achieved by limiting the maximum oil supply, relatively speaking, the other two things will not be able to be studied for a while.