Zhang Lan suddenly realized: No wonder I look at how the engine looks like a motorcycle engine, it wasn't like it originally, it was simply it!

Zhang Lan nodded, the safe maximum speed is 17,000 rpm per minute, which is indeed a very amazing number, the maximum speed of the engine of the F1 car is only 18,000 rpm per minute, even if it is a MotoGP car, the maximum speed of the engine is only this number, the maximum safe speed is not so high, as for the ordinary car engine, forget it, even a fraction of the engine speed.

Although even as early as the 70s, the Americans studied in addition to the all-ceramic design of the gas turbine, and then in the 80s the Swedish Volvo company and the 90s the Japanese have also successfully developed their so-called ceramic engines, but the nature of the experiment is still the most: the record of the longest service life of the ceramic engine was created by the Americans, and the all-ceramic gas turbine they developed was used for 200 hours, which has no great practical value at all. As for the gas turbines developed by the Japanese and Swedes that can only be used for a few dozen hours, they are even more insignificant.

Zhang Lan really can't think of it, who wants to use it for 200 hours and change the engine? The engine on an ordinary car can be used normally for more than ten years, even if it is used for 2 hours a day, the ceramic engine and the metal engine are not comparable at all.

And it is very important to note that the so-called ceramic engines developed by these countries are all gas turbines, not piston internal combustion engines used in ordinary cars at all, even if the price of a small gas turbine is enough to buy dozens of Santana, the price factor naturally limits the promotion and use of this thing.

In Zhang Lan's view, an engine can be accepted by the majority of the people and made it affordable for the people to be regarded as a real success. in this regard. It contains the relationship between price and performance: the price can not be higher, but the performance must be much higher than the traditional engine, and more reliable, to make the car buyers feel that they spend more money, which can quickly promote this product. Otherwise, it will always be like a peacock showing off its beautiful tail feathers, which is of little use except for being beautiful.

Just when a few people were talking and Zhang Lan's cranky thoughts. The performance test of the engine has begun, and as the engine noise gradually increases, Zhang Lan imagined that the data next to the engine similar to that displayed on the computer monitor began to change constantly, and the fastest change was an analog instrument similar to the shape of a pointer. It's just that this analog gauge is different from the average car engine with a maximum gauge of just over 7,000 revolutions, and its gauge reaches an astonishing 25,000 rpm!

As the engine revs faster, the analog hand on the display is moving forward rapidly, and in the blink of an eye, the analog hand has passed a third of the entire dial, and the speed has reached 10,000 rpm.

Looking at some of the system data displayed on other monitors, Zhang Lan nodded while looking at it: Hmm. The oil supply system is normal, the lubrication system is normal, and the heat dissipation system is ...... Well? That's not right. Why is there no cooling system?! Zhang Lan's eyes widened and she searched for several monitors. I was stunned that I didn't find a display information related to heat dissipation.

No way? Zhang Lan felt that her head was a little stupid, and she couldn't turn around: yes. Although because of the unique high temperature resistance and high strength characteristics of ceramics at high temperatures, ceramic engines do not need to cool down the complex engine cooling system such as water cooling system. It can also ensure the normal operation of the machine, but the necessary air cooling still needs to have ground. Even if it is ceramic, there is a temperature limit.

If you look closely at the radiator-like stuff on the engine cylinder, is this thing relying on this thing to passively dissipate heat from the engine? Well, I have to say that what Lao Xie Tongshoe said is not wrong at all, this is really *** a test of the limit of the engine!

Finally, under the unremitting efforts of Zhang Lan's children's shoes, after looking for a long time, Zhang Lan finally found something similar to a thermometer on the screen of a certain monitor, which is showing the working temperature of the engine, and now, the data displayed on it is less than 1000 degrees Celsius. \\

Everything is running normally, the analog pointer indicating the engine speed is still flying forward, and the curve graph indicating the engine power output and engine torque output is also constantly rising to higher ground.

When the engine speed reaches 12,000 rpm per minute, the output of the engine has reached an astonishing 42 horsepower, and with the increase of engine speed, look at the steady rise of the engine power output curve, there is no intention of slowing down! As for the torque output, from the engine speed reaching 6000 rpm, until the current 12000 rpm, the engine power output and torque output curve display displayed next to it has been kept at a high level, and it is still rising! This means that the maximum torque output of this engine has an astonishingly wide range!

Looking at the fuel consumption again, Zhang Lan is really a little dumbfounded this time: in the current situation of such a high speed, the instant fuel consumption of the engine displayed by the instrument is only 2 liters, which means that the motorcycle using this engine runs on the road at this power, and the fuel consumption per 100 kilometers of the engine with an output of 4 horsepower and an exhaust of only 250 ml is only 2 liters!

Now Europe, the United States, Japan and other most advanced, the average fuel consumption of motorcycles with high-efficiency active water-cooled 250 cc displacement engines is generally about four oil per 100 kilometers, and the maximum output power of the engine is generally between 35 horsepower and 42 horsepower - the power of air-cooled engines is lower - but if you want to achieve this maximum output, you need to add the throttle to the end, and the fuel consumption at this time is not four oils, at least more than eight oils!

And now, with the same output power, this ceramic engine with passive heat dissipation only needs 2 oils!

Such low fuel consumption is inextricably linked to the unique characteristics of ceramic engines: because ceramics are more resistant to high temperatures than traditional heat-resistant alloys, the thermal efficiency of ceramic engines can be improved by about 30 to 40 percent compared with traditional metal engines. \\\\\ also means that under the same output power, the fuel of the ceramic engine is burned more fully, and the fuel consumption is naturally lower; And when the ceramic engine and the traditional metal engine achieve the same fuel consumption, the output power of the ceramic engine is greater! ,

This means that Zhang Lan is very clear: under the condition that the safe speed of the engine can be increased by another 5000 rpm, the output power and output torque of this passive heat dissipation ceramic engine have comprehensively surpassed all current motorcycle engines with a displacement of 250 cc!

Even the 250 cc engine used on the Alice-Ducati Diana MARK-5S, the most efficient in his own company and has always been the pride of Alice Motorcycles, is no match for this ceramic engine in terms of power, torque and fuel consumption, or rather, the two engines are not the same level - although their displacement is the same.

What happens if the engine reaches its maximum safe speed of 17,000 rpm? Zhang Lan was a little apprehensive and looked forward to it.

While looking forward to the ultimate performance of this engine, Zhang Lan is still pondering the two biggest advantages of this ceramic engine: first, because it eliminates the complex active water cooling system, not only the weight of the engine is reduced a lot, but also the structure of the engine can be designed to be simpler than the traditional metal engine; Second, because of the use of ceramic materials that are lighter than metal, and the weight of the engine reduced by the previous cooling system, the weight of the entire engine can also be about a third or more lighter than that of a conventional metal engine. This lighter one-third of the weight invisibly increases the power factor of this engine!

These data make Zhang Lan look a little smacked, no wonder almost all engine industry insiders have such high expectations for ceramic engines, and foreign countries are also sparing no effort to develop ceramic engines: what they are now doing is only the first generation of ceramic engines, or laboratory samples, has reached this level. If the technology continues to mature and improve in the future, what about the overall performance of the second and third generations of ceramic engines? What would that look like?

With the increase of engine speed, the working temperature of the engine displayed on the instrument has reached 1100 degrees Celsius, Zhang Lan knows that the working temperature of the ceramic engine can reach between 1200 degrees Celsius and 1400 degrees Celsius, but I don't know how much the maximum working temperature of this engine can reach?

"Xie Gong," thinking that he was about to ask if he didn't understand, Zhang Lan turned his head and asked Xie Fei, who was also nervously staring at the data on several monitors, "What is the theoretical maximum operating temperature of this engine?" ”

"1300 degrees Celsius," Xie Fei stared closely at the data displayed on the monitor in front of him, and said to Zhang Lan without turning his head.

Khan, ignored! Zhang Lan touched her nose: Is it 1300 degrees Celsius? Well, it seems that this is also a very high figure, if you remember correctly, in 1977, the Americans made an all-ceramic gas turbine, its working temperature can reach up to 1230 degrees Celsius; In 1982, the gas turbine jointly developed by Volvo United Company in Sweden has a maximum operating temperature of l10 degrees Celsius. Xie Gong, this thing they made really exceeded the limit of what their predecessors could do, how did they do it?

PS: I haven't canvassed for a few days, oh, uh, I don't know how to say it, but it's just that the big ones say that Tongtong has an outbreak of four watches every day, and it's very tiring. If you think it's okay, if you can support it, support it, Tongtong, thank you, bow

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