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Different from the slightly twisted strip-shaped fan-shaped ordinary blades that Liang Yuan usually sees, the angle of twisting of the first-stage fan blades of the gas turbine is very large, and most of the blade planes can be seen from the elevation of the blade root to the tip of the blade, which can be twisted by at least 30 or 40 degrees more than the original fan blade.

Due to the increase of the distortion angle, the part of the new blade that reflects the light is much more than the original fan-like blade, under the reflection of the workshop roof light, the blade edge of the first-stage fan of the gas turbine looks very much like the cutting edge of the sharp weapon, as long as the visual angle is slightly off, the whole fan looks like it is bent into a weird S-shaped line.

Starting from the far end of the fan blade, at least half of the length is twisted and obviously swept back at a certain angle to the inside of the air intake, giving the whole gas turbine a feeling of struggling forward, and from the outside, it looks much more imposing than the original.

For Liang Yuan, a guy who often flew around in the sky in his previous life, the shape of this fan is really familiar, it is simply Airbus and Boeing, in the late nineties, began to be equipped with a new generation of aviation motors with high flow, small aspect ratio, and grazing fans.

Since the mid-90s, with the rapid development of the computer industry, some of the ideas for improving aviation motors proposed in the early years have gradually become within reach, among which the small aspect ratio and grazing blade technology are the most eye-catching.

In the era of information explosion, when countless aviation experts and professors mention the future technical improvement direction of aviation motors, small aspect ratio and grazing blade technology are one of the topics that must be mentioned.

The small aspect ratio and grazing blade technology are making the motor blades stronger. At the same time, it has better aerodynamic stability, and can also reduce the number of compressor stages of Spey's second-generation aviation engine from 12 to 13 to 8 and 9.

With the reduction of the number of compressor stages, not only the weight of the aviation motor is greatly reduced, the thrust-to-weight ratio is increased, but the reduction of related parts has a very positive impact on the reduction of manufacturing costs, maintenance intensity, failure rates, etc.

The intake fan blades are swept at a certain angle, and the same motor flow can be obtained at a lower fan rotation, and the swept blades have great advantages in simplifying the structure of the aviation motor, reducing and improving the aerodynamic characteristics and reducing noise.

At the same time, the inherent structure of the bending leading edge swept fan blades can cause foreign objects to be thrown into the outer duct of the fan through the centrifugal action of the fan blades, preventing them from entering the low-pressure compressor. Enhance the ability of aviation motor to resist foreign object damage.

In the United States, around 2ooo years, the United States began to use small aspect ratio and grazing blade technology. The latest modifications such as General Electric's F11OGE132 and F414GE4OO use small aspect ratio and swept blades to improve the performance of the motor.

Liang Yuan looked at this kind of familiar fan and was completely stupid, this is simply impossible. Be aware before the computer's performance improves to a certain extent. Take the small aspect ratio and the complex curved surface design of the grazing fan. The amount of computation and the difficulty of processing involved should be described in astronomical units.

In the forties and fifties, when computer technology was just in its infancy, the number of inviscous flow fields around a cone was calculated from 1943 to 1947. It took five years for human beings to solve the law of the fluid field around the cone during sound flight, thus breaking through the shackles of sound flight.

Mathematics is the mother of science, this sentence is not nonsense, without a thorough and detailed mass of operations as a foundation, all applied sciences and advanced technologies are mirages, buildings in the sky.

The difficulty of calculating the flow field on the surface of the small aspect ratio and grazing blade is at least 1oo times that of the surface flow field of a simple cone, and the linkage effect of the multi-stage low and high pressure compressor behind the first-stage fan is an impossible task for the performance of the electronic computer equipped in the science and technology park.

In the era when various CFD software was popular in later generations, the minimum hardware requirement for installing various CFD software must be 24G memory, dual-core or quad-core CUP, if it is installed on a single-core computer with a chip computing power of less than 10 billion/second, the whole set of CFD software will be about to die.

The two little girls looked at Liang Yuan with a stunned look, stabbed Liang Yuan a few times proudly, and said, "Aunt Liang is amazing, Xiaoyuan is stupid." ”

After a period of hard study, Li Yuanling's scientific research work has formed a very simple and straightforward cognition in the eyes of the two Loli, that is, the greater the difference between the appearance of the fan blades studied by Li Yuanling and the ordinary fan blades, it means that the more powerful this fan is, and of course, the more powerful Aunt Liang who researched this kind of fan.

Liang Yuan, who had heard the summary of the two little girls, thought speechlessly for a long time, and had to admit that the simple scientific view of the two loli was really in line with the real law of the turbofan motive.

Liang Yuan, who was poked a few times by the two little girls, came back to his senses, looking at the gas turbine in front of him with a metallic light, he still felt like he was in a dream, could it be that his wife was dreamed of by Einsteinto, but even if he found the empirical calculation formula and related constants of the small chord span ratio and swept blades, the real amount of calculation involved in this design is enough for more than 100 people in the gas turbine room to calculate for fifty or sixty years.

Liang Yuan decided to sell Meng to set Li Yuanling's words and see what was going on.

"Mom, that fan looks like qiguai, why are the blades bent inward, I haven't seen it on the air conditioning fan or the bladeless electric fan. Liang Yuan waved his palms and made the shape of a hook.

"Mom actually hid all the good things and didn't use them for me. Liang Yuanka said with his eyes open.

Li Yuanling reached out and twisted Liang Yuan's ear, and said with a smile: "Where is there something good to hide,"

"The prospect of the swept blades is good, but what is now in the shoes is more or less the same, which my mother is going to use to deal with the British in a few days. ”

Li Yuanling had some headaches as Liang Yuan explained, the small string spread, the sweeping blades, that a lot of boring scientific numbers and tempting prospects.

However, after listening to Li Yuanling, Liang Yuan immediately understood the mystery, after all, the gas turbine in the real room of the gas turbine is a high imitation of the pure Luo Luo Spey SM1A shipborne gas turbine, and if the original designer does not change it, he is afraid that it will be debunked on the spot.

Since Liang Yuan plans to continue to introduce vortex motors on Rollo's side, it is better to do less about this kind of thing that destroys his own image.

Li Yuanling tugged at Liang Yuan's ears and patiently explained the advantages and technical difficulties of the new blade.

Pretending to understand and nodded, Liang Yuan asked: "Didn't Mom say that she wanted to talk to Luo Luo about the introduction of equipment and technology, Mom put that kind of goods on the gas turbine, if you don't let the British see our technological level, what if those guys ask for a price?"

"Just because the new fan is a good thing doesn't mean the gas turbine won't work. Li Yuanling laughed happily.

"Xiaoyuan, do you remember what your mother told you about the mathematical model of the grazing fan, which your mother has preliminarily established?" asked Li Yuanling.

Liang Yuan frowned slightly and thought about it, and suddenly said: "Mom, you have replaced some uncertain variables in the formula with verified constants, that is to say, this fan can only work under a fixed number of revolutions, and there is no room for adjustment at all, but by modifying the engine speed of the gas turbine, it is completely possible to directly bring the entire gas turbine system to the working area of the grazing fan and then refuel and start." ”

In this way, it can completely make the masses who do not know the truth have some kind of illusion, thinking that we have made a major breakthrough in the technology of sweeping blades, and who came up with this idea, it is simply too bad. Liang Yuan couldn't help laughing when he said that.

According to some historical documents in the previous life, whether Britain and the United States decided to carry out real practical research on small chord span ratio and grazing blades, it would not be earlier than 1987, and under the current situation of limited computer computing power, it is impossible to achieve any major results.

It is completely conceivable how surprised and shocked the representatives of Rolls-Royce will be when the gas turbine in operation is actually using an intake fan composed of small aspect ratio and grazing blades.

"I knew that your mind wasn't in the right place, and you reacted quickly enough to this kind of thing. Li Yuanling said with a smile.

Li Yuanling's trick is in the same vein as when Wu Lao was just released from the cowshed when he introduced Spey, and he attacked Luo Luo's self-confidence at the negotiation table.

Liang Yuan smiled, quickly changed the topic, and asked, "Mom, I see that the curved surfaces of those swept blades are very complicated, how is the real yàn room processed?"

"First with precision forging equipment forging forming, and then find a fitter master to make it by hand, a total of 28 blades Lu Hengsheng seconded 28 grade 8 fitters from the Municipal Bureau of Industry, it took more than half a month to process. Li Yuanling said with some emotion.

Liang Yuan was taken aback when he heard this, this is in Shengjing City, which is known as the eldest son of the republic's industry, where can you find so many top fitters in a different place.

"The gas turbine room is basically ready, just waiting for the industry and trade delegation from Luo Luo to come to Shengjing. Li Yuanling said. (To be continued.) )