Chapter 196 (1/2)
Although I feel sorry for my mother, I understand a lot after Li Yulin's persuasion. Black cloud group now has a big tree to attract the wind. If it is holding a big flag and drum to celebrate its mother's birthday, it will inevitably be remembered by some fugitives. Some gains outweigh the losses. It's more affordable to send some money to employees.
Bao Zixuan returned to MIT for his thesis defense. He is outside these days. He is not like a student at all, but he has made great contributions to the school so that he can live and work freely in the school. All professors will be open to the student on this point, and Harry Roland has made it clear that he will be given a postgraduate place in computer science. It can directly enter the computer major in September.
On this point, baozixuan agreed after careful consideration. Many scientific research projects of heiyun have not been completed, and Yulin Institute of technology has not recruited teachers. Now it can take advantage of the opportunities to study and work in the United States. At least bring Chinese scientific and technological talents to Xiangjiang. This is one of his goals, and he will not hesitate to pay any price.
At present, Xiangjiang's science and technology talent reserve can not support the establishment of a science and technology professional college. Then we can only rely on our own efforts to make these people willing to teach and engage in scientific research in Xiangjiang on the grounds of high welfare, treatment and support for their scientific research projects.
The direction of this paper has been clear. Baozixuan developed a successful engine - three rotor turbofan engine in Luoluo company for nearly 10 years in his previous life.
In the past, this engine was developed by RORO in order to break the monopoly of North American Airlines on the engine market. It is an industrial pearl in the aviation industry.
The rotor engine was invented by German figash Wankel. On the basis of summarizing the previous research results, he solved some key technical problems and successfully developed the first rotor engine. The rotary engine uses triangular rotor rotation to control compression and emission, which is very different from the linear motion of the traditional reciprocating piston engine.
Comparison between rotary engine and traditional reciprocating engine: both reciprocating engine and rotary engine rely on the expansion pressure generated by the combustion of air-fuel mixture to obtain rotating power. The mechanism difference between the two engines lies in the way expansion pressure is used. In a reciprocating engine, the expansion pressure generated on the top surface of the piston pushes the piston downward, and the mechanical force is transmitted to the connecting rod to drive the crankshaft to rotate. For a rotor engine, the expansion pressure acts on the side of the rotor. Thus, one of the three faces of the triangular rotor is pushed to the center of the eccentric shaft. This movement is carried out by the force of two components. One is the centripetal force pointing to the center of the output shaft, and the other is the tangent force that rotates the output shaft.
In the following days, engineers developed a double rotor engine based on the rotor engine, but the double rotor engine had some defects in the aircraft. Now major aviation power companies are anticipating the three rotor engine.
The difficulty of adding a rotor to the engine increases in geometric multiples. People only assume that the three rotor engine is greater than the research. After all, the research and development of aeroengine can not be completed with a little money. It may take billions of dollars, take decades, and do not necessarily see the effect. Many enterprises in this regard are unwilling to invest money, resulting in only a few aircraft manufacturing enterprises in the world, and even fewer aircraft engine manufacturing enterprises.
In the field of aeroengine, the disadvantage of double rotor engine is that the diameter of fan and subsequent booster stage is large, and the speed can not be too high. Multi pole low-pressure turbine has to be matched behind the engine to reduce the speed of fan to the optimal speed as much as possible. A solution to this problem is to use a three rotor engine.
At the same time, you can also understand that the fan is equipped with a turbine drive to make the low-pressure, medium pressure and high-pressure rotors work to the optimal speed as much as possible. But this will also lead to other problems. One more shaft requires one more bearing, which will challenge the reliability, volume, layout and weight of the engine.
It can be said that the three rotor engine of the former Luoluo company was forced out by its competitors. Due to the limited size of the military market, the North American partners of civil aviation are now considering their own general and Pratt & Whitney. In the face of this embarrassing situation, Luo Luo decided to hold back his big move with his real ability, that is, the three rotor engine. Of course, one more rotor indicates one more core machine, which is more difficult to grasp in terms of matching difficulty.