Chapter 1080 I still have no choice but to go back to the Chinese people
For those who have not participated in the turbofan 10 project establishment process, what Chang Haonan told can be said to be a horror story——
Co-authored the turbofan 10, which has reached the upper limit of mass-produced military aviation engines, or was it just someone else who stopped tinkering with it?
Several big guys in the materials field are even more ashamed.
Although Chang Haonan didn't say it, everyone knew it was clear in their hearts.
The reason why compromises were made on the basis of advanced structures and even reverse optimization was largely due to the limitations of aviation materials.
Although the field of materials, especially the field of composite materials, has made certain progress in recent years, it is obvious that compared with the needs of the application side, it is still somewhat inferior...
Sitting there Jiang Fuhe, who was in the second row, could only smile bitterly in response.
It was Chang Haonan who almost suddenly came up with the design of the Turbofan 10, and even left enough room for future development into a fourth-generation engine, that made him and the Gas Turbine Research Institute have to give up. The high-profile pre-research project at hand has turned to research on vertical take-off and landing technology.
Although it can be regarded as a way out, everyone knows that China must use large aircraft carriers as the core of its ocean operations in the future, and there is no such thing as a full-scale nuclear war during the Cold War, with all airports expected to be destroyed. In this scenario, there is no separate Marine Corps as a military branch.
A pure vertical take-off and landing model...it can only be said that the future is uncertain.
Of course, the 624th Institute has not been sitting still in recent years, and has also conducted a lot of research on thrust vector nozzles and related control logic.
But compared with the complete aircraft engine model, these are all details after all.
"Install the intercooler on the compressor stator..."
Liu Zhenxiang, who was in the front row, whispered again:
"If I heard this idea two hours ago, I'm afraid I can only call it whimsical... But now, I'm not so sure..."
He said with a half-wry smile and half a smile. He shook his head happily.
Just now, for a moment, he suddenly realized that perhaps it was time for people of his generation to show off their remaining energy...
But now is definitely not the time for emo.
Therefore, he quickly got over the initial shock.
After all, it is a project preparation meeting, not a simple pre-research.
In addition to the technical route, there are more specific issues that need to be discussed:
“Comrade Haonan, you just said that using partition wall heat exchangers for direct heat exchange of hot and cold end airflow , Will this affect the heat recovery or even the efficiency of the film cooling system?"
This time, Chang Haonan nodded very simply:
"To a certain extent... Indeed it will.”
"Actually, my initial plan was to use supercritical carbon dioxide as a heat exchange intermediate medium to transfer heat in the system... However, in principle, our research on the properties of supercritical fluids is not mature enough, so we rashly added Injecting it into the system may bring immeasurable risks.”
“On the other hand, in engineering, driving the intermediate medium circulation requires external power input, and although carbon dioxide can easily reach a supercritical state, it also requires. The pressure is more than 75 atmospheres, even much higher than the normal working pressure inside the turbine, not to mention the compressor part where the environment is relatively mild. Therefore, in order to ensure the structural integrity of the heat exchanger, it is necessary to set up an additional metal tube wall with sufficient strength... …”
“Although large bypass ratio aviation engines do not particularly pursue thrust-to-weight ratio, for the AE1500, a model with a thrust of less than 15 tons, it is still a bit difficult to fully accommodate such a set of things... Actually In order to offset the additional weight brought by the current intercooler and the larger size of the wind chiller, I have used a large amount of lower-density titanium alloy on the fan blades based on the experience gained during external cooperation.”
“That’s why I said before that at this stage, I plan to focus on the intercooler. As for the complete intercooler heat exchange equipment, it is more suitable for use in models with greater thrust. For example, the Trent 900 On a 30-ton aircraft engine like that..."
It's hard to say whether it was intentional or unintentional, but Chang Haonan revealed his greater ambitions at this moment.
AE1500 is definitely not the end...
The project preparation meeting can only be regarded as the starting point of a huge project.
In the following days, the expert group reviewed various documents and preparations prepared by Haofei Group in stages.
Finally, on May 31, 2003, the Aerospace Power Group’s AE1500 large bypass ratio turbofan engine project request was officially approved.
And, it is extremely rare that Comrade Chang Haonan serves as the chief engineer and chief designer at the same time, single-handedly taking charge of this model with high hopes.
This seems to be seen as some kind of signal released after the establishment of the Industrial and Construction Committee...
...
In these days when Chang Haonan is gradually investing in new projects.
Some of his previous arrangements are gradually being tightened...
Paris, France.
Dassault Aviation headquarters. Charles Edelsteiner was in his office, listening to his assistant report on the test flights of the Falcon 8Z prototype in the past month, as well as the test and promotion plans for the second half of the year.
Overall, it was very smooth.
Except for a few test subjects that require meteorological conditions, the rest are basically completed in one pass.
Even the most optimistic timetable before, no one dared to think of this kind of scenario.
So much so that this model may be put into commercial operation in late 2003 or early 2004.
To this end, the project team even plans to conduct ultra-long range tests for publicity purposes in advance.
Of course, as part of the test flight project, it is definitely impossible to directly touch the limit range in one step.
Therefore, the plan is to start with the 9,000-kilometer Paris-Los Angeles route and gradually increase the number to the final 12,000-kilometer Beijing-New York route.
"Wait..."
Hearing this, Ed Steiner suddenly interrupted:
“Can’t Paris be used as the center of the flight test? Just take off from Paris and go to different destinations...”
He I have always felt that the Chinese color in the Falcon Z project is a bit too strong.
But now that the matter has come to this, it is definitely impossible to get rid of the influence of China technically.
But we can try to improve the French color of Falcon 8Z at the commercial level.
At least the market must be aware that this is an aircraft belonging to Dassault.
However, the assistant shook his head:
“The mainstream routes of business jets are the few regional central cities in the world, and Paris is too close to these places... The west coast of the United States is less than 9,000 kilometers, and even Asia and South Africa are less than 10,000 kilometers away. Sydney is too far, at more than 16,000 kilometers..."
Modern commercial activities, even if the United States replaces the United Kingdom, After becoming the new world hegemon, it was still Europe-centered for a long time.
This unique location feature is usually treated as an advantage, but today, it was a little joke on Ed Steiner.
Just when he was about to say something more, a figure suddenly appeared at the door of the office.
Ed Steiner raised his head and noticed that the person coming was Didier Casore, the head of Dassault's aerodynamics department and the person in charge of the overall design of the Falcon Z project.
In the past half month or so, the other party has been in contact with the Ericsson team in Sweden according to his arrangements to verify the possibility of installing a complete "Ericeye" early warning system using the Falcon 8Z as a carrier aircraft.
Now that it suddenly appears here, there is a high probability that there will be results.
Considering that Falcon Z itself was almost a sure thing, Ed Steiner thought for a moment and temporarily stopped communicating with his assistant. Then he quickly stood up and invited Casore outside the door. .
"Didier, where are the Swedes..."
Ed Steiner asked anxiously before he even had time to sit back in his chair.
But before he finished speaking, he stopped abruptly.
Because, judging from the other party's expression, the result may not be optimistic.
Sure enough, Casore opened his briefcase, took out a thick report, and placed it in front of Ed Steiner:
"From the perspective of load weight alone, even the complete version of the Erieye system does not exceed 4.5 tons, and even the smaller Falcon 7Z can carry it."
"But Sweden has given The antenna design is not optimistic. The balance beam antenna designed by the active phased array itself is not small in size and weight. It is not a big problem for the lower speed Saab 340 and 2000, but it must be installed on our Falcon. On the 8Z, I'm afraid it will take a major overhaul of the wing stabilizer design and most of the body structure..."
"However, considering that the main wing airfoil of the aircraft was optimized by China , If I can get their support, I think it won’t take too long..."
Ed Steiner’s expression gradually became stiff.
Especially when you hear the last sentence——
As Casore said, if we can get support from China, this improvement may not take too long.
But the problem is that from the beginning, I wanted to find the Swedes to cooperate because I didn’t want to be controlled by the Chinese?
(End of this chapter)