Chapter 81 Turbojet 14 (Additional update for the magic luppp002 flying by the helmsman) (two-in-one)
Due to major changes in the design of the No. 04 and No. 05 verification machines, the No. 04 machine The day after the first flight was completed, Yang Fenghata quickly chaired a work coordination meeting between different factories involved in the 83rd Project to determine the current technical status of the 83rd Project.
Different from the previous progress seminars that were just within the 601 Institute, this meeting was of a higher level and covered more and wider fields, with several times the number of participants.
In general, the improvement work related to the wings is progressing very smoothly.
While Chang Haonan was designing the slats, the wing structure research team successfully arranged the relevant pipelines and hydraulic mechanisms for the leading edge slats at the expense of reducing the volume of the wing fuel tank by about 5%. In the main wing structure, this saves the most time for the entire improvement project.
Lin Shikuan's digital design team also connected with Factory 112 and successfully introduced digital manufacturing technology into the improvement and production process of the new wings of the 04 and 05 prototypes.
This allows Factory 112 to start production preparations for the new wing almost simultaneously with the wind tunnel test after obtaining complete design data.
In the few days of wind tunnel testing, the flight control design team calculated the aircraft control rate under the condition of slats as quickly as possible, and made corresponding modifications to the previous flight control system .
They have accumulated considerable experience in the design of analog and digital fly-by-wire flight control in the past J-8ACT and the J-8IIACT active control technology demonstrator aircraft that will soon make its first flight. The ability in this area is quite reliable.
It is precisely because of all the above reasons that the No. 04 prototype was able to complete improvements and make its first flight again in such a short period of time, and the production of key components of the No. 05 prototype has also begun.
The new overall arc windshield led by Yao Mengna has also completed the structural design and installed the first sample on the No. 04 prototype. She is assisting Factory 112 in designing a new molding and clamping system control software to ensure Improve the quality of molded parts and reduce the scrap rate.
However, if it was all good news like this, then Yang Fenghata would not actually need to hold this meeting.
The problem still lies in Feifa’s matching work.
After the inlet professional team and the 606 office responsible for the WP14 engine have worked together, they still have not been able to find out the root cause of the engine's possible smoke inhalation and shutdown after the missile on the inner pylon was launched.
Objectively speaking, the working conditions of the engine when the PL8 or PL11 missile is launched are indeed very poor——
When the 612 Air-to-Air Missile Research Institute in Luoyang developed the Pili 8 air-to-air missile, there was no smokeless propellant that met the performance standards in China, so the pyrotechnic effect of this missile when launched was very spectacular.
Coupled with the inherently unstable WP14 engine...
This is a problem caused by the weak aviation industry system.
China is not the only one in the world using smoke or micro-smoke propellants. In fact, as long as the aircraft and engine are properly designed, a small amount of primary smoke composed of carbon particles and metal oxides will not cause any damage to launchers. The platform makes an impact.
For a powerful country in the aviation industry, even if a certain link in the equipment system is not perfect, it can often be made up for by leaving margins in other aspects.
But for China in the late 1990s, every link in the equipment system was not perfect, and it was not easy to meet its own design targets. Therefore, once something went wrong, it was difficult to count on other parts to help fix it.
When the topic came here, the warm atmosphere at the beginning gradually turned serious.
Fortunately, although China's aviation industry system lacks capabilities, it at least has unified leadership, and there is no phenomenon of mutual criticism between different systems.
At this time, Institute 601, Institute 606 and Institute 612 are a whole, and it is useless to blame others. The key is to find ways to solve the problem.
“Since it is currently impossible to determine where the specific problem is with the engine, we might as well change our thinking.”
Finally, a comrade from the overall design team put forward his own idea:
“The detachment method of the missile on the innermost pylon can be changed from the slide rail type to the ejection type or the drop type, which can reduce the number of The smoke concentration that the engine faces will reduce the failure rate.”
Chang Haonan, who was sitting in the first row of the conference table, wrote this question in his notebook and frowned slightly as he thought about it.
This comrade’s idea is certainly feasible.
The missile needs to be tightly connected to the aircraft through the guide frame and pylon.
The so-called slide launch means that the missile is ignited directly on the launcher and relies on its own thrust to slide along the track and leave the launcher.
As for ejection and drop-type launches, the missile first leaves the launcher through the ejection mechanism or its own gravity, and then ignites in mid-air.
Since the missile is already at a certain distance from the carrier aircraft when it is ignited, the impact on the latter will naturally be much smaller.
In fact, these two methods first appeared to launch heavy air-to-ground missiles that were relatively noisy when ignited.
There is no problem in dealing with the similarly noisy Thunderbolt 8, as well as the future Aspad or Thunderbolt 11/12.
But everything has a price.
These two methods have strict requirements for overload during launch, and as a weapon used in close combat, the Thunderbolt 8 often needs to be launched under conditions of large overload.
So if this method is really adopted, it basically means that the inner pylon can only carry medium-range air-to-air ammunition or auxiliary fuel tanks.
More importantly, Chang Haonan doesn't like to avoid questions like this.
Although the smoke concentration when the Thunderbolt 8 is launched is very high, it can be launched normally on the previous J-7E and J-8B.
The R27 medium-range air-to-air bomb, which also does not use smokeless propellant and is more noisy when launched, can even be launched directly under the Su-27's inlet.
So no matter what, WP14 must have flaws.
Even if the immediate problem is solved by changing the launch method, the two unstable engines are still a hidden danger.
It must be changed!
The truth of this matter is not complicated. Chang Haonan can see it, and other people participating in the work coordination meeting can naturally see it too.
Moreover, changing the missile detachment method actually does not require any changes to the aircraft itself, just changing the guide frame, and it does not even require the participation of any unit in the 83rd Project.
So this suggestion was ultimately chosen as a covert alternative.
On the other hand, due to the major changes in the wing design, Project 83 has an additional prototype. It is expected that the number of test flights will be more than originally planned. The 606 Institute and the inlet professional team have also There is an opportunity to troubleshoot the cause of the problem.
Of course, the safest way is to give up the turbojet 14 and go back to the slightly inferior but proven turbojet 13F2.
But not only 606 Institute, but also other people involved in the 83rd Project were unwilling to do this.
The reason why China's aviation engine development has been bumpy is that, in addition to its weak foundation and the high difficulty of aviation engines becoming the crown jewel of the industry, another important reason is that our aviation engines have always been used as corresponding aircraft. The project exists in conjunction with it.
This is not only true for imitations, but also for self-developed models.
If the aircraft project is discontinued, the corresponding aviation development projects will also be discontinued.
This results in almost no back-and-forth between different types of aviation engines, and each project is started from scratch for scientific research institutes.
In fact, not to mention every project, a project with the same code name may be overturned multiple times at different stages due to completely different performance and technical requirements. This lesson is particularly unforgettable for Institute 606.
In 1963, in order to improve the H-5 bombers that were heavily equipped at that time, the 606th Research Institute, under the leadership of Wu Daguan, developed the No. 950 engine based on the turbojet 6, which was later named the turbofan 5. Compared with the original H-5 bomber, 5 uses a 35% increase in the turbojet 5A engine and reduces fuel consumption by 30%.
In 1970, Turbofan 5 completed ground testing and its performance in all aspects fully met the requirements. Although there was still a gap compared with the world's advanced level, it was a successful first step.
However, in 1973, as the Air Force gave up its plan to continue improving the H-5, the already highly completed turbofan 5 project was also discontinued.
The Turbofan 6, which was initiated slightly later than the Turbofan 5, also had a bumpy journey. It went through four launches, four shutdowns, five changes in design goals and transfers of design locations, and finally came to nothing with the J-9 project. .
The turbojet 14 "Kunlun" supporting the August 3rd Project is the first Chinese aircraft engine to have completed its own design, trial production, testing, and successful installation and flight test. It is also the first aircraft engine with completely independent intellectual property rights. .
Although the performance of this engine is average in all aspects, everyone has feelings for such a "lone seedling" of aerospace power system.
If we choose to use the old model at this juncture, even if it is only temporary, it will definitely have an adverse impact on the Turbojet 14, which has finally made it to the test flight process.
So at the end of the meeting, Yang Fenghao decided to let the inlet professional team and representatives from the 606 Institute go to Yan Liang first to look for ideas to solve the problem. The 03 prototype that had just moved over The aircraft and the 01 prototype that have passed before are undergoing frequent test flights there and can provide more data.
Other groups are cooperating with Factory 112 to complete the production of 05 prototypes as quickly as possible.
...
Throughout the second half of the meeting, Chang Haonan was thinking about his next plan.
He returned to Shengjing early this time just to verify the design of the turbojet 14 engine, especially the compressor structure.
If we want to continue to promote the progress of the 83rd Project, the engine must be an unavoidable part.
Moreover, if the progress of the Turbojet 14 can be straightened out, it will be a good start for China's aerospace industry.
No matter what you do, you need positive motivation.
Just like when you are studying, if there is a progress bar, if you can increase your score by a few tenths of a percent after reading a book and doing questions, then the number of good students will probably be much greater.
So first use the fastest speed to create a usable finished product. Even if the performance is not bright, it will produce good feedback.
This hard nut must be chewed off!
So after the meeting, Chang Haonan directly found Yang Fenghao.
The latter was discussing something with a solemn-looking middle-aged man.
"Hey, Xiao Chang."
Yang Fenghao noticed Chang Haonan walking towards him, then patted the other person opposite him and introduced:
"Here, Lao Yan, this is the Xiao Chang I told you just now, Chang Haonan."
After the man heard Chang Haonan's name, he immediately turned his head and looked him up and down. ：
"Comrade Xiao Chang, I heard Mr. Yang say before that the technical improvement of the 83rd Project was directed by a young man in his early twenties. Today I finally saw him in person!"
The other party took the initiative to shake hands with Chang Haonan, but the expression on his face was still very ugly.
At this time, Yang Fenghao spoke to Chang Haonan again:
“This is the leader of our Eighty-three Project Power Joint Research Team and the chief designer of the turbojet 14 engine. Yan Zhongcheng.”
Chang Haonan suddenly realized.
Judging from the current progress of the August 3rd Project, Yan Zhongcheng, as the general person in charge of the power system, is indeed facing a lot of pressure.
"Hello Yan Gong, I have admired your name for a long time."
Of course Chang Haonan had heard of Yan Zhongcheng's name before his rebirth.
Although the turbojet 14 developed by him was not successful in the original timeline, the QD128 gas turbine for power generation developed on the basis of it successfully entered the market stage and was even successfully exported. It can be regarded as another milestone in the development of the industry. One area has been successfully cultivated.
After the three exchanged a few words, Yang Fenghao changed the topic and said to Chang Haonan:
"I remember when we first met at Beijing Airlines, you mentioned that the theoretical principles of fluid mechanics and engineering methods of computational simulation are universal, and you are also conducting research in related fields of compressor blade design and manufacturing."
"So Lao Yan and I were talking just now about transferring you to the Power Joint Research Team to do some work with the 606 Institute. What do you think?"
What's your opinion?
Of course there is no objection.
It would be better to say that Chang Haonan was still thinking about how to open this conversation with Yang Fenghao just now, but now he no longer has to worry about it.
Therefore, he agreed to the arrangement almost without thinking, and his decisiveness surprised Yan Zhongcheng next to him.
The latter looked at Chang Haonan again, who was standing upright in front of him, and said in a solemn tone:
"Xiao Chang, before making a decision, I still have to give you a call. Precautionary shot."
"The Turbojet 14 is our country's first complete attempt to develop an aero-engine model from scratch. The foundation in this area is weaker and more difficult than the fields you have been engaged in before. More, and... you may also face life danger, so I hope your decision is carefully considered.”
In fact, Yan Zhongcheng himself almost died in an engine test accident, so this life risk is definitely. Not to scare people.
"Let's see. The power joint research team is expected to decide on the candidate to go to Yanliang the day after tomorrow. You can give me the final answer at that time."
Chang Haonan originally wanted to express his position directly, but he looked at the other party's In the end, he didn't speak, but just nodded.
Yan Zhongcheng was obviously worried that he would make impulsive choices and underestimate the difficulties he would face, which would lead to some emotions appearing at that time.
This situation can be said to be not uncommon.
Instead of wasting words and explanations, it is better to wait for two days so that the other party can feel at ease.
"Okay, I will think about it."
The first order should have exceeded 2,500, and we will continue to do so tomorrow
(This chapter End)