Chapter 537 JH-7A, heavier, farther and safer
Although it is the first time for Tang Changhong to serve as chief designer, he has also served in both the basic JH-7 and MA-60 projects. He is a subsystem designer responsible for important research and development content, so his prestige within Institute 603 is not a problem.
Now that he has said this, the others below naturally no longer have any worries and start thinking about how to adjust the aircraft parameters so as to better adapt to the combat ideas of the new era and not waste the two machines with huge performance improvements. engine.
Seeing that everyone had unified their thoughts, Tang Changhong continued to add:
“This time, the users of JH-7 have expanded from the pure navy to the navy and air force, and the latter also asked us A project fund was provided and the aircraft was required to have the ability to conduct ultra-low-altitude penetration and use precision-guided weapons.”
"Users have put forward new requirements, so we also need to make some targeted upgrades to the functions of the aircraft."
After a brief silence, a young engineer responsible for assisting Tang Changhong in the overall scheme design first opened the door Mouth:
“Since the performance of the new engine is so much better than that of Spey, the wing area and strength can be slightly expanded. The old model JH-7 can only carry two YJ-81 anti-aircraft missiles. Ship-to-ship missiles, this efficiency is too low.”
“The navy faces fewer targets, so the problem may not be too big, but the air force may have to attack multiple targets at one time, and the low bomb carrying capacity will definitely reduce combat operations. Efficiency. ”
Conducting technical seminars is actually similar to holding group meetings for graduate students.
Once the first person speaks, the rest will become more natural.
Another old designer with gray hair on his temples who looked much older than Tang Changhong continued on the topic of the wings:
"Mr. Chen designed the aircraft back then. At that time, in order to reduce the risk of research and development, we chose a more conservative airfoil, which resulted in the overall flight performance being average.”
“When I went to the 601 Institute on a business trip last year, I saw some J-8C wing designs. I think you can refer to the information.”
When he said this, someone immediately expressed doubts:
"J-8C...isn't that an interceptor? It's also a delta wing. It doesn't match our aircraft at all, right?"
"Learning ideas, but not copying them."
Old designer He stretched out his fingers and tapped the table in front of him, as if to emphasize what he was going to say next:
"The finalized J-8C adopts an integrated leading edge slat, main wing and trailing edge flap. The design idea can avoid the simultaneous occurrence of mixed boundary layer and flow separation when the flaps are deflected at the same time. Although it is a large delta-wing interceptor, its low-altitude lift and maneuverability are very good.”
"Every interceptor aircraft has taken full consideration of low-altitude performance. If our fighter-bomber failed in this aspect, it would be a big shame..."
"Besides..."
At this point, he paused slightly, as if he was hesitating whether to continue.
But in the end, he lowered his voice and continued:
"In addition, I also heard from people over there at the 601 Institute that the leading edge slat structure of the J-8C was developed by Mr. Xiao Chang. After joining Project 83, it was the first change that was completed!"
People are interested in this kind of gossip content.
"Mr. Chang? It's..."
"Who else could it be? It must be Mr. Chang Haonan. If you calculate the time, it should be right..."
Obviously, Chang Haonan This name is somewhat legendary in today's aviation industry system.
"Hey... if that's the case, you can really consider sending someone to study."
Someone immediately made it clear:
"When Mr. Chang was here to revamp the JH-7, I was fortunate to work under him. According to Mr. Chang's work style, when designing things, he will definitely leave behind a whole set of methodologies. Let's learn from them. You can definitely get twice the result with half the effort.”
“The candidate sent to study...”
“…”
Seeing that the topic was a little off track, he was responsible for the design of airborne weapon systems. Yang Lin, a senior engineer at the company, tapped the document paper in front of him with the cap of his pen:
“Speaking of ultra-low-altitude penetration.”
"The Air Force's ultra-low-altitude penetration is different from that of the Navy. The environment is much harsher. Our country currently does not have low-altitude comprehensive navigation equipment like the US military's AN/AAQ-13, or even targets like PRNK-23K that can adapt to low-altitude environments. The identification and tracking systems lack existing models..." "As a result, whether it is flying or attacking, we are under great pressure..."
"On the bright side I think the JH-7 has two pilots, who can be responsible for flight and attack respectively, so the pressure is not as great as that of the pilots of the MiG-27 or F16C."
Gong Xinmao, the deputy chief designer in charge of flight control system design, is next to him. He answered, which was barely comforting.
Then he expressed his thoughts again:
"Can we consider using the search radar on the nose of the aircraft to track the terrain, combined with the sled method or the adaptation angle method to achieve terrain matching tracking?"
"The performance of the 232H fire control radar on the old model JH-7 is definitely not enough, but The 1473 currently developed for the third-generation aircraft, or the 1472 radar used on the J-8C should be able to meet the requirements. Anyway, the radar is not needed to search for targets during ultra-low-altitude penetration. "
As a flight control design. Master, this is obviously the most direct way he can think of.
Although the original design of the 147x series radar is for anti-aircraft use, it is not difficult to add a youth version of the terrain tracking function to it.
After all, it is just a requirement to avoid collisions, and it does not say that the terrain must be completely mapped.
However, Yang Lin, who has dealt with weapon systems more often, immediately denied this idea:
“It is possible to fly this way, but low-altitude penetration is originally about concealment. At this time, the nose of the aircraft is opened with great fanfare. Radar... I’m afraid it’s not suitable?”
“The emission angle of the nose search radar is too large. If there is another aircraft in the sky, wouldn’t everything be exposed when the radar warning receiver goes off? "
"Is there a better way? It is definitely not possible to integrate terrain tracking radar into a pod. Moreover, since users require the use of precision-guided weapons, they also need to consider Carrying the laser guidance pod and the data transmission pod for air-to-surface missiles, it is unlikely that there will be room for the third pod."
"..."
Seeing that the atmosphere at the scene was a little too lively, Tang Changhong quickly calmed down the scene:
"Comrade Xinmao was right just now. After all, the JH-7A has two pilots, and the pressure during normal flight at ultra-low altitude is relatively less. Therefore, compared to automated low-altitude navigation pods, we still have to pay attention to the most basic flight safety issues first."
"According to feedback from basic JH-7 pilots, what they are most worried about is, In fact, a sudden power failure occurred during low-altitude flight. "
"In terms of flight safety, I remember that the Chengdu 611 Institute used a type of air intake during the testing of the No. 10 prototype. The technology of predicting engine surge in advance will limit the aircraft's continued violent maneuvers to avoid the risk of surge."
"Comrade Xinmao"
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Tang Changhong looked at his deputy chief designer next to him:
"I have contacted Chief Engineer Song Wencong and Chief Engineer Yang Wei of the 611 Institute. They agreed that we would send a team of technical personnel to inspect and study. I am ready to let You come and lead the team and stay in Chengdu for a while.”
Although various places under the aviation industry system have been transformed into groups with branch offices, there is also some competition between them, but he said. In the end, it is still a game of chess for the whole country.
With such important technology, it is impossible to hide it and only use it for yourself.
Gong Xinmao was stunned when his name was suddenly called.
This technology sounds too good to be true.
Especially for fighter-bombers that mainly fly at medium and low altitudes, once surge occurs, they often do not have as much response time as fighter jets.
Coupled with the relatively ordinary ejection escape system of the JH-7, it can easily lead to a first-class accident in which the aircraft crashes and people are killed.
If surge can be detected and suppressed in advance, or even just delayed, it will be of great help to flight safety.
So he immediately stood up and solemnly expressed his position:
"Yes! I will definitely learn this technology and bring it back!"
(End of this chapter)