Super military empire

The moment he saw Qi Hai, Liu Yijiu didn't even recognize it.

Qi Hai now has deep sunken eye sockets and bloodshot eyes, his originally round face is pale, and the whole person is so thin.

Rao was angry in his heart, and when he saw Qi Hai like this, he couldn't help but feel pain. Could it be that Qi Hai is ill?

"Dr. Liu, President Qi is not ill. It is mainly caused by working day and night and tremendous pressure. Since our team was under the jurisdiction of the Ninth Hospital, President Qi’s daily rest time is less than five hours, even on holidays. No rest..." A middle-aged staff member explained to Liu Yijiu.

"It's okay, Director Liu, when the aerial platform test is completed, I will be able to rest well!" Qi Hai said to Liu Yijiu in a hoarse voice.

The softest part of Liu Yijiu's heart felt like someone stabbed him with a sharp knife, and his heart ached.

Now he can't say anything to blame, even if Qi Hai doesn't have any explanation, he can understand it.

Just like the old Ma Fengshan horses in history, when the Yun-10 test flight was progressing smoothly, the Yun-10 project was dismantled sadly, finally leaving the top Chinese designer of large airplanes to the end in depression.Liu Yijiu didn't want such a problem again, but he never thought that someone in the unit he managed would be overworked and lose his life.

In the current situation, everything seemed pale, and immediately asked, "How is the current situation?"

"The turbofan eight engine was tested on the test bench in the northwest, and the effect was very good. However, when the test was carried out on the aerial platform at the beginning, various problems emerged in an endless stream, such as the rupture of the high-pressure air pressure plate, the phenomenon of surge, and the abnormal noise in the air. Engine stop and so on..." Speaking of progress, Qi Hai frowned deeply.

His face is full of loneliness, helpless.

Liu Yijiu's heart grew deeper and deeper.

If the engine problem is not solved, even if the first flight of the f14 is successful, it will not make much sense.

After the disintegration of the Soviet Union, the Republic was able to purchase engines from Ukraine or Lao Maozi. Now there is no way to purchase high-thrust military engines.

It is impossible for the Americans to sell these advanced engines to China, nor will the British.

The French have problems with their own engines!

If the engine problem is not solved, the Republic’s advanced fighters will only be the two f14s obtained from Iran!

"Have these problems been solved?" Since Qi Hai was talking about these problems, Liu Yijiu asked as he walked into the airport, "There should be some problems that have not been solved yet? Design problems or manufacturing problems?"

If these problems are solved, it will naturally not cause Qi Hai, the chief designer of the engine, to have such a headache.

"Most of the problems have been solved. At present, our turbine discs are not strong enough. Especially in a long-term high temperature environment, it is easy to crack due to the increase in temperature... After all, our engine has a vortex front temperature of 1800k. It's rare in the entire international community..." Qi Hai said here is speechless.

"Since there is no solution, why did we start the test on the aerial platform? If the plane fell, it would be difficult for us to find a suitable aerial test platform." Liu Yijiu didn't use the questioning tone like in other places. .

The voice was very gentle, but you could tell from his words that he was trying to suppress his dissatisfaction.

"The production process problem cannot be solved. As long as the afterburner is not used, the problem is not big, and the performance on the ground test bench is the same. Without the afterburner, it can be used for a long time without problems. The longest continuous operation for 6,000 hours is no problem. The slightest problem, so under the current circumstances, we have to consider conducting aerial tests first to further study the various performance of the engine..." Qi Hai’s words, like a sharp knife, pierced Liu deeply. One nine's heart.

The manufacturing process is not good enough, and letting them do anything is in vain.

"How big of a press does our turbine discs use for forging?" Liu Yijiu suddenly thought of this question.

Only the Shanghai stock market in China has a 45,000-ton hydraulic press. In the 132 factory, there is only a 10,000-ton hydraulic press. This forging equipment can be used to produce the J-7 and other engines. There is no problem. After all, the J-7 is even the J-8. All of the engines do not use the technology of an integral turbine disc.

If a 10,000-ton hydraulic press is used to forge the integral turbine disc, this is somewhat inappropriate and the strength structure is different.

After coming here, Zhao Liangbi heard Liu Yijiu's words and quickly replied, saying that this thing was forged by a 10,000-ton hydraulic press, and then processed the fan blades through the machining center of the Ninth Institute.

"The new turbine disk, get it to the Shanghai Heavy Machinery Factory. Didn’t they get a 45,000-ton large press? It really doesn’t work. They get it to the Southwest Aluminum Processing Factory in Shancheng. They have a three A free forging hydraulic press of 10,000 tons..." Liu Yijiu sighed again.

The big domestic press is very different from the international one.

Fortunately, Erzhong has now begun to challenge the 60,000-ton press. The funding comes from the Ninth Institute.

However, in a short period of time, a large press of 60,000 tons is difficult to form.

After all, unlike anything else in the aviation industry, the requirements for pressure equipment are too high.The forging of large parts, especially those heavy parts that require very high strength structure, must be forged by a large hydraulic press.

Turbofan X has been unable to make breakthrough progress, but also because of the problem of the large press.

As soon as the dual 80,000-ton press came out, many problems that plagued China's aviation industry were quickly resolved.

Cracking occurs in the high temperature and high pressure environment, obviously because the strength of the parts is not enough.

Liu Yijiu followed along, thinking about these things.

How to solve these problems, how to solve these problems faster, this is not something he can change alone, he must concentrate all his efforts.

Phoenix Mountain Airport, as the largest military airport of the Chengdu Air Force, naturally has the largest number of military aircraft.

Because it is daytime, pilots need to be trained. Except for the maintenance and repair of the aircraft, the others are towed out and parked in the apron. Hundreds of F-7s and Strong Fives are neatly arranged. On the runway in the distance, from time to time The plane roared and took off.

"Due to the engine parking problem a few days ago, improvements are being made now. In order to keep it secret, the f14 used for the experimental engine is parked in the hangar..." Seeing Liu Yijiu constantly looking around the surrounding environment, Geng Liguo knew He is not looking for anything else.

Liu Yijiu nodded, and took the lead to speed up and walk towards the f14 hangar for the experiment.

When he entered the hangar and saw that the painting became colorful, the corners of his mouth twitched.

"In order to ensure the smooth progress of our imitation project, the overall load-bearing structure of this aircraft, such as the girders and keel, is the original f14, and the other systems are produced by ourselves..." Zhu Houdao looked at Liu Yijiu, who was dumbfounded. Explained.

The f14 fighter in front of us, except for the external aerodynamic layout, has not changed. No, it can't be said that it has not changed. These guys actually sadly added a small canard to the front of the variable main wing!

Completely changed the aerodynamic layout of this thing!

"No, I said what happened to the duck wing in front of this? When did the duck wing appear on f14?" Liu Yijiu asked the kind of explanation in surprise.

"In order to make the fighter take off faster and increase the rate of climb, after our experiments, we found that if there is a canard layout on the fighter, it can increase the lift during takeoff..." Zhu Houdao was a little embarrassed. To say.

Liu Yijiu felt that he was going crazy.

Although the f14 has many shortcomings, no one has ever thought of adding front canards to the aerodynamic layout of the f14.

"The results of the previous flight tests are still very good..." Zhu Houdao quickly added, fearing that Liu Yijiu might have an opinion on this."Although a canard-type aircraft has no advantages in normal flight conditions, when the aircraft needs to perform high-intensity maneuvers, such as upward pitching, small radius hovering, etc., strong vortices will be generated on the front and main wings of the aircraft. The mutual coupling and enhancement between the vortex currents produce stronger lift than the conventional layout; in the state of high angle of attack, the canard only needs to reduce the lift to produce the bow moment (called the unloading control surface), thereby effectively ensuring the large The controllability of suppressing excessive head-up at the angle of attack."

This proves that there is nothing wrong with their improvement.

Seeing that Liu Yijiu was not angry, Zhu Houdao continued to explain, "Moreover, our canards can be adjusted. Under normal flight conditions, they can be retracted into the aircraft and come out when needed... "

After the explanation, Zhu Houdao quickly let the person on the side operate it to Liu Yijiu.

Canard wing layout, coupled with variable swept wings, this thing may be called double swept wings?

Liu Yijiu felt that he somewhat understood why all fighters in the Republic had a canard layout.

This is the obsession of the staff of Republic Airlines, not because of domestic aerodynamic layout technology!

"Have you ever thought about changing the vertical wings to be movable?" In Liu Yijiu's mind, tens of thousands of fighter planes roared past. He felt that these aircraft design engineers were crazy!

"Director Liu, it’s not that we haven’t thought about it, but if we want to make such an improvement, the amount of engineering is a bit large. Once we have completed the test, we may consider such an improvement in the next step. As long as we change the shape, aerodynamic layout, Knowing that this thing is actually their f14, I also guarantee that there will be no fart..." Director Liu seems to have no opinion on this change, Zhu Hodao is very excited.

"Moreover, the chiefs of the Air Force are very satisfied with this design..."