Chapter 664

As Lin Guanghua said, Pakistan is really sincere this time.

It can be seen from the lineup of their delegation to China that lieutenant general Rahman, deputy chief of the general staff of the Pakistani army, personally led the team, including the main leaders of the general staff, heads of technical departments, leaders of various departments of the Pakistani air force, as well as several senior experts in the field of aviation in Pakistan.

There are more than 40 people.

In addition to the large number of people, Rahman and his party also have a lot of votes on hand. The amount of authorization granted by the Pakistani government has reached US $400 million. If necessary, they can also apply to the domestic government for emergency response, and the amount will be further increased to US $1 billion.

High standard, high level, lots of tickets.

It is appropriate to sum up the Pakistan military delegation in these nine words.

because of this, the reception level of the country is very high, after all, it is full of sincerity. It is called the customer is God, God comes to cut his hand, although not bright, bright, shouting a pro ~ ~, old fellow ~ ~ or old iron ~ ~ what, but similar sincerity still needs to be taken out, which means that how to cut your hand is worth.

In this respect, Lin Guanghua's words are not true, but it's not true to say that Lin Guanghua's words are all right. Rahman and his party are sincere enough to cut hands, but they are not from Tengfei group.

It is for the two cooperation projects with China in the late 1980s.

One is the intermediate trainer project cooperated with Hongtong aircraft factory in 1986.

The other is the light fighter project with successful airlines in the late 1980s.

Originally, these two foreign military cooperation projects have nothing to do with Tengfei group, which is not even a reserve aviation manufacturing enterprise.

So even if there are some successful airlines which are closely related to the Tengfei group and developed from the success factory, they have little to do with the Tengfei group on the whole.

After all, after years of development, the path of Tengfei group and successful Airlines is increasingly different.

Tengfei group takes the dual-use way of large platform.

Because of its military industry genes, and its participation in a number of J-7 modifications and No. 10 projects, successful aviation is more and more heading for the path of a professional military equipment manufacturer.

In this way, the two big factories, which are not far away from each other, not only have no fierce competition, but they are becoming more and more complementary.

Tengfei group's strong manufacturing capacity and professional aviation production equipment enable successful aviation to obtain world-class aviation production and processing technology in the first time.

The technology and accumulation of successful aviation in fighter can also make up for the lack of experience of Tengfei group caused by the problem of inside information.

In a word, the relationship between chengteng system has been deepening in recent years. If the two are regarded as a whole, its products cover almost all the industrial chains from the third generation fighters, the second generation light fighters, to small general aircraft, light transport aircraft, and even medium transport aircraft.

Not only that, in the fields of aerospace, missile, UAV and so on, they are also involved in a lot. It seems that they have become a comprehensive aerospace production base with the highest activity, the largest output value, the richest product categories and the highest innovation added value in China.

However, as the saying goes, Cheng Teng's family is in harmony, and their core businesses are quite different.

However, all this changed suddenly after the head of the headquarters inspected the turbofan engine production line of Tengfei aviation power under Tengfei group last time.

This is mainly because the power system of the intermediate trainer undertaken by Hongtong aircraft factory can not get the original American supply for some reasons, so that the trial production is seriously delayed.

When the head of the headquarters inspected the Tengfei aviation power plant, he not only looked at the production of the power system of the target 5 cruise missile, but also found out whether the Tengfei group could solve the power problem of the intermediate trainer.

It is not difficult for an aeroengine manufacturer that can provide 3.8 ton thrust turbofan engine for Yun 15plus to produce a 2 ton turbofan power.

What's more, take-off aviation power takes the route of core machine derivation. Over the years, the improvement of hx-4-1 core machine has not been interrupted. With the continuous application of new materials and new technologies, hx-4-1 core machine is becoming more and more mature, and the operation power of the latest improved model has been close to 3 MW.

Based on the mature and reliable core aircraft, Tengfei aviation power can not say that it can do whatever it wants in the aspect of aero-engine, but it can make a comprehensive understanding of the aircraft type.

Otherwise, it is impossible to produce wd-48sm turbofan engine with 3.8 tons thrust at one time.

We should know that wd-48sm turbofan engine is a typical turbofan engine with large bypass ratio, which is mainly used in military transport aircraft and regional airliner.

The thrust of the small bypass ratio version is 2.4 tons, while the thrust of the entry-level version of the preliminary test model is only 1.8 tons.

The three engines are the second-generation modifications of hx-4-1 core engine. The performance of the three engines depends on which one the customer needs. The engine can be produced directly according to the thrust requirements.The chief engineer of the intermediate trainer at Hongtong aircraft manufacturing plant, of course, wants a small bypass ratio version with 2.4 tons of thrust. In this way, the flight performance, clearance time and operation quality of the intermediate trainer will be improved.

But the problem is that the size of the intermediate trainer is too small, and the small bypass of 2.4 tons of thrust is a little larger than that of the version. There's no way. When Tengfei group developed this power, it didn't want to install combat aircraft at all. Everything was in accordance with the standard of light transport platform, so it was made a little stronger. If the intermediate trainer wanted to install it, it had to be pushed to the heavy end, which was too expensive It's too big.

However, we can only choose the entry-level version of 1.8 tons, wd-42s turbofan engine. The general index of wd-42s turbofan engine is similar to that of American tfe-731 turbofan engine selected before intermediate trainer.

Length 1556mm

width 852mm

total weight 406kg

bypass ratio 2.9

thrust weight ratio 4.98

turbine inlet temperature 1020 ℃

maximum take-off thrust 1886kg

cruise thrust 452kg

overhaul time 1800 hours, total life 7600 hours.

As far as the performance is concerned, although it can't catch up with the latest model of tfe-731 series turbofan engine made in the United States, it is not bad compared with its previous model, but slightly surpasses in some indexes.

For example, the tfe-731-2a engine, which was prepared to be used by the intermediate trainer before, has a turbine inlet temperature of 956 ℃ under the condition of basically the same size. As a result, its maximum thrust is only 1601kg.

Because of this, although the chief engineer of the intermediate trainer didn't use the small bypass ratio version of 2.4 tons of thrust, he was very satisfied with the wd-42s turbofan engine as a whole. No matter how much thrust was increased, the weight didn't increase much. Once the intermediate trainer was adopted, not to mention the qualitative leap in performance, the improvement of flight quality was guaranteed .

With the mid-level trainer of Hongtong aircraft factory, the successful aviation's light fighter project began to itch.

Intermediate trainer is the last resort in terms of power, while the light fighter project has no power at all. So I heard that Tengfei group started to develop the next generation of 6 MW core aircraft and was ready to launch the 6-ton medium turbofan power. It was like an old virgin who had been holding on for decades. Finally, he met the goddess who had been waiting for him for a long time and rushed forward with a cry!