Chapter 827

After breaking through the key technologies, the rest will come naturally.

The d-50 turbine gas power plant is ready-made. With the technological breakthroughs made by Tengfei group in recent years, wd-52ml turbofan engine came into being.

The whole engine is a dual rotor turbofan structure, with a diameter of 1260 mm, a length of 2861 mm, and a net weight of 872 kg.

the fan is a one-stage axial-flow fan. The blades and discs are made of titanium alloy, of which the number of blades is 28. The forged solid blades with wide chord and no boss accumulated by Tengfei group for many years are used, and the maximum speed is 7360 rpm. The unique connecting mechanism is adopted to make the engine stable The replacement of the fan is very convenient, and the fan blades that need to be replaced can be handled directly without removing the engine.

The compressor adopts a 10 stage high-pressure compressor structure, in which the first three stages adopt the mature integral bladed disk structure of Tengfei group. The blades are made of titanium alloy, and the unique linear friction welding of Tengfei group is used to fix the blades on the high-pressure compressor bladed disk, so as to realize the technical index of integral bladed disk.

The remaining 7-Stage blades are made of nickel alloy steel with traditional detachable structure, which can be replaced separately. This configuration is because the dual rotor engine structure is conducive to improving efficiency, and the second is to reduce the production cost. There is no way to improve the overall compressor, but the materials and technology are too expensive. If all the compressors are used, it is not cost-effective.

For this reason, the combustion chamber is made of nickel alloy steel sections, which are processed by complex machining. This alone can not meet the ultra-high temperature burning in the combustion chamber. Therefore, Tengfei group has added a layer of high temperature resistant ceramic coating inside the combustion chamber, so that the fuel can be fully burned, so as to reduce pollution, increase fuel efficiency and improve economy Sex.

However, in order to achieve this goal, a flame tube is needed. The flame tube of wd-52ml turbofan engine adopts a central low-pressure fuel injection system with 18 flame nozzles, which can easily ignite and fully burn the fuel.

In addition, the maintainability of the flame tube is also very good. It can be easily disassembled. Besides, it can also be inspected by using the hole detection equipment of Tengfei group.

Of course, the fan, the air compressor and the combustion chamber are strong, and it is useless if the turbine is well matched. The turbine of wd-52ml turbofan engine adopts high and low turbine structure.

The high pressure turbine has two stages and the low pressure turbine has four stages.

All of the six turbine discs are manufactured by Powder Superalloy technology. The high pressure turbine blades are made of nickel alloy single crystal cast hollow blades based on Powder Superalloy technology, and the gas film cooling technology and high temperature resistant ceramic coating technology are adopted.

Combined with all these advanced technologies, the temperature in front of the turbine is raised to 1360 ℃, which makes the performance of wd-52ml turbofan engine get a qualitative leap.

In the first two stages of low pressure turbine, high temperature ceramic coating is applied to the nickel alloy single crystal blades with Powder Superalloy technology, but film cooling is not used; in the last two stages, ordinary nickel base alloy is used.

At the same time, it can reduce the cost and ensure the reliability of the engine.

After such integration, the maximum thrust of wd-52ml turbofan engine reaches 5.2 tons, and the thrust weight ratio is close to 6, which is 5.96.

It is no exaggeration to say that it is a master of aeroengine in Tengfei group for more than ten years.

Its significance is not only to show the strong aero-engine technology R & D ability of Tengfei group, but also to show that the wd-52ml turbofan engine will become the foundation of the aero-engine field of Tengfei group in the next ten years.

Because the core engine derived from the compressor, combustion chamber and high-pressure turbine in wd-52ml turbofan engine fully meets the initial requirements of the second generation core engine of Tengfei group. With a little improvement and perfection, it can become the main core engine of many future aero-engine models of Tengfei group.

Even if we don't talk about the important role of the core engine in the future, as far as the wd-52ml turbofan engine itself is concerned, its importance to Tengfei group is also self-evident.

With the success of wd-52ml turbofan engine, Tengfei group's haidongqing plan will continue to advance. At that time, the 50 seat and 70 seat regional airliner will not only land smoothly, not to mention, the super luxury long-distance business aircraft will also be launched without hindrance.

In addition to regional airliners, the impact on the trainer of Tengfei group is also huge.

You should know that wd-52ml turbofan engine can be easily changed into a small bypass ratio turbofan engine. Tengfei group has done a test in this respect. The normal thrust of the small bypass ratio version of wd-52ml turbofan engine will drop to 4.8 tons, but an afterburner is added, and the thrust of the engine will reach 7.6 tons when the afterburner is turned on.

This index has exceeded the turbojet-13 engine currently used by J-7 max.

A turbofan engine superior to the turbojet-13 is not only a solution to the problem of the J-7 max of Tengfei group, but also a subversive existence for the whole country. You should know that there are many domestic aircraft equipped with the turbojet-13 and the previous generation of turbojet-7 engines, needless to say, the J-7. At present, the J-8 II, the main force of domestic air combat, uses the turbojet-13 engines Motivation.A few years ago, it was like replacing the turbojet-14 with a higher thrust engine. However, the reliability of the engine was not high, and it was easy for the engine to spray parts in the sky, but it had to replace the turbojet-13.

Now, a small bypass ratio version of wd-52ml turbofan engine is available, which is superior to turbojet-13.

The reason why we didn't immediately launch the replacement turbojet-13 and occupy the domestic military aircraft aero-engine market is mainly due to the size problem. After all, the diameter of wd-52ml turbofan engine with large bypass ratio is only about 1.2m, and the diameter of small bypass ratio is less than 0.8m.

The engine cabins of J-7 and J-8 have long been given a diameter of about one meter by vortex jet 7 or 13.

It is obviously unrealistic for the J-7 and J-8 to adapt to the wd-52ml turbofan engine, which is equivalent to rebuilding two types of aircraft. Only the wd-52ml turbofan engine can adapt to the domestic combat aircraft in active service.

Therefore, it is necessary to increase the size of the engine. All the indexes of the aero-engine can lead the whole body. It seems simple to increase the size, but in the aero-engine, it means the increase of the air intake, the increase of the compression ratio, the more violent combustion and the further increase of the temperature in front of the turbine.

The result is further performance improvement.

For this reason, Tengfei group has calculated that, without any other adjustment, based on the core components of wd-52ml turbofan engine, a small bypass ratio turbofan aero-engine with 1050mm diameter, 5684mm length and 1.2t net weight is derived. The normal thrust will be increased to 5.6t, the afterburner thrust will be 8.7t and the thrust weight will be 7.

This value can be compared with the rd-33 turbofan engine of the Soviet Union and the f-404 engine of the United States. It is only a little worse than the f-414 engine to be developed in the United States. The problem is that GM can develop the f-414 on the basis of the f-404. Why can't Tengfei group continue to advance on the basis of the wd-52ml turbofan engine?