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Break through the key technology, and the rest will be a matter of course.

The D-50 turbine gas power plant is readily available. In line with the technological breakthroughs made by Ascendas Group in the field of aeroengines over the years, the WD-52ML turbofan engine came into being.

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

The fan is a 1-stage axial flow type, the blades and discs are made of titanium alloy, the number of blades is 28, and the forged wide-chord, non-convex solid structure blades accumulated by Ascendas Group for many years are used, and the maximum speed is 7360 revolutions. Minutes, the use of a unique connection mechanism makes the replacement of the fan very convenient, and the fan blades that need to be replaced can be directly processed without disassembling the engine.

The compressor adopts a 10-stage high-pressure compressor structure, of which the first three stages use the mature integrated blisk structure of Ascendas Group, the blades are made of titanium alloy, and the unique linear friction welding of Ascendas Group is adopted to fix the blades on the blisk of the high-pressure compressor. , So as to achieve the technical indicators of the overall blisk.

The remaining 7-stage blades are made of nickel alloy steel, using a traditional detachable structure, and the blades can be replaced individually. This configuration is because the dual-rotor engine structure is beneficial to improve efficiency, and the second is to reduce production costs. The compressor is good, but the materials and craftsmanship are too expensive. If all the compressors are used, it is very uneconomical.

For this reason, the combustion chamber is made of nickel alloy steel sections, which are manufactured through complex machining. This alone cannot meet the ultra-high temperature burning in the combustion chamber. Therefore, Ascendas Group has added a Layer of high-temperature resistant ceramic coating, so that the fuel can be fully burned, thereby reducing pollution, increasing fuel efficiency, and improving economy.

However, to achieve this purpose, a flame tube is needed to cooperate, and the flame tube of the WD-52ML turbofan engine uses a central low-pressure fuel injection system with 18 flame nozzles, which can easily ignite the fuel and fully burn it.

In addition, the maintainability of the flame tube is also very good, not to mention that it can be easily disassembled, and it can also be inspected with the hole probe equipment of Ascendas Group.

Of course, the fan, the air compressor and the combustion chamber are strong. No matter how well the turbine is matched, it is useless. The turbine of the WD-52ML turbofan engine uses a high and low turbine structure.

The high-pressure turbine has 2 stages and the low-pressure turbine has 4 stages.

The six turbine turbine disks are all manufactured using powdered superalloy technology. The high-pressure turbine blades are made of nickel alloy single crystal cast cold hollow blades based on powdered superalloy technology, using film cooling technology and high temperature resistant ceramic coating technology.

The combination of such advanced technologies has increased the temperature in front of the turbine to 1,360 degrees Celsius, thereby making the performance of the WD-52ML turbofan engine a qualitative leap.

The first two stages of the low-pressure turbine adopt nickel alloy single crystal blades with powdered superalloy technology, and high-temperature ceramic coatings are applied, but film cooling is not used; the latter two stages use ordinary nickel-based alloys.

While reducing costs, it also ensures the reliability of the engine.

After such integration, the maximum thrust of the WD-52ML turbofan engine reached 5.2 tons, and the thrust-to-weight ratio was even closer to 6. It was 5.96.

It is no exaggeration to say that it is the master of aero engines of Ascendas Group for more than ten years.

The significance of this is that it not only demonstrates Ascendas Group’s superior aero engine technology research and development capabilities, but more importantly, the WD-52ML turbofan engine will become the foundation of Ascendas Group’s aero engine field in the next ten years.

Because the core engine derived from the compressor, combustion chamber and high-pressure turbine in the WD-52ML turbofan engine fully meets the initial requirements of the second-generation core engine of Ascendas Group, and a little improvement and perfection can become the future of Ascendas Group. The main core aircraft of many aircraft engine models.

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 is concerned, the importance to the Ascendas Group is also self-evident.

Because with the success of the WD-52ML turbofan engine, Ascendas’ Costin plan can continue. By then, the 50-seat and 70-seat regional airliners can not only land smoothly, but also the ultra-luxury long-range business jets. Obstructed mount.

In addition to the regional passenger aircraft, the impact on the trainer of Ascendas Group is also huge.

It is necessary to know that the WD-52ML turbofan engine can be easily changed into a turbofan engine with a small bypass ratio. Ascendas Group has conducted tests in this regard. The small bypass ratio version of the WD-52ML turbofan engine has normal thrust. It 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 indicator has surpassed the turbojet-13 engine currently used by the JJ 7MAX.

A turbofan engine that is superior to the turbojet-13 is not only a solution to the problem of the Ascendas Group’s JJ7MAX, but also a very subversive existence for the entire country. It is necessary to know that the domestic equipment turbojet-13 and There are many aircraft with the previous generation of turbojet-7 engines. Needless to say, the J-8, the main force in domestic air combat, uses turbojet-13 engines.

A few years ago, it was like replacing the turbojet-14 with greater thrust, but the reliability of the engine was not high, and it was easy to fly into the sky with inexplicable parts. In desperation, it could only be replaced by the turbojet-13.

Now a WD-52ML turbofan engine version with a smaller bypass ratio that is better than the turbojet-13 is available, and its vast progress is self-evident.

The reason why it was not launched immediately, replacing the turbojet-13 and occupying the domestic military aircraft’s aero engine market, was mainly due to the size problem. After all, the WD-52ML turbofan engine has a larger bypass than the diameter of about 1.2 meters, and a small bypass is even more than the diameter. Less than 0.8 meters.

The engine compartments of the F-7 and F-8 have long been given a diameter of about one meter by the turbojet 7 or turbojet 13.

It is obviously unrealistic to adapt the J-7 and J-8 to the WD-52ML turbofan engine~www.readwn.com~ That is tantamount to rebuilding two aircraft, only the WD-52ML turbofan engine can be used to adapt to the current domestic combat aircraft. .

Therefore, the size must be increased, and the various indicators of aeroengines can affect the whole body. Increasing the size may seem simple, but in the aeroengine, it means the increase of the intake air volume, the increase of the compression ratio, and the more violent combustion. The temperature in front of the turbine will increase further.

The result is a further improvement in performance.

For this reason, Ascendas Group calculated that without making other adjustments, it derived a 1050mm diameter, 5684mm length and a net weight of 1.2 tons with a small bypass ratio turbofan aero engine based on the core components of the WD-52ML turbofan engine. The thrust will be increased to 5.6 tons, the afterburner thrust will reach 8.7 tons, and the thrust weight will reach 7.

This value can already be compared with the Soviet RD-33 turbofan engine and the American F-404 engine. It is only slightly worse than the F-414 engine that is about to be developed in the United States. The problem is that GM can be based on the F-404. After developing F-414, why can't Ascendas Group continue to advance on the basis of WD-52ML turbofan engine?