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Chapter 1244 The core technology of J-8E

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    What¡¯s more, the headquarters clearly stated in the letter of intent for multi-purpose fighter tenders that improvements should be made based on mature old models so that the troops can quickly form combat capabilities while reducing maintenance costs.

    The J-8 improvement project that Northeastern Airlines Group finally won has been replaced by the J-7max. This is not just a matter of telling the headquarters. We just turned a deaf ear to your words. Some things can be done, but it is not good to say them out.  Well, at least the headquarters¡¯ face needs to be taken care of.

    Therefore, it is enough to use the body of the J-82 fighter jet as the basis and replace the wings, air intakes and integrated avionics system. After all, it is just a transitional combat aircraft. It is likely to become a full-time export foreign trade model in the future. It cannot be requested.  Too harsh.

    ¡°If it gets complicated and rapid mass production and rapid installation cannot be achieved, if it is delayed for several years, Project No. 10 will be finalized by then, and the Su-27 assembled with parts imported from Russia will also be fully rolled out.

    The J-8e, a so-called transitional combat aircraft, was directly pressed to the ground by these two light and heavy combinations of high and low before it could make the transition.

    Therefore, whether the J-8e is an improved version of the J-82 fighter or an alternative rebirth of the J-7max, the most important thing is to aim at the window period for the replacement of domestic second-generation and third-generation aircraft, and to build an efficient and fast aircraft.  Get involved and make some money.

    Therefore, it is required that this model must use mature technology from the inside out, so that it can be quickly finalized, mass produced, and equipped in batches to fill the window period.

    Needless to say, there are a series of subsystems such as the dsi inlet, the airfoil structure of the side wing and swept wing, and the integrated avionics system. Ascendas Group has been deeply involved in the JJ-7MAX for several years, and has verified it in the Zhenlong  Repeated verification was carried out on board,

    As for technology and production, Tengfei has already prepared several plans.

    If nothing else, the reason why the engine uses wd-58mvp instead of the more advanced wd-60 series is simply because wd-58mvp is more mature and is not difficult to mass produce on a large scale.

    The wd-62mpv with greater thrust is indeed very good. However, although there is no problem in production of this aeroengine using the 2.5-generation core engine, due to high technical requirements, the production cycle is very long, and the production capacity is still seriously insufficient.

    ??The wd-58mvp is a typical medium-thrust engine, with a thrust-to-weight ratio of 7.5, which is quite satisfactory. The core engine uses a relatively mature second-generation core engine.

    Although the performance is not very outstanding, the advantage is that the production cycle is short, the production cost is low, it can be put into production quickly, and it is independently controllable.

    Of course, on the basis of overall maturity, the J-8e multi-purpose fighter aircraft does not have new technological applications, such as metal additive manufacturing technology. The main structural frame of the J-8e fighter body is adopted from the nb-985plus developed by China Tengfei.  Produced by metal 3D printer.

    "Of course, we still encounter many problems in some key production areas" After giving a general introduction to the J-8e multi-purpose fighter, Zhuang Jianye suddenly changed the subject: "After all, the multi-purpose fighter is different from the previous high-altitude and high-speed combat aircraft.  Two different operational concepts.

    Therefore, shortening the fuselage is an inevitable choice. The problem is that shortening the fuselage brings an extremely serious problem, that is, the center of gravity of the structure is broken, so it is easy to cause the aircraft to stall in the air.

    Although we adopt a statically unstable design and cooperate with the fly-by-wire control system, this problem can be completely solved. However, at this stage, the fly-by-wire control system of this system is still under development and testing, and it is difficult to implement it in a short time. Therefore,  We still use a traditional mechanical control system on the J-8e, so the issue of center of gravity is an important difficulty we have to face"

    Zhuang Jianye spoke in great detail on this issue, and the military leaders naturally nodded slightly after hearing this. Zhuang Jianye was right. Although the fly-by-wire control system is a good thing, the fly-by-wire development cycle of an aircraft is the least.  It will also take eight years.

    After all, the entire system must be written to cover all conditions of the aircraft in all states. Light testing is a very complex and voluminous task, and it cannot be accomplished overnight.

    Therefore, although the J-8e's reported indicators include the fly-by-wire control system, it is only regarded as a later improved development model.

    Therefore, the center of gravity of the aircraft is a big problem. Even though the aircraft body is only shortened by 3 meters, the impact is indeed global.

    Because of this, the aircraft body must either add counterweights in certain places to offset the 3 meters cut off, or further reduce the structural weight of the remaining aircraft body so that the remaining aircraft body can reach a new balance.  .

    It is not impossible to increase the counterweight for aircraft, but it depends on the purpose of these counterweights. Needless to say, if it is to increase the bomb load or fuel load, these will help improve the aircraft's sustained combat capability.?The counterweight is of course beneficial, the rest is unnecessary.

    With the body space of the J-8, it is basically impossible to increase the beneficial load. If not, the wingspan of the J-8e multi-purpose fighter would not reach the value of 8.6 meters. In addition to improving the overall lift, the most important thing is  Large integrated fuel tanks can be installed inside the wings, thereby increasing the fuel capacity and improving the J-8e multi-purpose fighter's sustained combat capability.

    Since the counterweight method does not work, the only option is to reduce the structural weight.

    This brings about a problem. If you want to reduce the structural weight, you must use new materials and new processes. The long-term experiments and verifications brought about by this will inevitably slow down the development progress, and then make excessive models into obsolete models. Then  Some of the gains outweigh the losses.

    What¡¯s more, the cost of new materials and new processes is also very high, which also does not meet the low-price and high-efficiency requirements proposed by the headquarters.

    Based on the above, it is necessary to make subtractions within the original body frame of the J-82 fighter jet.

    The difficulty of not moving the material, the basic structure, and subtraction is not high.

    "Fortunately, we have the nb-985plus metal 3D printer, which enables the production process of one-time molding of large titanium alloy structural parts, and the overall performance is basically the same as that of similar foreign high-precision forgings.

    Therefore, we can use the nb-985plus metal 3D printer to produce the original 32 titanium alloy structural frames of the J-82 fighter jet with a length of 4.2 meters and a height of 1.6 meters.

    Due to the precise control of materials and the elimination of the welding process, the 32 titanium alloy metal frames have lost a total weight of 450 kilograms. Together with the 480 kilograms of weight loss from the two wd-58vip turbofan engines, the center of gravity has basically been rebalanced.  Require.  "

    After saying this, Zhuang Jianye paused and looked at the technical leaders, including senior researchers, with an undiminished smile. His voice rang again unhurriedly: "So leaders, if you want to ask us nb-985plus  I really can¡¯t say much about the applications of metal 3D printers.

    After all, the J-8e has just rolled off the production line and has not yet conducted flight experiments to verify how it is. I don¡¯t want to draw conclusions too early. Anyway, the J-8e is here now. Why don¡¯t we bother a few leaders to take a look in person and see what else we have?  If something is done improperly, leaders please don¡¯t worry about saving face. You should criticize and correct when necessary. After all, the core craftsmanship of the J-8e is all about this"

    As soon as these words came out, the technical leaders of the research team, who looked like faces in Sichuan opera, looked extremely ugly with their old faces. They looked at the extremely domineering J-8e and held it in for a long time. They were stunned and couldn't even say a word!

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