Chapter 1536: Greater ambition

The work of imitating and continuing to develop this type of engine was handed over to the Gas Turbine Institute by Tan Zhenhua, who has always been "fat no water flowing outsiders' fields." This is not only because he is most familiar with the gas turbine institute, but also because, in his plan, in addition to In order to apply some of the advanced materials and technologies that China has now mastered to improve this type of engine by increasing thrust, reducing weight, and increasing its service life, it is also necessary to make a major engineering development on the basis of this type of engine-increase A section of afterburner is developed into a series of engines that can meet higher power requirements!
This work requires a thorough understanding of the performance of the entire engine and sufficient R&D technical strength to proceed. It just so happens that the Gas Turbine Institute and Rolls-Royce jointly launched a major project in the 1980s, that is, in the "Spay RB168 On the basis of the "Mk807" engine, a section of afterburner is added. The final result of this project is the only available military medium thrust engine in China-"Turbofan 7", Huashan.
When working on this project that year, Liu Daxiang once suggested that the main development work of the "TF41" in the two parallel projects should be carried out by Rolls-Royce, because Rolls-Royce had actually completed the engine before Huaxia participated in it. After completing most of the work, the rest is mainly to do the various test procedures that must be passed through for the official delivery of the engine and to make partial improvements to some designs; for another project, he suggested that the "MK807" engine should be increased in afterburner. The main research and development work of the combustion chamber is carried out by China, this is also to be able to smoothly learn from Rolls-Royce to develop an advanced turbofan engine development work ideas, basic development specifications and engineering implementation process.
At that time, Tan Zhenhua did not hesitate to adopt Liu Daxiang’s suggestion. In fact, the Huashan engine can be regarded as the first time in the history of the Gas Turbine Academy to complete the development process of half of the advanced turbofan aviation engine. The main work is Under the supervision and guidance of technical experts sent by Luo Luo, it was realized by Huaxia's engineers and technicians. Therefore, the Gas Turbine Institute can be said to be the most familiar with the development process of advanced turbofan engines among the four major aviation development units in China. The unit has a more successful experience on how to add an afterburner to a non-afterburner engine.
Of course, it can also be seen from this point that Tan Zhenhua has greater ambitions-according to the existing parameters of this AI-22 engine, its potential can be simply calculated. After adding the afterburner, it should be able to obtain about 4.5 tons. That is to say, the engine’s afterburner thrust-to-weight ratio can be increased to level 7. This is completely an international standard third-generation turbofan engine in the standard sense, although the technical difficulty of the small push is compared with that of the medium push Heda pushes lower, but this is undoubtedly an amazing achievement, and with this achievement as a base, he may further get involved in the field of trainers, which is the advanced class of trainers-advanced trainers!
In China, the "advanced trainer" currently in use is actually just one model-"Jiaoqi 7". When Tan Zhenhua wandered around at the Rongcheng Aircraft Factory, he took a ride and was dragged by a trainer to the sky. , But to be honest, he didn’t feel good about this type of trainer. This was definitely not because when he "tested" back then, the trainer deliberately flew in order to let him experience the feeling of driving a fighter plane more. After a few hours of work, he was dizzy, but because, in his previous life, in the military forums that gathered the world's keyboard man, the "Jijiao VII" was generally negatively evaluated.
Just look at the name, "Jiang 7" is an improvement and development from "J 7", but this type of trainer, which was successfully developed in 1987, does not inherit a series of advantages of the prototype "J 7", but has some of it. The inherent shortcomings are completely inherited, not only inherited, but also carried forward.
For example, the "J7" completely inherited all the aerodynamic layouts of the "J7". However, due to the need to install one more person in, the center of gravity of the entire aircraft inevitably changed, but the design unit failed to adapt to these changes. Adjusting the structure and layout of the aircraft resulted in the rapid energy loss of this type of aircraft when flying at high angles of attack, which was not suitable for long-term hovering, and indirectly affected the aircraft’s take-off and landing performance. As a result, the take-off and landing of the JJ-7 The speed is actually higher than that of the "J-7", let alone novice students, even veterans who are used to driving the "J-7" unanimously comment that this aircraft is much harder to fly than the "J-7"!
The trainer plane is harder to fly than the fighter plane. This slot-filled design makes Tan Zhenhua not know how to vomit.
There is also a more funny problem-the prototype "Mig 21" of the "Jiao 7" prototype was designed in the 1950s. The design methods at that time were still very primitive. The Mikoyan Design Bureau sacrificed in pursuit of the high-speed performance of the aircraft. The cockpit vision: the front vision is blocked by the windshield bulkhead and the nose, and the rear vision is completely blocked by the dorsal fin. This is also considered the most fatal weakness of this fighter in the Western world. This congenital inadequate body structure was not only inherited by the "Jijiao VII", but also carried forward. The height difference between the front and rear seats in the tandem is very small, resulting in the trainer in the back seat almost invisible. Later, in order to solve this problem, the Air Force Aviation School I had to figure out a set of fairly effective "earthly methods" to solve the problem by myself-assign a retractable periscope to the trainer in the back seat to observe the front, so as to prevent novice students from setting up the plane, especially during There was a problem during takeoff and landing training.
This is really not made up by the author, it is true historical facts.
I am afraid that the biggest advantage of this type of "Jiang 7" is that its flight instruments and basic maneuvers are the same as those of the "J 7" and "J 8" systems. It will be easier for students to adapt to these two types of fighters in the future. This type of fighter is also China’s only active trainer capable of supersonic flight so far. It allows students to fully appreciate the feeling of driving a supersonic fighter, which is quite different from the feeling of flying at subsonic speeds.
Since the F22 fighter aircraft of the United States has not been successfully developed at this time, so far, all the active fighters in the world must start afterburning to enter supersonic flight. In other words, whether they are equipped with engines with afterburners, It is a necessary condition for a type of aircraft to fly at supersonic speeds. So Tan Zhenhua wants to develop on the AI22 engine, and adding an afterburner to it can explain the problem very well-he must be planning a new supersonic aircraft, considering that the AI22 has a thrust force even after the afterburner It is only 4.5 tons, so even if it is equipped with two engines of this type, it can only propel a light aircraft, and then think of the "Super 7" that he invested in mass production, which is the "Fierce Dragon" fighter. There is no need to re-invest in a new fighter aircraft using dual-engine small pushes. Therefore, Tan Zhenhua’s goal has and only one possibility-he is planning a brand-new advanced trainer capable of supersonic flight, and only this The AI22 afterburner model is needed for this kind of aircraft!
Those who are familiar with Tan Zhenhua can guess why he planned such a new aircraft even by instinct alone-there is no doubt that this aircraft must have a broad market prospect!