Can China produce aircraft engines?

I answer from the perspective of an industry-related worker:

First of all, in terms of design

At that time, the Soviets successively gave China the drawings, technical data and prototypes of turbojet -5 (for J-5), turbojet -6 (for J-6) and turbojet -7 (for J-7), but we didn't get two things. What is this?

One is the design principle, that is, why does this engine do this? What is its design principle and its hydrodynamic model?

The other is to design experimental data. Why should this elbow be made of this material? Can you make other materials? Bend 75 degrees, extend 8CM, and then bend 74 degrees? Can you extend it by 7.9CM? What are the consequences of positive deviation and negative deviation? Why is this design the best? What is the safety margin in the optimal design?

Without these things, people in China made a 5/6 turbojet in the factory. On this basis, some people commented that in the 1950s, the gap between China and Americans, that is, the gap from half a generation to a generation, widened. Including the article you saw, singing loudly that we were behind the Soviet Union in the 1960s 10. Hehe, just kidding. Just because you can build it doesn't mean you can design such an engine. Your manufacturing ability may be half a generation behind others. How bad is your design ability? I don't know, because you are zero, you can't compare.

Without design ability, you still can't design a new engine, even if you change the existing engine, you don't know how to change it. China originally copied so many aero engines. In order to improve performance, most of them can only eat safety strength reserve and life reserve, at the expense of reliability and safety. In foreign countries, under the condition that the overall structure of the existing engine remains unchanged, the performance of the engine can be greatly improved only by making some small local improvements. It is normal to increase 120% to the prototype in 5- 10 years, and it will not affect the life and strength.

If you don't have design ability, don't say change, just don't know how to start with your existing ability. The service life of China's J-6 turbojet engine is only 100 hour, which is ridiculed by Americans as a "disposable engine" (in the same period, Americans have 1000 hour-1500 hour). Americans got the same turbojet 6, analyzed it, reassembled it, and doubled its service life. He's a master.

There are also materials and technology.

There are thousands of materials for aero-engines, ranging from steel, alloy steel and aluminum alloy to titanium alloy, ceramics and single crystal superalloy.

The production of these materials requires technology. For example, superalloys, such as directional solidification, single crystal growth, powder metallurgy, mechanical alloying, ceramic core, ceramic filtration and isothermal forging, have many processes. Now the fourth generation of American single crystal alloy has come out, and the second generation in China is rare. The gap of 30 years means less.

Materials have come out, and processing these materials also requires technology.

For example, the blade of an engine, the most advanced use is: directional solidification precision casting composite cooling hollow turbine blade without allowance-a difficult name to pronounce! Believe me, the workmanship of that thing is more difficult. The qualified rate of hollow oriented and single crystal alloy blades in the United States is 70%~90%, while in China it is 30%~40%, and some models are even less than 10%. Technology does not pass.