Chinese Engine Development

[quokka]

"China's Kede created their oblique angle 5 axis continuous CNC machine tool. They are used in high precision manufacturing, such as turbofan engine components."

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According to the embedded CCTV2 video, it is 40% more efficient at machining the turbofan blades than foreign tools.

 

[gelgoog]

Yeah if you want to generate power you gotta rotate a generator which means you need a turbine.

Not quite true. Even with a pulse detonation engine you can move a piston and use that to generate power.
You can convert linear to circular motion.

The main failure of the pulse detonation engines was always that you need to evacuate the tube before initiating another detonation. And the way to get more power is by increasing the frequency of detonations. So it is a catch-22. The rotating detonation engine does not have those limitations.

One big issue with detonation engines is that detonations are anything but silent. So it is unlikely you will see detonation engine technology used in civilian airports near populated areas.

 

[taxiya]

Wasn't there a paper where basically just the combustor is replaced by RDE, but the rest remains like a gas turbine? So more efficient fuel burning + benefit of Turbine for eletricity.

Something along this line but from a chinese paper

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Yes there was. It was mentioned in this forum too.

 

[ying1978]

Other than 3D printing, high-pressure die-casting is another technology which maybe the future. Gigacasting has been revolutionizing the automobile industry, I wonder whether casted parts are durable enough for aerospace applications.

 

[by78]

Variable-cycle engine for China's next-generation fighter program?

The above photo is of a 7-page article published by the journal "Technology Reward" (科技奖励) in November of 2018 that contains an interview with Mr. Liu Yongquan (刘永泉), who is the chief designer at Shenyang Engine Design Institute. Unfortunately, I do not have access to the article. However, from

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, I gleaned this tidbit:


Please help with the translation, as I'm not sure about how to translate the green part of the text.

Mr. Liu Yongquan makes an appearance again in the context of adaptive variable cycle engine. Can someone help translate the white board? Anything useful?

 

[Alfa_Particle]

Mr. Liu Yongquan makes an appearance again in the context of adaptive variable cycle engine. Can someone help translate the white board? Anything useful?

I don't see anything that strike me as groundbreaking on that whiteboard.

Circled in red, the top is "adaptive variable cycle engine" and below it is "increasing basic performance."

Circled in purple is "achieving adaptive system" and between the red and purple circle, "achieving variable cycle."

Graph on the right is force, in F, versus specific fuel consumption, in sfc. Curves of ACE (and I believe something else) in terms of installed and uninstalled.

Formula below is F(something) in terms of uninstalled thrust and the absolute value of inlet [something] thrust and something else.

On the left is "key technologies" with "high performance parts" being one of them. Rest are blocked.

 

[sunnymaxi]

I don't see anything that strike me as groundbreaking on that whiteboard.

Circled in red, the top is "adaptive variable cycle engine" and below it is "increasing basic performance."

Circled in purple is "achieving adaptive system" and between the red and purple circle, "achieving variable cycle."

Graph on the right is force, in F, versus specific fuel consumption, in sfc. Curves of ACE (and I believe something else) in terms of installed and uninstalled.

Formula below is F(something) in terms of uninstalled thrust and the absolute value of inlet [something] thrust and something else.

On the left is "key technologies" with "high performance parts" being one of them. Rest are blocked.

and its obvious, they won't reveal any groundbreaking specification on whiteboard. team knows very well this image will viral on internet.

 

[tonyget]

Very informative video

Professor Sun talked about the work from his team on CJ2000 and “a key military engine model”(WS-15 I suppose? ).

Such as：

WS-15 has better flight envelope than F-119

CJ2000's parameters are pretty decent and advanced

In his PPT，there is a slide mentioned "104核心机 core engine 104". I never heard of it before，seems like it is the core of WS-15？

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[Alfa_Particle]

Very informative video

Professor Sun talked about the work from his team on CJ2000 and “a key military engine model”(WS-15 I suppose? ).

Such as：

WS-15 has better flight envelope than F-119

CJ2000's parameters are pretty decent and advanced

In his PPT，there is a slide mentioned "104核心机 core engine 104". I never heard of it before，seems like it is the core of WS-15？

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With that, the J-20A should be even more ridiculous subsonically and/or at low altitudes.

Heck, even ultra-low altitude supercruising could be possible, if you need to for whatever reason.

 

[siegecrossbow]

Very informative video

Professor Sun talked about the work from his team on CJ2000 and “a key military engine model”(WS-15 I suppose? ).

Such as：

WS-15 has better flight envelope than F-119

CJ2000's parameters are pretty decent and advanced

In his PPT，there is a slide mentioned "104核心机 core engine 104". I never heard of it before，seems like it is the core of WS-15？

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View attachment 142988

View attachment 142992

View attachment 142991

View attachment 142990

View attachment 142986

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View attachment 142985

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Orca claims that the sentiment is correct but the graph showing flight envelope is for illustrative purposes only. No data leak.