Chinese Engine Development

[bsdnf]

Also, tender for engine ground inspection device; WS-19 is coming very very soon

 

[sunnymaxi]

Also, tender for engine ground testing equipment; WS-19 is coming soon
View attachment 163757

WS-19 actually arrived already.. its Pre flight check equipment tender.

 

[Alfa_Particle]

They compared it to the J-58, and at the very bottom of the last slide, it stated that the TBCC was considered the most suitable powertrain for Mach 4 flight.

They weren't just developing VCE for sixth-generation fighters, but also preparing for combined propulsion systems for spaceplanes.

TBCCE most likely will be what's powering 7th generation stuff - potentially sub-orbital "fighters."

 

[mack8]

Do i remember correctly that we discussed here about a VCE demonstrator being run even before 2020? And also, the characteristics of this triple duct VCE being tested, as well as hints of the VCE engines for J-36/J-50, do they give some credence to the theory about the 6th gens being designed for higher speeds than commonly believed, both supercruise and dash? Not necessarily MiG-31 fast perhaps, but still well north of Mach 2?

 

[bsdnf]

Do i remember correctly that we discussed here about a VCE demonstrator being run even before 2020? And also, the characteristics of this triple duct VCE being tested, as well as hints of the VCE engines for J-36/J-50, do they give some credence to the theory about the 6th gens being designed for higher speeds than commonly believed, both supercruise and dash? Not necessarily MiG-31 fast perhaps, but still well north of Mach 2?

To my knowledge, AECC's VCE project is progressing at least three years ahead than this. This is already a project that is "not advanced enough and can be made public".

 

[sunnymaxi]

Do i remember correctly that we discussed here about a VCE demonstrator being run even before 2020? And also, does the characteristics of this triple duct VCE being tested, as well as hints of the VCE engines for J-36/J-50, do they give some credence to the theory about the 6th gens being designed for higher speeds than commonly believed, both supercruise and dash? Not necessarily MiG-31 fast perhaps, but still well north of Mach 2?

yes. that being done in 2018 but that was from AECC Shenyang. demonstrator of variable cycle Engine. there are at least 2-3 different ACE/VCE projects currently going on in different AECC subsidiaries.

J-36 chief designer interview posted on J-36 special thread. guy revealed many things. it will be supersonic but not like MiG25/31..

 

[Engineer]

triple duct VCE demonstrator developed by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, has completed high-altitude test bench trials. Compared to the baseline engine with afterburner, fuel consumption is reduced by 37.5%, and specific thrust is increased by 47%.

This is just the institute's own test project, not the highly classified project for the sixth-gen fighter.
View attachment 163749
View attachment 163750

That's like putting the afterburner in its own dedicated bypass. I wonder if there would still be needs for an afterburner in the future, and if not, military engines in the future would be significantly shorter.

 

[Alfa_Particle]

triple duct VCE demonstrator developed by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, has completed high-altitude test bench trials. Compared to the baseline engine with afterburner, fuel consumption is reduced by 37.5%, and specific thrust is increased by 47%.

This is just the institute's own test project, not the highly classified project for the sixth-gen fighter.
View attachment 163749
View attachment 163750

Using bypass burners seems to match high-speed requirements better. The traditional method of changing the bypass air amount means that the compression ratio does not change by much and will be way too high for high-speed performance beyond Mach 2.2. A burner that bypasses the HP fans seems to solve this by allowing pressure ratios in the single digits similar to the Mig25 and Mig31 engine designs.

I can't quite tell, but does that mean all three bypasses stay open at all regimes instead of closing them off with F/RVABI?

I wonder how they'll incorporate contra-rotating spools here. LP-HP one way and IP the other? That seems more "conventional" but the gyroscopic forces might be worse than, say LP-IP one way and HP the other if that's possible.

If that penultimate turbine stage is indeed a rotor instead of a stator I think it's actually LP one way and IP and HP the other. Someone's correct me if I'm looking at this wrong...

 

[Deino]

triple duct VCE demonstrator developed by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, has completed high-altitude test bench trials. Compared to the baseline engine with afterburner, fuel consumption is reduced by 37.5%, and specific thrust is increased by 47%.

This is just the institute's own test project, not the highly classified project for the sixth-gen fighter.
View attachment 163749
View attachment 163750

Any more specifications (esp. thrust) besides this statement?

 

[qwerty3173]

yes. that being done in 2018 but that was from AECC Shenyang. demonstrator of variable cycle Engine. there are at least 2-3 different ACE/VCE projects currently going on in different AECC subsidiaries.

J-36 chief designer interview posted on J-36 special thread. guy revealed many things. it will be supersonic but not like MiG25/31..

There was only reveals saying that J36 "will not be a Mach 3 capable craft", and neither is the Mig25/31 in practical use. With a lower compression ratio turbine coupled with more efficient ram compression, turbofans work efficiently up to around Mach 2.8, the same speed as Mig25/31 are designed with. Active cooling can also cancel out the more sensible aerodynamic heating at this speed compared to Mach3+ speeds. In fact, I believe Mach 2.8 max speed was one of the design goals of the 4-engined Lockheed Martin 6th gen pre-design.