Chinese Engine Development

Can't edit, but there's a claim that the WS-10IPE is a 12% thrust improvement on the WS-10B. Then you get ~148 kN, which is inferior, but respectable.

Inst said:

Can't edit, but there's a claim that the WS-10IPE is a 12% thrust improvement on the WS-10B. Then you get ~148 kN, which is inferior, but respectable.

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If the highest thrust WS-10 is the WS-10B then its max thrust is 137 kN (14,000 kgf). If we use the 12% thrust improvement then the max thrust would be around 153 kN. This is inline with the 155 kN early estimates for the WS-10G now known as WS-10IPE.

But the problem is these figures are for max thrust in afterburner. For supercruise the dry thrust is critical. AL-41F1S produces 86+ kN and the F119 ~110 kN. YF120 thrust values are still to this date classified.

I'm wondering if that's designed for; the easiest way to improve dry thrust is to lower the bypass ratio. Since the J-20 is designed for long range, it might be better for the J-20 to go high-bypass a la T-50 and F-35 and use reduced drag to enable supercruise.

Inst said:

I'm wondering if that's designed for; the easiest way to improve dry thrust is to lower the bypass ratio. Since the J-20 is designed for long range, it might be better for the J-20 to go high-bypass a la T-50 and F-35 and use reduced drag to enable supercruise.

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How are the AL-41 and F135 engines even remotely considered to be "high-bypass" turbofans? High-bypass turbofans have bypass ratios of 5:1 or even 10:1 or more. The average low-bypass turbofan is less than 1:1. The F135 has a bypass ratio of 0.57:1. The AL-31F has a bypass ratio of 0.59:1, so the AL-41F isn't going to be much different from that.

The F-119 has a bypass ratio of .29. On the other hand, the J-20, if using high bypass, would have poor high altitude performance, something unsuited for an air superiority fighter.

Inst said:

The F-119 has a bypass ratio of .29. On the other hand, the J-20, if using high bypass, would have poor high altitude performance, something unsuited for an air superiority fighter.

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And yet the air superiority fighters F-15 and Su-27 both have engines with bypass ratio higher than .5...

I think not all of this is clear at this point. But given more time, we will know. I wouldn't overreact to what this guy says for now.

jobjed said:

Regarding non-Liyang information, we shouldn't take his word as complete gospel; however his Liyang information seems pretty accurate as he claims he works there. Regardless, his hearsay is probably far better than ours. He's

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a few times for training and often come across various tidbits of information about other institutes. It seems Liyang is developing a closer relationship with 624th judging from his comments about them.

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I think we are talking about a member in cjdby. I am surprised that this guy is still around in that forum after revealing his employment. His avatar is an ID photo of a real person, not necessarily his own. Although he did not reveal any classified information in the posts that I have read, it is still out of my imagination of Chinese security practice.

Note, in one of the thread in cjdby, there are members stated that this guy once posted his 工作证(company badge) with names being blocked to prove his credibility.

Something does not look right to me.

@latenlazy: Except that the F-22 has a higher service ceiling than both the F-35 and F-15, although I'd now argue that the choice of low bypass on the F-22 was more of a matter of being able to supercruise with engine thrust reduced by nozzle shape.

Inst said:

The F-119 has a bypass ratio of .29. On the other hand, the J-20, if using high bypass, would have poor high altitude performance, something unsuited for an air superiority fighter.

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This is totally meaningless. You could say the F-119 has a bypass of 0.29, but that doesn't make engines with bypass ratios of 0.5 or 0.6 "high bypass". Please stop appropriating terms for your own personal usage since they are not being used this way by anybody else in the world.