Hendrik_2000
Lieutenant General
A monumental development historic first Here is another one from Oedo
Chinese Engine Development
- Thread starter jackbh
- Start date
Last one.
And the translation of :
CJ-1000AX core machine to achieve 100% stable operation
On December 25, 2017, the core of CJ-1000AX large-scale passenger aircraft engine was stabilized at 100% design speed in Shanghai, which provided strong support for further in-depth experimental verification.
The core machine consists of high-pressure compressor, combustion chamber and high-pressure turbine and related systems, the actual temperature, pressure, speed is extremely high, the technical complexity and difficulty represent the highest level of machinery. The main purpose of the core machine test is to verify the performance, function and matching of various components and related systems, expose the problems in advance and reduce the risk of the whole machine development. The core machine test lasted 39 days, a total of 46 tests, a preliminary verification of the core machine components and related systems performance, function and matching, but also verified the compressor block prediction, combustion chamber ignition prediction, turbine work State analysis and the first development of the "skeleton characteristics" performance simulation model and other technologies to effectively supplement and enrich the development of core machine system.
And the translation of :
CJ-1000AX core machine to achieve 100% stable operation
On December 25, 2017, the core of CJ-1000AX large-scale passenger aircraft engine was stabilized at 100% design speed in Shanghai, which provided strong support for further in-depth experimental verification.
The core machine consists of high-pressure compressor, combustion chamber and high-pressure turbine and related systems, the actual temperature, pressure, speed is extremely high, the technical complexity and difficulty represent the highest level of machinery. The main purpose of the core machine test is to verify the performance, function and matching of various components and related systems, expose the problems in advance and reduce the risk of the whole machine development. The core machine test lasted 39 days, a total of 46 tests, a preliminary verification of the core machine components and related systems performance, function and matching, but also verified the compressor block prediction, combustion chamber ignition prediction, turbine work State analysis and the first development of the "skeleton characteristics" performance simulation model and other technologies to effectively supplement and enrich the development of core machine system.
Awesome! What a wealth of info!
Some surprises, some disappointments in there. In the former category I'd put the 10-stage (4 with variable stators) HPC, with the stated average stage pressure ratio that works out to about the same pressure ratio as the Leap-1, taking engine OPR into the 50:1 ball park. That makes for a hot compressor exit (durability concerns)! I would have perhaps expected a lower stage count with a higher stage PR (like the PD-14, though perhaps not quite as ambitious in terms of stage pressure ratio) and a slightly lower OPR.
As a disappointment I'd class the solid LP turbine blades (or is that a mistranslation of the Chinese text?) - the architecture and material choices mean the CJ-1000A will tend to be a fairly heavy engine, so hollow TiAL blades (as on the other next-generation narrowbody engines) would have been very beneficial. With a 195cm fan diameter, hollow titanium rather than composite blades, metal fan case and 10-stage HPC it'll probably weigh more than the Leap-1C (which in turn is heavier than the PW1100/1400G and PD-14), even with one LPT stage less. Speaking of the LPT stage count and fan diameter, at a rough guess BPR should be 9 (or slightly higher, but probably lower than 10) based on that. All in all, probably pretty good fuel burn (Leap-1B class) but possibly non-trivial weight penalty and potential for significant durability teething troubles.
Nice touch: "O-duct" nacelle & thrust reverser like the Leap-1C and PD-14 (no word on whether it's electrically actuated like these two though).
Some surprises, some disappointments in there. In the former category I'd put the 10-stage (4 with variable stators) HPC, with the stated average stage pressure ratio that works out to about the same pressure ratio as the Leap-1, taking engine OPR into the 50:1 ball park. That makes for a hot compressor exit (durability concerns)! I would have perhaps expected a lower stage count with a higher stage PR (like the PD-14, though perhaps not quite as ambitious in terms of stage pressure ratio) and a slightly lower OPR.
As a disappointment I'd class the solid LP turbine blades (or is that a mistranslation of the Chinese text?) - the architecture and material choices mean the CJ-1000A will tend to be a fairly heavy engine, so hollow TiAL blades (as on the other next-generation narrowbody engines) would have been very beneficial. With a 195cm fan diameter, hollow titanium rather than composite blades, metal fan case and 10-stage HPC it'll probably weigh more than the Leap-1C (which in turn is heavier than the PW1100/1400G and PD-14), even with one LPT stage less. Speaking of the LPT stage count and fan diameter, at a rough guess BPR should be 9 (or slightly higher, but probably lower than 10) based on that. All in all, probably pretty good fuel burn (Leap-1B class) but possibly non-trivial weight penalty and potential for significant durability teething troubles.
Nice touch: "O-duct" nacelle & thrust reverser like the Leap-1C and PD-14 (no word on whether it's electrically actuated like these two though).
antiterror13
Brigadier
Good one. Just a correction that WS-10 is not Chinese first turbofan engine. China started way back from 1960s .... WS-5, WS-6, WS-6A and WS-8 (cancelled)
Then WS-9 and the improved version WS-9 version 2 ... before finally the famous WS-10A in 2000s
Hendrik_2000
Lieutenant General
From Oedo
The CJ-1000A aims to complete the trial of the prototype (CJ-1000AX) in 2018, will conduct a test flight in C919 in 2022, plan to acquire the model certificate in 2025. The CJ - 1000A is 13000 kgf class high bypass turbofan engine, technically became the same generation as CFM LEAP.
Following the CJ-1000A, the CJ-1000B equipped with an extended cruise distance C919 will acquire model certification in 2026. CJ - 2000 as a candidate for onboard engine of CR 929 will be designed before 2020, plan to test prototype in 2022, plan to acquire type certificate 2030 years ago. CJ is the meaning of the Yangtze River.
The CJ-1000A aims to complete the trial of the prototype (CJ-1000AX) in 2018, will conduct a test flight in C919 in 2022, plan to acquire the model certificate in 2025. The CJ - 1000A is 13000 kgf class high bypass turbofan engine, technically became the same generation as CFM LEAP.
Following the CJ-1000A, the CJ-1000B equipped with an extended cruise distance C919 will acquire model certification in 2026. CJ - 2000 as a candidate for onboard engine of CR 929 will be designed before 2020, plan to test prototype in 2022, plan to acquire type certificate 2030 years ago. CJ is the meaning of the Yangtze River.
antiterror13
Brigadier
From Oedo
The CJ-1000A aims to complete the trial of the prototype (CJ-1000AX) in 2018, will conduct a test flight in C919 in 2022, plan to acquire the model certificate in 2025. The CJ - 1000A is 13000 kgf class high bypass turbofan engine, technically became the same generation as CFM LEAP.
Following the CJ-1000A, the CJ-1000B equipped with an extended cruise distance C919 will acquire model certification in 2026. CJ - 2000 as a candidate for onboard engine of CR 929 will be designed before 2020, plan to test prototype in 2022, plan to acquire type certificate 2030 years ago. CJ is the meaning of the Yangtze River.
How come China suddenly will have one of the most sophisticated civilian turbofan engines in the world ... if it is true the same generation as CFM LEAP
The engine looks extremely good though ...
Hendrik_2000
Lieutenant General
How come China suddenly will have one of the most sophisticated civilian turbofan engines in the world ... if it is true the same generation as CFM LEAP
The engine looks extremely good though ...
Don't forget it is still prototype It will take many years of thorough testing and expect set back and disappointment along the way. Nothing this complex will go smoothly specially not for nu bee.
But you are right China take a bold steps and she has the grit and gumption and wad of cash to follow it through. Certification 2025 is optimistic if everything goes well I expect delay