General Electric GE said that it has successfully completed the GE9X engine ceramic matrix composite CMC (ceramic matrix)
Composite) The second phase of component testing, which was performed by installing CMC components on a GEnx engineering verification machine.
The CMC material will also be used on the combustion chamber and turbine of the GE9X engine to provide powerful power for the Boeing 777X aircraft.
GE
The 9X engine is the world's largest aero engine, offering approximately 100,000 pounds of thrust, a composite fan casing with a diameter of approximately 3.4 meters, and 16 fourth-generation carbon fiber composite fan blades. Other features include a new generation of high-pressure compressors with a 27:1 ratio of 27:1, high efficiency and low emissions, 3rd generation TAPS
III combustion chamber, and combustion chamber and turbine using ceramic matrix composite CMC.
This project verifies that the engine has accumulated 1,800 thermal cycles in the most recent round of tests, including exposure to harsh environmental conditions such as dust and debris. GE says the level of debris exposure is equivalent to about 3,000 takeoff and landing cycles.
For the second round of testing, the engineering verification engine also used the same CMC burner lining as the first round of testing in September 2015, the high pressure turbine first stage 匣 and the high pressure turbine level 2 CMC vane, and a new addition. High pressure turbine stage 1 CMC vane.
The CMC material combines silicon carbide ceramic fibers on a silicon carbide substrate and is reinforced with a proprietary coating that weighs only one-third the weight of a metal alloy of the same volume, thereby improving the fuel efficiency and durability of the engine.
In addition, CMC is more heat-resistant than metal alloys, requiring less cold air during operation, allowing more air in the main flow to be used for work, thereby improving engine performance, durability and fuel economy.
GEnx
The CMC engineering validation engine also adds GE9X engine components for non-CMC materials, including lightweight low-pressure turbine titanium aluminum blades made with new 3D technology and next-generation high-pressure turbine stage 1 rotor blades with advanced cooling technology.
The model certification for the GE9X engine program will begin in the first half of this year and will be tested on the GE Aviation Flight Test Platform, which is expected to be available in 2018.
It is worth mentioning that GE has invested a lot in the development of GE9X engines. In 2014, GE invested more than $1 billion, of which about $300 million was used for the new GE9X engine technology maturity test. Test items include General Propulsion Simulator (UPS) fan performance testing and GEnx engine CMC component testing.
In September 2015, the GEnx engineering verification engine with multiple CMC components completed a total of 2,800 durability cycle tests, which were respectively in AVIO, Naples, Italy.
The AERO test bench and the Pebble test bench in Ohio, USA, the test results were better than expected: when the engine was scrapped, the CMC components were still in a completely new state, which further confirmed the uniqueness of CMC technology.
In December 2015, the new GE9X engine core prototype was tested. In February 2016, GE announced the first complete GE 9X aircraft engine assembly.
Japan's Ishikawajima Heavy Industries, France's Safran Aircraft Engine Company, France's Safran Aviation Booster and Germany's MTU Aero Engines are all involved in the GE9X engine project.
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