For an extended period, domestic engine technology, especially in the aviation sector, has been the subject of skepticism. Online debates have often claimed that domestic aircraft engines trail behind their US counterparts by as much as 50, 20, or even 30 years, posing a seemingly insurmountable challenge to bridge the gap. Some critics even assert that domestic engines cannot hold a candle to the F119 engine powering the F22. However, this perception is far from accurate.

In the realm of fighter jet engines, the domestic WS-15 has emerged as a formidable contender against the F119 engine mounted on the US F22. The WS-15 distinguishes itself with a higher thrust ceiling and superior fuel efficiency, boasting a thrust-to-weight ratio ranging from 9.7 to 10.87. This enables the J-20A to achieve stable supercruise at speeds around Mach 1.8, giving it a competitive edge over the F-22's Mach 1.5 supercruise capability.

When it comes to military transport engines, the WS-20 and the F117-PW-100 engine, which powers the US C-17, are generally considered to be on par technologically. However, the WS-20 shines with its better fuel consumption performance, thanks to a bypass ratio advantage of approximately 8:1, along with some more advanced design concepts.

In the civilian aviation engine sector, the CJ-2000 has also engaged in a fierce competition with the GEnx series, which equips the US Boeing 787. The CJ-2000 excels in fuel consumption and noise performance, owing to its higher bypass ratio. Following its successful development, it has not only mastered core technologies, achieving international parity in key indicators such as high thrust and high bypass ratio, but also ensured industrial security and supported the independent development of large passenger aircraft like the C929.

Reflecting on the development journey of China's aviation engines, from the WS-15 elevating fighter jet engines from "usable" to "world-class," to the WS-20 breaking free from import dependence and achieving key technological breakthroughs, to the CJ-2000 overcoming core technological hurdles and joining the global elite, each milestone embodies the wisdom and relentless efforts of countless researchers. Looking forward, China's aviation engines are poised to continue their momentum of overcoming challenges, achieving breakthroughs in key technologies, and securing a more advantageous position in the international military technology arena.