The development of China's WS19 engine is progressing smoothly, and mass production expected to be tested next year.
If the J-31/FC-31 can get a suitable engine, its overall performance will be greatly improved. Judging from the current technical level and public information of China's aviation industry, the current FC-31 "Yingying" is not likely to have super-patrol capability at present. China's second fifth-generation aircraft FC-31 was initially rejected by the Air Force, and a large part of this decision was due to the engine.
Compared with the American F-35, which is also a carrier aircraft, the J-31 thrust with two WS19 turbofans is about 24 tons, while the F35 has only 21 tons thrust. The J-31 has an empty weight of only 14.5 tons and the F35 is as high as 15.7 tons. It is 1.2 tons higher. In terms of combat load, Chinese sources claim the J-31 will be better than the F-35 and will be able to perform more functions than the F-35.
If only equipped with RD-93, the J-31 would have a hard time achieving supersonic cruise, becoming an incomplete fifth-generation machine; equipped with turbofan 19, J31 with a higher thrust-to-weight ratio can easily achieve supersonic cruise. Before Chinese equipment with the J-20, China’s understanding of the gap between the fourth-generation machine and the fifth-generation machine was not very clear; after the J-20, the differences in various aspects began to stand out, and the navy and carrier aviation also demanded the fifth-generation aircraft.
At the 2018 Zhuhai Air Show, the big vector engine is not only the one that is equipped on the J-10B, but also a quietly lying on the stand, proclaiming China's second stealth fighter – J-31 will soon have a domestic turubofan engine; this engine is the turbofan 19 Huangshan medium thrust engine that had only appeared in rumors in the past two years. For a double-engine medium-sized fighter, the thrust and fuel consumption of the large thrust engine are too large, wasteful money, and poor cost-effectiveness; the most efficient method is to install two medium-thrust engines, and the WS19 is such an engine. China Aviation Industry Corporation had previously disclosed a vector engine with a maximum thrust of 9800Kgf. This engine is considered by the outside world to be the WS-19 "Huangshan" engine matched with FC-31. This project has produced and successfully completed the development of QC185, QC400, GT25000G military ship-borne turbine shaft blades, WS18, WS19 turbofan engine shaft blade development, 624 AT project drones and other models to attack the mission. In mid-2017, China Aviation Industry Corporation first published an engine model called "Turbofan-19" (WS-19) for a summary of the results of the "Shaft-type blade universal combination tester". Some military observers revealed on the Internet that "TurboFan-19" is a long-rumored new Chinese engine. It is similar to the name of "Taihang" and "Emei", and the name of "TurboFan-19" is "Huangshan". The target of the turbofan-19 is the F414 turbofan engine, which is larger than the European EJ200 engine in terms of maximum thrust.
At some airshows in China a few years ago, there was an unidentified medium-thrust engine more than once. The maximum afterburning thrust was 9500kgf. In terms of appearance, this engine not only has a structure similar to the Russian RD93. There are also similarities with the European and American F404 and EJ200 engines. However, this engine appeared in the air show, there is no follow-up related information to prove that it uses the official model and name.