Vector engine, why use J-10B first?

As we all know, the design engine of J-20 is turbofan-15, and there were some vague photos on this vector engine network before. But recently, it was reported on the Internet that J-10B had installed a brand-new vector engine. Some analysts say this is the turbofan-15 vector engine of China J -20. So why is an advanced engine, the more advanced J-20, first used by J-10B fighters?

Few people know what turbofan-15 engine looks like. However, it is reported on the Internet that if the turbofan-15 is to be distinguished, it is enough to count the divergent parts on the nozzle. If the number is 15, it is a turbofan-15 engine. Although this statement has not been officially confirmed, according to relevant experts, the knowledge nozzle tested by J-10B is indeed related to China's new turbofan-15 vector engine. Therefore, some netizens questioned why the turbofan 15 was successfully developed and first tested on J-10.

In fact, some time ago, it was reported that the J-20 was refitted, but the new train of J-20 refitted focused on stealth, and the characteristics of vector thrust were not obvious, so analysts thought that the J-20 was refitted with a turbofan-10B engine, not the designed turbofan. Now turbofan-15 appears on the J-10 fighter, probably to test its performance and prepare for the final equipment of J-20. Moreover, it is equipped with J-10, because both fighters are made in Cheng Fei, which is convenient for testing.

Starting the installation test is indeed a major breakthrough for the turbofan-15 engine, and its significance is not only applied to the fifth generation engine, but also very obvious for the upcoming sixth generation engine. Therefore, it is expected that the turbofan 15 vector engine which is being tested on the J-10B fighter can complete the test as soon as possible, so that the J -20 can be reloaded as soon as possible and its performance can reach a new level.