So it sounds like this engine is optimized to have efficient cruise but also is also capable of Mach 2.0 speed at high altitude (18 km). Honestly if I had to take a blind guess this engine sounds like it’s designed for a bomber with supersonic dash capability. This is a completely blind guess on my part but if the H-20 was revised to have supersonic dash this might be the initial engine it’s meant to fly with.Was just trying to get a link but gave up. Have it in blurry screenshots instead:
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It's published under PLA/军工科技.