射流中心 meaning in English

core of jet
jet - core region
jet-core region

Core region of jet
射流中心区
Francis turbine generator set of both vertical and horizontal types are suitable for water head from 10m to 300m . its feature is that the water flow enters the runner inward in a radial direction , changes direction gradually and then passes out axially
水斗式水轮发电机组适用于水头80 ~ 800米，是利用水流动能冲击水轮机转轮旋转作功，且其喷嘴的射流中心与转轮在同一平面上。