"转桨式水轮机" can be translated into English as "Kaplan turbine".
The Kaplan turbine is a type of propeller turbine named after its inventor, Viktor Kaplan. It features adjustable blades both on the runner and the wicket gates, allowing for efficient operation over a wide range of water heads and flow rates. This characteristic makes it particularly suitable for low-head and high-flow hydroelectric power generation scenarios.