Bionic water turbine

The invention discloses a bionic water turbine and belongs to the technical field of power generation by fluid machinery. The bionic water turbine comprises a volute, a fixed guide vane, a movable guide vane, runners and a draft tube. A runner is located in the middle of the volute and is symmetrical around a rotating shaft, and the fixed guide vane and the movable guide vane are distributed in the volute. The bionic water turbine is characterized in that the runner comprises an upper crown, a lower ring and a blade connected between the upper crown and the lower ring; the head of the blade isin a shallow bionic shape composed of n arcs, the n arcs are tangentially connected, the tail of the blade is in a deep bionic shape composed of m arcs and a straight line, the m arcs are tangentially connected to the straight line, an inlet of the runner is connected to an outlet of the movable guide vane, and an outlet of the runner is connected to the draft tube. By fully considering the influence of changes of a wrap