Injection type water turbine efficiency test bench

The invention provides an injection type water turbine efficiency test bench. The injection type water turbine efficiency test bench comprises a water tank, a water turbine set and a load flywheel set. The side wall of the water tank is communicated with an injection water cylinder, one end of the injection water cylinder is connected with the hydraulic turbine set through a guide cylinder, the other end of the injection water cylinder is connected with a hydraulic power system through a hydraulic pipe, and a pressure sensor and a displacement sensor are arranged in the injection water cylinder; the hydraulic turbine set is connected with the bottom of the water tank. One end of the hydraulic turbine set is connected with a right-angle reducer through a transmission shaft. The right-angle speed reducer and the load flywheel set are connected with the bottom of the water tank through a supporting frame, a water inlet pressure sensor is arranged at a water inlet of the load flywheel set, a water outlet pressure