Evaluation on sediment erosion of Pelton turbine flow passage component

Abstract

A rotating disc with jet nozzle experiment system is applied to study the anti-erosion performance of flow passage component matrix materials for Pelton turbine. The test condition such as sediment characteristics(concentration, hardness, mineral content), and flow velocity are designed to simulate the actual operating condition of prototype Pelton turbine. The resultant velocity in test is high to 107 ms-1. The anti-erosion performance of materials (ADB610, ZG25, 04Cr13Ni5Mo), which are used to fabricate needle and nozzle and bucket of Pelton turbine, was studied in detail on this experiment system. The experimental studies were carried on different resultant velocities and different sediment concentrations. Multiple linear regression analysis was applied to get the exponents of velocity and sediment concentration. The exponents for different materials are different. Basing on velocity exponents and concentration exponents acquired in tests, the sediment erosion prediction models for different materials were derived. Sediment erosion for different flow passage components, such as needle tip and nozzle ring and bucket of Pelton turbine in one China hydraulic power station, were evaluated on actual operating condition for different flow passage components.