Investigating the Hydrodynamic behavior of a ۳-channel partial admission water turbine

Partial admission turbines typically operate to counteract fluctuations while maintaining high efficiency. However, partial admission itself leads to other losses that follow multiple parameters, including the geometric parameters of the turbine, which affect the flow distribution at the rotor's outlet and inlet. This paper addresses the design and simulation of a partial admission axial flow turbine, one of the types of modern axial flow turbines for converting the mechanical energy of water into electrical energy, in a turbine geometry including a rotor, a high-speed flow channel, and rotor blades. In this regard, by choosing the common Eppler ۸۱۷ blade and placing it in three channels with ۱۰ blades in each channel, and simulating the aerodynamics of the channel and blades with Ansys Fluent software, it was possible to have a suitable design for the number and type of turbine components in terms of aerodynamic forces. Finally, based on the analysis of the aerodynamic forces applied to the turbine in the simulation, such as the percentage increase in the pressure difference of the blades compared to their previous channels, it was observed that the difference between the first channel of the rotor blades and the third channel is ۳۰.۵%, and also the difference in the lift force of the first and third channels is ۵۳%. From this important point in the design, it was concluded that three channels and ۱۰ blades in each channel in two rows, each row containing five consecutive horizontal blades with a specific angle of attack, provide acceptable results in terms of aerodynamic forces.

کلیدواژه ها:

Partial Admission Turbine Design ، ComputationalFluid Dynamics ، Unsteady Flow ، TurbulenceModel ، Two-Dimensional NumericalAnalysis.