Artículo de revista
Hydrodynamic characterisation of a garman-type hydrokinetic turbine
Fecha
2021-05Registro en:
23115521
Universidad Autónoma de Occidente
Repositorio Educativo Digital
Autor
Lain, Santiago
Contreras Montoya, Leidy Tatiana
López Mejía, Omar Darío
Institución
Resumen
This paper presents a numerical study of the effects of the inclination angle of the turbine
rotation axis with respect to the main flow direction on the performance of a prototype hydrokinetic
turbine of the Garman type. In particular, the torque and force coefficients are evaluated as a function
of the turbine angular velocity and axis operation angle regarding the mainstream direction. To
accomplish this purpose, transient simulations are performed using a commercial solver (ANSYSFluent v. 19). Turbulent features of the flow are modelled by the shear stress transport (SST)
transitional turbulence model, and results are compared with those obtained with its basic version
(i.e., nontransitional), hereafter called standard. The behaviour of the power and force coefficients
for the various considered tip speed ratios are presented. Pressure and skin friction coefficients on
the blades are analysed at each computed turbine angular speed by means of contour plots and
two-dimensional profiles. Moreover, the pressure and viscous contributions to the torque and forces
experienced by the hydrokinetic turbine are examined in detail. It is demonstrated that the reason
behind the higher power coefficient predictions of the transitional turbulence model, close to 6% at
maximum efficiency, regarding its standard counterpart, is the smaller computed viscous torque
contribution in the former. As a result, the power coefficient of the inclined turbine is around 35%
versus the 45% obtained for the turbine with its rotation axis parallel to flow direction