Braking performance of dual torus hydrodynamic retarder with different inclining and azimuth blade angles

To release the potential of braking performance of dual torus hydrodynamic retarder, research on effect of bowed blades with different extends of inclining angle and azimuth angles was conducted. Parametric models with different inclining and azimuth angles were defined for cascade in some type of dual torus hydrodynamic retarder, and single flow passages of rotor and stat or were built by the method of design of experiment (DOE). Numerical simulation was developed for computational models with variant configuration, and the effect of velocity field and turbulent kinetic energy distribution were analyzed, and the variation rules of braking torque with blade inclining and azimuth were acquired. The results show that braking torque may get its only peak value at the given inclining angle or azimuth angle, and at reasonable sets of inclining and azimuth angles, flow inside the hydrodynamic retarder was speeded up and loss of turbulent kinetic energy was increased, which lead to the notable raise of braking performance of hydrodynamic retarder.