Endwall heat transfer and aerodynamic performance of bowed outlet guide vanes (OGVs) with on- and off-design conditions

摘要

In this study, numerical simulations are conducted to investigate the effects of bowed outlet guide vanes (OGVs) on endwall heat transfer and aerodynamic performance. Both on- and off-design conditions are studied. For bowed vanes, the bowed angle varies from 10 degrees to 40 degrees and the normalized bowed height ranges from 0.1 to 0.3. Results are included for Nusselt number distributions on the endwall, the energy losses, the yaw angles, and near-wall flow structures. For the convenience of comparison, the straight vane is also studied as a baseline. It is found that the bowed vanes can effectively reduce the endwall heat transfer. Among the tested parameters, a bowed angle of 40 degrees and a normalized bowed height of 0.3 provide the best-controlled heat transfer for both the on- and off-design conditions. However, the bowed vanes have different effects on the energy losses and the yaw angles depending on the operating conditions. For the on-design condition with the inlet angle of 30 degrees (the incidence angle is 0 degrees) and the off-design condition with the inlet angle of 0 degrees, the bowed vanes do not significantly increase the energy losses and yaw angles, whereas for the off-design condition with the inlet angle of -30 degrees, significant changes are observed.