Numerical Simulation on the Gas-Phase Flow Field in 90° Curved Duct with Different Inclination Angle

Based on the large eddy simulation (LES) method, the gas-phase flow field in 90° curved ducts with different inclination angle was numerically simulated. The results indicated that the gas-phase flow field in 90° curved ducts with inclination angle was different from that without inclination angle. As the influence of inclination angle, the secondary flow was delayed and the circumfluence zone was decreased, which were help to improve the flow condition in 90° curved ducts. Additionally, the tangential velocity at the outlet of 90° curved ducts increased with the increasing inclination angle. It was implied that the particles could obtain strong centrifugal force and high separation efficiency. However, the pressure drop also increased with the increasing inclination angle and consequently it led to the energy loss of curved ducts. Hence, the inclination angle should be optimized.