修正的动力盘模型与三维模拟螺旋桨滑流比较

比较用于研究螺旋桨滑流对机翼影响的4种数值模拟方法,即未进行修正的动力盘数值模拟、修正的片条理论应用于动力盘模型的数值模拟、有旋转的修正的片条理论应用于动力盘模型的数值模拟及定常三维实体螺旋桨数值模拟求解RANS(Reynolds Averaged Navier-Stokes)方程.以某半径为1.008 m三叶螺旋桨在转速为2 575 r/min,飞行速度为 66.889 m/s 工况下螺旋桨后的轴向和环向诱导系数作为评估依据进行比较,结果表明:修正的动力盘模型和三维实体模型数值模拟能预测螺旋滑流区内的流动情况,而三维实体模型能更多地反映流动细节,但是会增加计算成本,表明动力盘模型可以替代三维实体螺旋桨进行数值模拟.

Slipstream characters comparison of improved actuator disk model and 3D propeller numerical simulation

Four different propeller simulation models were compared to study the influence of propeller slipstream by solving Reynolds averaged Navier-Stokes(RANS) equations, including two prediction methods of the standard strip theory with and without rotate velocity correction applied in the actuator disk models and the uncorrected actuator disk model and 3D propeller model on a certain condition (at free stream velocity 66.889 m/s, with propeller rotation of 2 575 r/min and propeller radius 1.008 m). Results of axial and tangential velocity distribution behind the propeller show that propeller slipstream area could be predicted by the actuator disk model and the 3D propeller model when more flow details are reflected by the 3D model with more calculation cost. It all proved that the numerical simulation of 3D propeller could be replaced by the actuator disk model.