带导管鱼雷层流与湍流绕流计算

THE CALCULATION OF LAMINAR AND TURBULENT FLOW AROUND THE TORPEDO WITH RING WING

用分块耦合求解方法和自编三维软件计算了带导管鱼雷整体流场无冲角和有冲角的绕流问题,湍流计算采用Baldwin-Lomax湍流模型.计算雷诺数从103到107.计算冲角0～20°.在各种雷诺数计算,头部滞止压力（无黏流理论值为1.5）误差在10％范围内,总流量误差在5％范围内.对于不同冲角计算表明,升力系数在冲角15°范围内基本上线性增加,超过15°后升力系数缓慢减少.而摩擦阻力系数几乎与冲角无关,但压差阻力随冲角的增加而迅速增长.

Using domain decomposition method and own software solved the project of flow over torpedo with ring wing. The flow field solved was with angle of attack and without angle of attack at Reynolds number from third power of ten to seventh power of ten. The Baldwin-Lomax turbulent model was employed in calculation. The errors of pressure of numerical values at stationary point comparing with invicid value 1.5 were less than 10 per cent. The errors of outlet flux comparing with entrance flux are less than 5 per cent . The lift coefficient increased with angle of attack when angle of attack was no lager 15 degree, and when the angle of attack over 15 degree the lift coefficient was slowly decreasing. The coefficient of frictional resistance was no much difference as increasing of angle of attack but the coefficient of pressure difference was obvious increasing. There were complex flow pattern between hull and ring wing. The paper has shown the singular points in this area. The governing equations were primitive equations with pressure Poisson formation. The solver was based on Leap Prog implicit iterative methods with non-staggered grids. The domain decomposition method adopted to solve flow field around the torpedo in which Schwarz iterative method or Drichlet Neumann iterative method was employed to do loop for every sub domain.