【摘要】 在水下运动的水翼表面的局部低压区会形成空泡,而空泡具有随时间变化的非定常特性.采用DES(dettachededdy simulation)方法模拟绕水翼空泡流动的非定常特性.模拟了空泡的发生、发展、破灭、脱落的非定常过程,获得了空泡的发展、演变过程中水翼升力、阻力随时间变化的情况.模拟结果表明,空泡流动表现出明显的周期性特征;水翼的升力、阻力的周期性波动表现出同步变化的特征.将模拟结果与实验数据对比显示该方法可以准确地模拟空泡流动.更多还原

【Abstract】 Cavities can easily form in the low pressure zone on the surface of a hydrofoil moving under water.Detached-eddy simulation(DES) was applied to unsteady cavitating flows over a hydrofoil.The formation,development,collapse and detachment of the cavities were simulated.Consequent variations in lift and drag on the hydrofoil were obtained.Simulation results showed that cavitating flow has significant periodic characteristics,and lift and drag on the hydrofoil vary synchronously.Comparisons with experimental data showed that cavitating flows can be predicted well by the method discussed.更多还原