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为了探讨液体离心喷嘴中静态空间波动现象的物理本质,在经典理论的基础上分析了液体离心喷嘴中喷口处表面波的相速度和平均轴向速度的相等关系,通过结合CICSAM表面捕捉技术在自适应网格中求解耦合VOF方程的N-S方程组的数值模拟,在旋转轴对称的长喷口模型中获得了不同背压下的空间静止波型。数值模拟结果与经典重力波理论的类比表明:表面波有与液体平均轴向速度大小相等方向相反的相速度;波动由喷嘴的过渡段台阶激励起;波动能量传播速度小于相速度使波动在台阶后的喷口段显现。
In order to explore the physical essence of the phenomenon of static spatial fluctuations in a liquid centrifugal nozzle, the equal relationship between the phase velocity and the average axial velocity of the surface wave at a nozzle in a liquid centrifugal nozzle is analyzed based on the classical theory. By combining the CICSAM surface capture technique In the adaptive grid, the numerical simulation of the NS equations for coupled VOF equations is obtained. The stationary spatial modes under different backpressure are obtained in the long nozzle symmetrical rotating axis model. The results of numerical simulation and classical gravity wave theory show that the surface wave has the same phase velocity as the average axial velocity of the liquid; the fluctuation is caused by the step of the transition section of the nozzle; the propagation speed of the wave energy is smaller than the phase velocity, After the spout section appears.