振动条件下旋流分离器内螺旋流的流固耦合研究

摘要

旋流分离器工作时受到外部流体的影响会产生振动,从而影响内部流场分布规律.为研究振动条件下旋流分离器内螺旋流的流固耦合作用,建立振动条件下旋流分离器的双向流固耦合模型,对同种激振频率下不同激振力的流固耦合作用进行数值模拟.结果表明:螺旋流场随着结构一起运动,而结构的运动引起了流场结构的偏移;周期振动下的流场径向速度变大,并随激振力的增大而增加;周期性激振力影响了切向速度的对称性,并使轴向速度近轴区域速度变大;不同截面的结构运动轨迹呈"O"型,振动形态呈抛物线状.%The hydrocyclone is affected by the external fluid and can produce vibration, resulting to the changing the distri-bution of internal flows. To study the fluid-solid coupling effect of spiral flow in hydrocyclones under the condition of vibra-tion, the two-directional fluid-structure coupling model with the same vibration frequency is established, where the fluid-structure coupling effect of different exciting forces is simulated. The results show that the spiral flow field moves together with the structure, and the motion of the structure causes the migration of the flow field. The radial velocity of the flow field in the periodic vibration becomes larger, and increases with the increase of the exciting force. The periodic exciting force affects the symmetry of the tangential velocity, and makes the axial velocity near the axial become larger. The trajectory of different cross sections of the structure takes the "O" type, and the vibration shape is parabolic.