带凹槽结构的涡轮泵平衡活塞工作特性分析

在涡轮泵中设计平衡活塞结构是用来平衡轴向力的重要方法之一,平衡活塞通过调节涡轮泵叶轮和壳体间隙的压力分布降低轴向力大小,而在平衡活塞内增设凹槽结构则可以更好地平衡轴向力、扩大平衡轴向力的工作范围。针对凹槽结构的工作特性研究问题,建立了带不同凹槽结构的平衡活塞后泄漏流道数值仿真模型,并根据仿真结果对平衡活塞后泄漏流道内的...

Analysis on working characteristics of balanced piston with groove structure for turbopump

The design of balanced piston structure in turbopump is one of the most important methods to balance the axial force.The balanced piston reduces the axial force by adjusting the pressure distribution between the impeller and shell,while adding a groove structure in the balanced piston can better balance the axial force and expand its working range.In view of the working characteristics of the groove structure,a numerical simulation model of the balanced piston with different grooves was established,and the pressure distribution,flow characteristics and sensitivity analysis of the balanced piston were analyzed based on the numerical simulation results.The numerical simulation results show that the increase of inlet and outlet axial velocity caused by the groove structure,which is the radial velocity of the rotating static cavity,leads to a decrease of the total flow resistance,an increase of the leakage flow,and an increase of the pressure drop at the labyrinth seal.In addition,the decrease of the angular momentum and tangential velocity of the fluid flowing through the groove structure is the main reason for the decrease of the radial pressure difference.The upper part of the groove structure plays a major role in balancing the axial force,while the lower part has no obvious effect on balancing axial force.Moreover,the axial force is sensitive to the change of the groove width,but the change of the groove depth has little effect on it.