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中文摘要：
大型水泵机组、水轮发电机组中由于转子偏心导致的流体激振会增大转子的振动,影响转子的安全运行。该文根据密封模型搭建了实验台,研究了喷水、喷气等反旋流方法对密封间隙内的流体激振的影响,对比了在不同情况下转轴振动幅值变化,结果表明具有合适喷射位置和喷射流量的反旋流对密封间隙内的流体激振起抑制作用,并初步得到抑制密封间隙内流体激振最佳喷射位置和喷射流量。通过数值模拟计算了在不同的喷射位置、不同喷射速度的反旋流对密封间隙内流场的影响,在一定程度上解释了实验结论,二者所得的规律统一,为反旋流技术抑制流体激振在工程上应用提供有效的依据。
英文摘要：
The fluid-induced vibration in the seal clearance would increase the rotor vibration in the large water pump and the hydroelectric generating set, which would affect the safely operating of rotor. The experiment rig is manufactured based on the seal model in this paper. The influence of water injection and gas injection to the fluid-induced vibration in the seal clearance is investigated by model experiment. The vibration amplitude of the rotor in different situations is contrasted. The result shows that the fluid-induced vibration in the seal clear- ance can be suppressed by the anti-swirl flow which has the right position and flow. And the best position and flow of the anti-swirl flow are found. The fluid field in the seal clearance is analyzed by numerical simulation in different conditions, including at different positions and with different velocities. The laws induced from experimental study and simulation calculation are consistent with each other. It provides ef- fective basis for using anti-swirl flow technique to suppress the fluid-induced vibration in engineering applications.
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