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Effect of Radial Growth on Rotordynamic Characteristics of Labyrinth Seal-Rotor System

机译：径向生长对迷宫式密封-转子系统转子动力特性的影响

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Modern turbomachinery is progressing with regard to its compact geometry structure, superior thermodynamic efficiency, and high power density. The rotating speed, operating temperature, and pressure ratio of the turbine are significantly increased with this development. As a result, the centrifugal load and thermal load should be treated more seriously with these latest developments. To this end, the leakage model and fluid force model of the labyrinth seal and the dynamic model of the rotor system are established to take into account the centrifugal growth and the thermal growth. The effective seal clearance, axial flow velocity, and working fluid-exciting force are updated in each calculation step with the varying rotational speed or operating temperature. Using a three-dimensional (3D) contour map, spectrum cascade, and bifurcation diagram, the influences of the radial growth on the leakage performance and the dynamic characteristics of the rotor system are analyzed at steady state. The results show that the leakage flow rate and discharge coefficient are greatly reduced by the radial growth, which implies an improved sealing effect. The dynamic responses of the rotor system remain nearly unchanged when accounting for centrifugal growth only. Excluding the impact of the thermal growth, the system stability is slightly enhanced with the operating temperature. However, the system stability appears to be much more sensitive to temperature when thermal growth is included in the dynamic model. (c) 2019 American Society of Civil Engineers.
机译：现代涡轮机械在其紧凑的几何结构，卓越的热力学效率和高功率密度方面正在进步。随着这种发展，涡轮的转速，工作温度和压力比显着提高。结果，在这些最新进展中，应该更加认真地对待离心负荷和热负荷。为此，建立了迷宫式密封件的泄漏模型和流体力模型以及转子系统的动力学模型，以考虑离心增长和热增长。在每个计算步骤中，随着变化的转速或工作温度，更新有效密封间隙，轴向流速和工作流体激励力。使用三维（3D）等高线图，频谱级联和分叉图，在稳态下分析了径向增长对泄漏性能和转子系统动态特性的影响。结果表明，径向增长大大降低了泄漏流量和排放系数，这意味着改善了密封效果。仅考虑离心增长，转子系统的动态响应几乎保持不变。排除热增长的影响，系统的稳定性随工作温度的提高而略有提高。但是，当动态模型中包括热增长时，系统稳定性似乎对温度更加敏感。 （c）2019美国土木工程师学会。

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