Seal dynamics of supercritical carbon dioxide turbine with the uncertain rotor nonlinear motion

IF 5 1区工程技术 Q1 ENGINEERING, AEROSPACE Aerospace Science and Technology Pub Date : 2024-08-15 DOI:10.1016/j.ast.2024.109493

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Abstract

The actual rotor motion and seal dynamics are nonlinear and uncertain. The uncertain effects include the seal flow and the rotor system parameters. While the influence of system parameters makes it more difficult to accurately predict the seal dynamics. A rotor nonlinear whirling model was established to achieve the synchronous solution of rotor motion and seal simulation. The coupling effect between rotor system parameters and seal aerodynamic performance was adopted. The actual seal dynamics for SCO₂ turbine were obtained and evaluated by the numerical finite difference method. In the rotor nonlinear whirling model, the rotor has the uncertain continuous free motion. The influence of the system main parameters, such as elastic recovery stiffness and unbalanced mass force, on seal dynamics is revealed. And the dynamic coefficients beyond the artificial specific disturbance frequency are shown. The results show that the rotor nonlinear whirling can better predict the seal dynamics. The rotation speed, elastic recovery stiffness and unbalanced mass eccentricity have different significant effects on seal dynamics.

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具有不确定转子非线性运动的超临界二氧化碳涡轮机密封动力学

实际转子运动和密封动态是非线性和不确定的。不确定的影响包括密封流和转子系统参数。系统参数的影响增加了精确预测密封动态的难度。为了实现转子运动和密封模拟的同步求解，建立了转子非线性漩涡模型。采用了转子系统参数与密封气动性能之间的耦合效应。通过数值有限差分法获得并评估了 SCO2 水轮机的实际密封动力学特性。在转子非线性漩涡模型中，转子具有不确定的连续自由运动。揭示了弹性恢复刚度和不平衡质量力等系统主要参数对密封动力学的影响。并显示了人工特定干扰频率之外的动态系数。结果表明，转子非线性旋转能更好地预测密封动力学。转速、弹性恢复刚度和不平衡质量偏心率对密封动力学有不同的显著影响。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.