收稿日期:
2023-03-06
修回日期:
2023-04-14
接受日期:
2023-05-04
出版日期:
2024-01-25
发布日期:
2023-05-09
通讯作者:
陈东超
E-mail:cdc@neepu.edu.cn
基金资助:
Heyong SI, Yaoli WANG, Lihua CAO, Dongchao CHEN()
Received:
2023-03-06
Revised:
2023-04-14
Accepted:
2023-05-04
Online:
2024-01-25
Published:
2023-05-09
Contact:
Dongchao CHEN
E-mail:cdc@neepu.edu.cn
Supported by:
摘要:
超临界二氧化碳涡轮密封的气动特性与转子运动存在强耦合关系。在变转速运行时,密封-转子系统的动力学特性会发生不确定的变化。基于动力学方程建立密封-转子非线性涡动模型的用户自定义函数,实现密封流场仿真与转子动力学的同步耦合分析,得到转子升速过程中密封的气动特性和转子运动特征,揭示升速时密封-转子系统的动力学特性演变规律。研究结果表明:自转速度增加使转子涡动中心在进动方向发生横向偏移,涡动半径逐渐扩大。转子涡动中心先下沉后抬升。升转速过程中密封动力系数具有显著的波动,高频范围内刚度的绝对值较大,阻尼的绝对值较小,有效阻尼具有较大的波动,密封稳定性降低。低转速运行区间,直接刚度和交叉刚度具有显著的高频波幅。高转速区间,直接阻尼具有显著的低频波幅。转速升高使有效阻尼的波动逐渐向高频迁移。在200 Hz附近,有效阻尼具有较高的幅值和集中分布。
中图分类号:
司和勇, 王瑶俐, 曹丽华, 陈东超. 超临界二氧化碳涡轮升速过渡中密封-转子系统的动力学行为[J]. 航空学报, 2024, 45(2): 228652-228652.
Heyong SI, Yaoli WANG, Lihua CAO, Dongchao CHEN. Dynamic behavior of seal-rotor system in a supercritical carbon dioxide turbine during acceleration transition[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(2): 228652-228652.
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