Rotationally-induced unstable flow characteristics and structural optimization of rim seals

被引：0
|
作者：
Gao J. [1 ,2 ,3 ]
Cao F. [3 ]
Chu Z. [3 ]
Yue G. [3 ]
Zheng Q. [3 ]
机构：
[1] Center for Post-Doctoral Studies, Chongqing University, Chongqing
[2] Center for Post-Doctoral Research, Chongqing Jiangjin Shipbuilding Industry Co., LTD., Chongqing
[3] College of Power and Energy Engineering, Harbin Engineering University, Harbin
来源：
Zhongguo Kexue Jishu Kexue/Scientia Sinica Technologica | 2019年 / 49卷 / 07期
关键词：
Gas ingestion; Rim seal; Rotation induction; Sealing characteristics; Unstable flow;
D O I：
10.1360/N092018-00337
中图分类号：
学科分类号：
摘要：
In view of rotationally-induced unsteady rim sealing flow issues in the absence of mainflow nonuniform pressure fields, the large eddy simulation method validated by the enclosed rotating cavity flow measurement was adopted to investigate the instability of the flow in the enclosed rim seal cavity. On this basis, the unsteady Reynolds-averaged numerical calculation was carried out for three structures: typical axial and radial rim seals as well as the chute seal that is visible in actual engines. The unsteady sealing flow characteristics for typical rim seal structures are investigated. The dynamic characteristics of the large-scale vortex structures in the rim seal region are revealed by fast Fourier transform and cross-correlation analysis methods. Finally, the rotationally-induced sealing characteristics for different rim seal structures and the enlightenment of the seal structure optimization are given. The results show that the rotationally-induced rim sealing flow has inherent instability characteristics; a series of large-scale vortex structures are generated in the rim clearance region, which propagate in the circumferential direction at a speed lower than the rotor, and the vortex frequency, number of revolutions and number of vortices depend on the rim seal type; overall, the chute rim seal has the highest rotationally-induced sealing effectiveness. © 2019, Science Press. All right reserved.
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页码：753 / 766
页数：13
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