Annular seal rotordynamic stability enhancement with circumferential spiral flow control using helical deflectors

Rotordynamic instability problem caused by seal force widely exists in turbo-machines. The fluid-induced force in the seal is determined by the pressure distribution associated with the flow field structure, particularly with the circumferential flow characteristics. In the previous study, the autho...

Full description

Saved in:
Bibliographic Details
Published inJournal of mechanical science and technology Vol. 36; no. 3; pp. 1263 - 1277
Main Authors Zhang, Mingjie, Yang, Jiangang, Zhang, Wanfu
Format Journal Article
LanguageEnglish
Published Seoul Korean Society of Mechanical Engineers 01.03.2022
Springer Nature B.V
대한기계학회
Subjects
Circumferences
Control
Control stability
Damping
Deflectors
Dynamical Systems
Engineering
Flow characteristics
Flow control
Flow stability
Helical flow
Industrial and Production Engineering
Labyrinth seals
Mechanical Engineering
Original Article
Pressure distribution
Rotor dynamics
Static stability
Vibration
기계공학
Flow field control
Rotordynamic stability
Computational fluid dynamics
Annular seal
Helical deflectors
Online AccessGet full text

Cover

More Information
Summary:Rotordynamic instability problem caused by seal force widely exists in turbo-machines. The fluid-induced force in the seal is determined by the pressure distribution associated with the flow field structure, particularly with the circumferential flow characteristics. In the previous study, the authors found that the helix-comb seal can effectively change the circumferential flow field. The specially designed helical deflectors can reverse the circumferential flow direction of the fluid inside the seal. A considerable static stability enhancement is obtained. However, the transient rotordynamic characteristics of the helix-comb seal are not reported. In the present study, the transient rotordynamic characteristics of the helix-comb seal are investigated further. The rotordynamic coefficients, effective damping, and aerodynamic work of the helix-comb seal are calculated and compared with those of the labyrinth seal. Results reveal that compared with the labyrinth seal, the helix-comb seal considerably improves rotordynamic stability, particularly at a high preswirl ratio. The desirable rotordynamic stability can be obtained with flow field control.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-022-0217-4