TY - GEN
T1 - Nonlinear Characteristics of a Heavy-Duty Gas Turbine Shaft System with Labyrinth Seal
AU - Zhang, Xiang
AU - Ding, Mingguang
AU - Li, Zhitong
AU - Zhao, Runchao
AU - Deng, Zongquan
AU - Jiao, Yinghou
AU - Yu, Guangbin
N1 - Publisher Copyright:
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2026.
PY - 2026
Y1 - 2026
N2 - This study investigated the nonlinear dynamic behavior of a full-length equivalent rotor-labyrinth seal (LS) system representing the actual shaft train of a heavy-duty gas turbine within its normal operational speed range of 20–3500 rpm. An equivalent mass approach, considering labyrinth seal forces modeled via an interpolation database method (IDM) and sliding bearing force formulated from short-bearing theory, is established. The results showcase that the system exhibits a clear progression from low-speed period-one motion to a broad quasi-periodic regime, approximately 1040–1840 rpm. The transfer into a complex motion forms above 2200 rpm. In the upper speed range, intermittent shifts between quasi-periodicity and weak chaos are observed, including broadband spectral features and isolated multi-period islands. Particularly in the final quasi-periodic domain, weak chaotic effect emerge, evidenced by local irregularities in Poincaré maps and positive excursions of the Lyapunov exponent, yet the rotor center remains constrained within a finite orbital envelope, effectively forming a stable limit cycle. This bounded behavior implies that even under nonlinear coupling with slight chaotic influence, the rotor system can sustain dynamically quasi-stable and confined motion to some extent within the designed operational range of the heavy-duty gas turbine.
AB - This study investigated the nonlinear dynamic behavior of a full-length equivalent rotor-labyrinth seal (LS) system representing the actual shaft train of a heavy-duty gas turbine within its normal operational speed range of 20–3500 rpm. An equivalent mass approach, considering labyrinth seal forces modeled via an interpolation database method (IDM) and sliding bearing force formulated from short-bearing theory, is established. The results showcase that the system exhibits a clear progression from low-speed period-one motion to a broad quasi-periodic regime, approximately 1040–1840 rpm. The transfer into a complex motion forms above 2200 rpm. In the upper speed range, intermittent shifts between quasi-periodicity and weak chaos are observed, including broadband spectral features and isolated multi-period islands. Particularly in the final quasi-periodic domain, weak chaotic effect emerge, evidenced by local irregularities in Poincaré maps and positive excursions of the Lyapunov exponent, yet the rotor center remains constrained within a finite orbital envelope, effectively forming a stable limit cycle. This bounded behavior implies that even under nonlinear coupling with slight chaotic influence, the rotor system can sustain dynamically quasi-stable and confined motion to some extent within the designed operational range of the heavy-duty gas turbine.
KW - Dynamic Response
KW - Heavy-Duty Gas Turbine
KW - Labyrinth Seal
KW - Nonlinear Characteristics
UR - https://www.scopus.com/pages/publications/105043097299
U2 - 10.1007/978-3-032-29037-3_12
DO - 10.1007/978-3-032-29037-3_12
M3 - 会议稿件
AN - SCOPUS:105043097299
SN - 9783032290366
T3 - Mechanisms and Machine Science
SP - 142
EP - 154
BT - Proceedings of the 12th IFToMM International Conference on Rotordynamics - Volume 2
A2 - Sopanen, Jussi
A2 - Choudhury, Tuhin
A2 - Kurvinen, Emil
A2 - Viitala, Raine
A2 - Holopainen, Timo
PB - Springer Science and Business Media B.V.
T2 - 12th IFToMM International Conference on Rotordynamics, IFToMM 2026
Y2 - 22 June 2026 through 26 June 2026
ER -