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Keywords: rotordynamic coefficients
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Proceedings Papers

Proc. ASME. GT2023, Volume 11A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics, V11AT22A024, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103158
..., 8.8, and 10 krpm) as well as nonrotating rotor case under zero pre-swirl condition. The rotordynamic coefficients for all the test conditions are obtained by pseudo-random excitation of the seal at multiple subsynchronous frequencies. By considering the transition Reynolds number (1000 < < 3000...
Proceedings Papers

Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT22A024, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83504
... 2Texas A&M University, College Station, TX ABSTRACT Zhang and Childs (2021) investigated the behaviors of a hole-pattern seal (hole depth Hd=1.9 mm) under wet-gas conditions. The hole-pattern seal s rotordynamic coefficients were strongly frequency-dependent. Direct stiffness K increased as excitation...
Proceedings Papers

Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT22A023, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83499
... predictions calls for more improvements in the predictive model to handle hole-pattern seals with mainly-oil mixtures. Keywords: hole-pattern seal, oil/air mixtures, multiphase pump, rotordynamic coefficients, leakage NOMENCLATURE C direct damping [FT/L] c cross-coupled damping [FT/L] Ceff effective damping...
Topics: Leakage, Pumps
Proceedings Papers

Proc. ASME. GT2021, Volume 9A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Design and Engineering, V09AT24A021, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-60106
...% but barely changes the test seal’s rotordynamic coefficients; i.e., the increased tooth clearance would not change the pump vibration performance. labyrinth seal tooth clearance oil-air mixtures multiphase pump rotordynamic coefficients leakage Proceedings of ASME Turbo Expo 2021...
Proceedings Papers

Proc. ASME. GT2021, Volume 9A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Design and Engineering, V09AT24A022, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-60108
... different flow Subscripts X, and Y directions of the coordinate system conditions. X, Y gas component g liquid component Keywords: smooth seal, multiphase pump, flow regime, l rotordynamic coefficients, leakage Acronyms gas volume fraction NOMENCLATURE GVF C direct damping [FT/L] c cross-coupled damping [FT...
Proceedings Papers

Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT25A001, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14118
... smooth seal two-phase flow mainly gas rotordynamic coefficients leakage Abstract Recent multiphase-pump developments encountered several rotordynamic issues with smooth balance-piston seals, creating a need to better understand the performance of annular seals under multiphase-flow...
Proceedings Papers

Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT25A007, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14267
... the machine efficiency. However, reducing C r can also introduce undesired effects on the machine’s vibration behaviors. This paper experimentally studies the impact of reducing C r on the leakage and rotordynamic coefficients of a 16-tooth see-through labyrinth seal under wet-gas conditions. The test...
Proceedings Papers

Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT25A008, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14268
... to pure-gas conditions. Zhang et al. (2019) conducted a comprehensive experimental study on the performance (leakage and rotordynamic coefficients) of a see-through labyrinth seal under mainly-gas conditions. This paper continues Zhang et al.’s (2019) research and studies the performance of the see...
Proceedings Papers

Proc. ASME. GT2007, Volume 5: Turbo Expo 2007, 843-848, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27501
... Rotor stability Rotordynamic coefficients Impeller-shroud forces Magnetic-bearing exciter Improved rotordynamic stability is desired by end users, and centrifugal compressor manufacturers are expected to meet, if not exceed, this expectation. Compressor manufacturers are required...
Proceedings Papers

Proc. ASME. GT2006, Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts A and B, 1211-1223, May 8–11, 2006
Publisher: American Society of Mechanical Engineers
Paper No: GT2006-90374
... impellers. The bulk-flow model is used to predict reaction force and moment coefficients for the impeller shroud. A labyrinth seal code developed by Childs and Scharrer [21] is used to calculate the rotordynamic coefficients developed by the labyrinth seals in the compressor stage and also provides...