...) as well as non-rotating 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 < Re < 3000) and Taylor Number...

... Abstract Zhang and Childs (2021) investigated the behaviors of a hole-pattern seal (hole depth H d = 1.9 mm) under wet-gas conditions. The hole-pattern seal’s rotordynamic coefficients were strongly frequency-dependent. Direct stiffness K increased as excitation frequency increased...

... and theoretical predictions calls for more improvements in the predictive model to handle hole-pattern seals with mainly-oil mixtures. hole-pattern seal oil/air mixtures multiphase pump rotordynamic coefficients leakage Proceedings of ASME Turbo Expo 2022 Turbomachinery Technical Conference...

... 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...

...% 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...

... coefficients. Keywords: Smooth Seal, Two-Phase Flow, Mainly Gas, Rotordynamic Coefficients, Leakage. NOMENCLATURE c Cross-coupled damping coefficient [FT/L] C Direct damping coefficient [FT/L] Ceff Effective damping [FT/L] Cij Damping coefficients [FT/L] Cr Seal s radial clearance [L] D Seal s inner diameter...

... 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...

... 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...

... 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...

... 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...