Experimental Study of Dynamical Charateristics of a Long Annular Seal (In the Case of Concentric Rotor and Outer Cylinder)

Kanemori, Yuji; Iwatsubo, Takuzo

doi:10.1299/jsmeb1988.32.2_218

Cited by 2 publications

(1 citation statement)

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“…Childs [5,6] proposed a finite-length method to calculate the dynamic coefficients of annular seals based on the Hirs' turbulent lubrication equations and perturbation method, and this method has been widely applied to the analysis of the stable motion of rotor-bearing-seal system. Kanemori and Iwatsubo [7,8] conducted groups of experiments to research the dynamic coefficients of long annular seals at various rotating speeds, whirling speeds, and pressure drops, they found the experimental results coincided fairly well with Childs' theory. However, the Childs' linear model will be no longer applicable in the case of large disturbance.…”

Section: Introductionmentioning

confidence: 78%

A coupling vibration model of multi-stage pump rotor system based on FEM

Wang¹,

Zhou²,

Wei³

et al. 2016

mech

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Section: Introductionmentioning

confidence: 78%

A coupling vibration model of multi-stage pump rotor system based on FEM

Wang¹,

Zhou²,

Wei³

et al. 2016

mech

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Numerical and Experimental Research on the Fluid-Induced Forces of Clearance Flow in Canned Motor Reactor Coolant Pump

Long

et al. 2019

Journal of Engineering for Gas Turbines and Power

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Reactor coolant pump (RCP) is one of the most important equipment of the coolant loop in a pressurized water reactor system. Its safety relies on the characteristics of the rotordynamic system. For a canned motor RCP, the liquid coolant fills up the clearance between the metal shields of the rotor and stator inside the canned motor, forming a long clearance flow. The fluid-induced forces of the clearance flow in canned motor RCP and their effects on the rotordynamic characteristics of the pump are numerically and experimentally analyzed in this work. A transient computational fluid dynamics (CFD) method has been used to investigate the fluid-induced force of the clearance. A vertical experiment rig has also been established for the purpose of measuring the fluid-induced forces. Fluid-induced forces of clearance flow with various whirl frequencies and various boundary conditions are obtained through the CFD method and the experiment. Results show that clearance flow brings large mass coefficient into the rotordynamic system and the direct stiffness coefficient is negative under the normal operating condition. The rotordynamic stability of canned motor RCP does not deteriorate despite the existence of significant cross-coupled stiffness coefficient from the fluid-induced forces of the clearance flow.

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Experimental Study of Dynamical Charateristics of a Long Annular Seal (In the Case of Concentric Rotor and Outer Cylinder)

Cited by 2 publications

References 1 publication

A coupling vibration model of multi-stage pump rotor system based on FEM

A coupling vibration model of multi-stage pump rotor system based on FEM

Numerical and Experimental Research on the Fluid-Induced Forces of Clearance Flow in Canned Motor Reactor Coolant Pump

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