J101023 Rotordynamic Fluid Forces of Floating Ring Seal

Hiromatsu, Jun; Uchiumi, Masaharu; Nagao, Naoki; Eguchi, Masato

doi:10.1299/jsmemecj.2013._j101023-1

Cited by 1 publication

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“…The closing force at the secondary seal surface W f is: The friction coefficients µ at the secondary seal surface are determined by the Stribeck curve [10] approximated by experimentally measured results in our previous report [7]. The assumed Stribeck curve is shown in Fig.…”

Section: Rotordynamic Fluid Forcementioning

confidence: 99%

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Rotordynamic Characteristics of Floating Ring Seals in Rocket Turbopumps

Tokunaga

Inoue

Hiromatsu

et al. 2016

International Journal of Fluid Machinery and Systems

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Floating ring seals offer an opportunity to reduce leakage flows significantly in rotating machinery. Accordingly, they have been applied successfully to rotating machinery within the last several decades. For rocket turbopump applications, fundamental behavior and design philosophy have been revealed. However, further work is needed to explore the rotordynamic characteristics associated with rotor vibrations. In this study, rotordynamic forces for floating ring seals under rotor's whirling motions are calculated to elucidate rotordynamic characteristics. Comparisons between numerical simulation results and experiments demonstrated in our previous report are carried out. The three-dimensional Reynolds equation is solved by the finite-difference method to calculate hydrodynamic pressure distributions and the leakage flow rate. The entrance loss at the upstream inlet of the seal ring is calculated to estimate the Lomakin effect. The friction force at the secondary seal surface is also considered. Numerical simulation results showed that the rotordynamic forces of this type of floating ring seal are determined mainly by the friction force at the secondary seal surface. The seal ring is positioned almost concentrically relative to the rotor by the Lomakin effect. Numerical simulations agree quite well with the experimental results.

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Section: Rotordynamic Fluid Forcementioning

confidence: 99%

“…In our previous report [7], fundamental rotordynamic characteristics of floating ring seals for rocket turbopumps were investigated experimentally. A novel rotordynamic test stand [8] was constructed to measure rotordynamic forces under noncontact state conditions without the influence of other measurement components.…”

Section: Introductionmentioning

confidence: 99%