Rotordynamic Characteristics of Floating Ring Seals in Rocket Turbopumps

Yuichiro Tokunaga; Hideyuki Inoue; Jun Hiromatsu; Tetsuya Iguchi; Yasuhiro Kuroki; Masaharu Uchiumi

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자료유형: 학술저널

저자정보: Yuichiro Tokunaga (Eagle Industry) Hideyuki Inoue (Eagle Industry) Jun Hiromatsu (Eagle Industry) Tetsuya Iguchi (Eagle Industry) Yasuhiro Kuroki (Japan Aerospace Exploration Agency) Masaharu Uchiumi (Japan Aerospace Exploration Agency)

저널정보: 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.9 No.3

발행연도: 2016.9

수록면: 194 - 204 (11page)

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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.

#cryogenics #shaft-seal system #FRS #floating ring seal #dynamic characteristics #rotordynamic coefficient

참고문헌 (15)

참고문헌 신청

[보고서] - NASA / 1978 / Liquid Rocket Engine Turbopump Rotating-Shaft Seals, NASA Space Vehicle Design Criteria (Chemical Propulsion)

[학술대회논문] - Oike, M. / 1995 / Characteristics of a Shaft Seal System for the LE-7 Liquid Oxygen Turbopump / AIAA-95-3102

[보고서] - Iwatsubo, T. / 1988 / An Experimental Study on the Static and Dynamic Characteristics of Pump Annular Seals : 229 ~ 251

[단행본] - Childs, D. / 1993 / Turbomachinery Rotordynamics: Phenomena, Modeling, and Analysis / John Wiley & Sons, Inc

[학술지(정기간행물)] - Arghir, M. / 2012 / Analytic Modeling of Floating Ring Annular Seals / Journal of Engineering for GasTurbines and Power 134 : 052507-1 ~ 052507-9

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