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http://dx.doi.org/10.9725/kts.2020.36.5.253

Measurements of Vibration and Pressure of an Oxidizer Pump for a 7-tonf Turbopump with a Modified Rear Floating Ring Seal  

Bae, JoonHwan (Turbopump Department, Korea Aerospace Research Institute)
Kwak, Hyun-Duck (Turbopump Department, Korea Aerospace Research Institute)
Choi, ChangHo (Turbopump Department, Korea Aerospace Research Institute)
Choi, JongSoo (Department of Aerospace Engineering, Chungnam National University)
Publication Information
Tribology and Lubricants / v.36, no.5, 2020 , pp. 253-261 More about this Journal
Abstract
In this paper, we present an experimental investigation of the frequency characteristics and a visual inspection of an oxidizer pump with a modified rear-floating ring seal for a 7-tonf turbopump. An oxidizer pump typically operates at high rotational speeds and under cryogenic conditions. Despite its low hydraulic efficiency, the floating ring seal is frequently employed as a leakage control solution for turbomachinery because it effectively reduces abrasion by friction. When the oxidizer pump starts up, the floating ring moves excursively but locks up stably against the pump casing when the contact pressure increases. The compressive force on the floating ring depends on the hydrodynamic forces induced by the flow through the floating ring. This force is controlled by the nose position of the floating ring. Based on a validation test for a 7-tonf turbopump with two types of floating rings, we concluded that the floating ring with a small diameter nose can move easily with a low contact pressure in the cooling path. This leads to instability of the pressure fluctuation around the floating ring. In contrast, a floating ring with a large diameter nose has a high contact pressure and attaches strongly to the casing, which causes wear and frictional oxidation between the contact surfaces of the impeller and the floating ring.
Keywords
floating ring seal; turbopump; oxidizer pump; high frequency signal; pressure fluctuation; static pressure;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Kim, J., Lee, E. S., Choi, C. H., and Jeon, S. M., "Current Status of Turbopump Development in Korea Aerospace Research Institute", IAC-04-S.P.17, International Astronautical Congress 2004, Vancouver, Canada, October 2004.
2 Huzel, D. K. and Huang, D. H., Modern Engineering for Design of Liquid-Propellant Rocket Engines, Chap. 1, AIAA Press, Washington D. C, 1992. (ISBN 1-56347-013-6)
3 Kwak, H. D., Kim, D. J., Kim, J. S., Kim, J. H., Noh, J. G., Park, P. J., Bae, J. H., Shin, J. H., Yoon, S. H., Lee, H. G., Jeon, S. M., Jeong, E. H., Choi, C. H., Hong, S. S., Kim, S. L., Kim, S. H., and Han, Y. M., "Performance Test of a 7 tonf Liquid Rocket Engine Turbopump", Journal of the Korean Society of Propulsion Engineers, Vol.19, No.2, pp.65-72, 2015.   DOI
4 Jeong, E. H., Kwak, H. D., Kim, D. J., Kim, J. S., Noh, J. G., Park, M. J., Bae, J. H., Shin, J. H., Wang, S. W., Yoon, S. H., Lee, H. G., Jeon, S. M., Choi, C. H., Hong, S. S., Kim, S. L., Kim, S. H., Han, Y. M., and Kim, J. H., "Performance Test of a 75 tonf Rocket Engine Turbopump", Journal of the Korean Society of Propulsion Engineers, Vol.20, No.2, pp.86-93, 2016.   DOI
5 Choi, C. H., Noh, J. G., Kim, D. J., Hong, S. S., and Kim, J. H., "Effects of floating-ring seal clearance on the performance of the pump", Journal of the KSFM, Vol.10, No.6, pp.38-43, 2007.
6 Kim, D. J., Choi, C. H., Hong, S. S., and Kim, J. H., "Effects of Impellers and Floating Ring Seals on Performance of Centrifugal Pumps", Transactions of the KSME, B, Vol.35, No.10, pp.1083-1088, 2011.   DOI
7 An, K. M., Lee, Y. B., Kim, C. H., and Ha, T. W., "Experiment Study on the Leakage Performance Characteristics of Floating Ring Seal", J. Korean Soc. Tribol. Lubr. Eng., Vol.20, No.4, pp.183-189, 2004, https://doi.org/10.9725/kstle.2004.20.4.183
8 Lee, Y. B., An, K. M., Kim, C. H., and Ha, T. W., "Comparison of Theoretical analysis with Test Results of Floating Ring Seals for the LRE Turbo Pump", Journal of the KSFM, Vol.7, No.6, pp.21-27, 2004.
9 Ha, T. W., "Analysis of Response of Floating Ring for High Pressure Floating Ring Seal in Turbo Pump", J. Korean Soc. Tribol. Lubr. Eng., Vol.21, No.3, pp.122-129, 2005, https://doi.org/10.9725/kstle.2005.21.3.122
10 Ha, T. W., Lee, Y. B., and Kim, C. H., "Leakage and Rotordynamic Analysis of Damper Floating Ring Seal with Round-Hole Surfaces in the High Pressure Turbo Pump", J. Korean Soc. Tribol. Lubr. Eng., Vol.19, No.6, pp.349-356, 2003, https://doi.org/10.9725.2003.19.6.349
11 Xia, P., Chen, H., Liu, Z., Ma, W., and Yang, B., "Analysis of whirling motion for the dynamic system of floating ring seal and rotor", Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology., 2019, https://doi.org/10.1177/1350650119829374
12 Lee, Y. B., Kim, K. W., Kim, C. H., An, K. M., and Lee, S. C., "Study on the Experiment of the Floating Ring Seal with Bump Foil for High Pressure Turbopump", J. Korean Soc. Tribol. Lubr. Eng., Vol.22,No.2, pp.105-111, 2006, https://doi.org/10.9725.2006.22.2.105
13 Mariot, A., Arghir, M., Helies, P., and Dehouve, J., "Experimental Analysis of Floating Ring Annular Seals and Comparisons with Theoretical Predictions", ASME Journal of Engineering for Gas Turbines and Power, Vol.138, No.4, 042503, 2016.   DOI
14 Xia, P., Liu, Z. S., Yan, J. J., and Zhang, G. H., "Lock-up Characteristics of Floating Ring Seals Considering Rotor Whirling Motion", Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology., 2017, https://doi.org/10.1177/1350650117718657