Numerical investigation on coolant fluid flow in the complex curved pipelines


Аuthors

Mitrofanova O. V.1, 2*, Bayramukov A. S.2**

1. ,
2. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 31, Kashirskoe shosse, Moscow, 115409, Russia

*e-mail: omitr@yandex.ru
**e-mail: bayramuks@gmail.com

Abstract

Complex curved pipelines of the marine nuclear power installations cause the generation of the stable vortexes in the coolant circuits. One of the most dangerous accidents in the marine nuclear power installations is a burst of the pressurizer’s pipe. Problem of the hydrodynamics of coolant fluid flows features through curved pipelines have to be investigated due to the frequency load of the pressurizer. This investigation is a basis to increase safety operation life of the nuclear power installations. Simplified geometric model including typical structural parts was chosen to study the problem. Verification of the computational model was based on the qualitative and quantitative analysis of the various turbulent models. The most appropriate model has been selected. The initial and boundary conditions were chosen from operation data of the marine nuclear power installation pressurizer’s system. As a result of numerical investigation, velocity and helicity fields in the cross sections of the pipeline were obtained. The features and regularities of the fluid flow and transformation of vortex structures, which occurs after bends in the different directions and their combinations are revealed. The analysis will be the main information for the further research of the pressurizer’s pipe system reliability and durability problems of ship nuclear power installations.

Keywords:

hydrodynamics, vortex structures, fluid flow swirl, nuclear power facilities, safety

References

  1. Mitrofanova O.V. Gidrodinamika i teploobmen zakruchennykh potokov v kanalakh yaderno-ehnergeticheskikh ustanovok [Hydrodynamics and heat exchange of the vortex fluid flow in the nuclear power plant circuits]. Moscow: FIZMАTLIT, 2010. 288 p. In Russ.

  2. Kostin V.I., Panov Y.K., Polunichev V.I., Yakovlev O.A. Rezul'taty ehkspluatatsii RU atomnykh sudov Rossii i opyt prodleniya ikh naznachennogo resursa [The results of Russian marine nuclear reactors operation and experience of the operation life expanding ]. Available at: http://www.okbm.nnov.ru .(accessed 15.08.2017). In Russ.

  3. Dean W.R. The streamline motion of fluid in a curved pipe. Phil. Mag., 1928, no. 30,. pp. 673–693.

  4. Goldstein S. Modern developments in fluid mechanics. Oxford University Press, 1938.

  5. Schlichting H. Boundary-layer theory. McGraw-Hill, 1955.

  6. Bertelsen A.F. An experimental investigation of low Reynolds number secondary streaming effects associated with an oscillating viscous flow in curved pipe. Journal of fluid Mechanics, 1975, no. 70, pp. 519–527.

  7. Ward-Smith A. Internal Fluid flow. The fluid dynamics of flow in pipes and ducts. Clarendon Press. 1980. 566 p.

  8. Kalpakli A. Experimental study of turbulent flows through pipe bends. CCGEx & Linne Flow Centre, KTH Mechanics, Royal Institute of Technology SE-100 44 Stockholm, Sweden, 2012. 127 p.

  9. Hellstrom L.H.O., Zlatinov M.B., Cao G., Smits A.J. Turbulent pipe flow downstream of a 90° bend. Journal of Fluid Mechanics, 2013, vol. 735, R7. DOI:10.1017/JFM.2013.534

  10. Kim J., Yadav M., Kim S. Characteristics of secondary flow induced by 90-degree elbow in turbulent pipe flow. Engineering Applications of Computational Fluid Mechanics, 2014, vol. 8, no. 2, pp. 229–239.

  11. Sudo K., Sumida M., Hibara H. Experimental investigation on turbulent flow in a circular-sectioned 90-degree bend. Experiments in Fluids, 1998, no. 25, pp. 42–49.

  12. Panov Y.K. Obosnovanie vybora granits distantsionnogo podderzhaniya srednej temperatury v reaktore iz usloviya uvelicheniya resursa sistemy KD atomnykh ledokolov [Rationale of the average temperature selection in the icebreaker’s nuclear power installation in order to increase operation life of the pressurizer’s pipe system]. OKBM Afrikantov. Nizhny Novgorod. Technical report, 2000. In Russ.

  13. Bayramukov A.S., Mitrofanova O.V. Modelirovanie protsessov gidrodinamiki i teploobmena v perekhodnykh rezhimakh raboty sudovykh yaderno-ehnergeticheskikh ustanovok [Hydrodynamics and heat transfer simulations of marine nuclear power installations in transient modes]. Teplovye protsessy v tekhnike – Thermal processes in engineering, 2017, no. 5, pp. 211–216. In Russ.

  14. Dyadik A.N., Surin S.N. Energetika atomnykh sudov [Marine nuclear power engineering]. St.Peterburg: Sudostroeniye, 2014. 477 p. In Russ.

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