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Article

  • Title

    EXPERIMENTAL FACILITY FOR DETERMINATION OF CAVITATIONAL PROCESSES IN THE NPP PIPELINES

  • Authors

    Gerliga V.
    Zaporozhan V.
    Fylonych Y.
    Panchenko M.
    Sholudko A.

  • Subject

    ENERGETICS. HEAT ENGINEERING. ELECTRICAL ENGINEERING

  • Year 2020
    Issue 1(60)
    UDC 621.646.4
    DOI 10.15276/opu.1.60.2020.07
    Pages 61-67
  • Abstract

    The obtained experience during operating thermal and nuclear power plants has shown that the vibrations are one of the main causes of the cracks occurrence in the pipelines and elements of thermal-mechanical equipment. The large pressure drops that are accompanied by the appearance of non-stationary processes can occur at the places of throttles and valves installation. These processes are associated with the static and the total pressure pulsations in the system. The paper analyzes the international and domestic experience in the cavitation processes research, the nature of their formation, as well as methods of the registration. The report presents the design of the experimental facility that was developed for the studying of the cavitation processes in the NPP pipelines. Moreover, the paper was augmented by the description of the main design features of the installation components. The experimental stand is designed to study the processes that lead to the appearance of vibrations in the NPP pipelines at the places of the throttle installation. The installation is a closed circulation loop that filled by water. It should be noted that the selected arrangement of the main stand’s equipment allows changing the distance between the throttles, as well as their quantity. In order to ensure the occurring of the continuous cavitation process in the experimental facility, the mathematical model of the experimental stand was developed in advance. The results of the performed simulations have made it possible to select the necessary equipment according to the design's characteristics. The previous detailed analysis of non-stationary and stationary processes occurring at the locations of throttles was carried out using the ANSYS software package. The CFX module was used as the tool for cavitation’s simulation. For this purpose, Rayleigh-Pleset cavitation model was implemented. At the same time, for the first stage of the cavitation’s calculation, the SST model of the turbulence was chosen, and for the second stage - LES WALE. The experimental results will allow us to develop methods to reduce the level of vibrations in the relevant NPP equipment elements and to validate high-performance computational fluid dynamics programs for the stationary and non-stationary processes’ analysis of two-phase flows in the pipelines with throttle nozzles.

  • Keywords cavitation, throttle, nozzle, vibration, experimental facility, NPP, ANSYS, CFX
  • Viewed: 78 Dowloaded: 0
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  • References

    Література

    1. Zhang J.M., Qing Y.A.N.G., Wang Y.R., Xu W.L., Chen J.G. Experimental investigation of cavitation in a sudden expansion pipe. Journal of Hydrodynamics, Ser. B. 2011. 23 (3). P. 348–352.

    2. Biluš I., Morgut M., Nobile E. (2013). Simulation of Sheet and Cloud Cavitation with Homogenous Transport Models. International Journal of Simulation Modeling. 2013. 12(2). P. 94–106. DOI: 10.2507/IJSIMM12(2)3.229.

    3. Dular M., Coutier-Delgosha O. Numerical modeling of cavitation erosion. International Journal for Numerical Methods in Fluids. 2009. 61(12). P. 1388–1410. DOI: 10.1002/fld.2003.

    4. Jablonskб M., Kozubkovб D., Himr. Methods of Experimental Investigation of Cavitation in a Conver- gent – Divergent Nozzle of Rectangular Cross Section. Measurement science review. 2016. 16(4). P. 197–204.

    5. Luo J., Xu W.L., Niu Z.P., Luo S.J., Zheng Q.W. (2013). Experimental study of the interaction between the spark-induced cavitation bubble and the air bubble. Journal of Hydrodynamics, Ser. B. 2013. 25(6). P. 895–902.

    6. Bilus I., Bombek G., Hočevar M., Sirok B., Cencic T., Petkovsek M. (2014). The experimental analysis of cavitating structure fluctuations and pressure pulsations in the cavitation station. Journal of Mechanical Engineering. 2014. 60(3). P. 147–157. DOI:10.5545/sv-jme.2013.1462.

    7. Sou A., Hosokawa S., Tomiyama A. Effects of cavitation in a nozzle on liquid jet atomization. International Journal of Heat and Mass Transfer. 2007. 50 (17). P. 3575-3582.

    8. Yan Z., Liu J., Chen B., Cheng X., Yang J. Fluid cavitation detection method with phase demodulation of ultrasonic signal. Applied Acoustics. 2015. 87. P. 198–204.

    9. Ozonek J., Lenik K. Effect of different design features of the reactor on hydrodynamic cavitation process. Wroclaw, Poland. International OCSCO World Press. 2011. 52 (2). P. 112–117.

    10. Margot X., Hoyas S., Gil A., Patouna S. Numerical modeling of cavitation: validation and parametric studies. Engineering Applications of Computational Fluid Mechanics. 2012. 6(1). P. 15–24.

    11. Fuchs M., von Dirke M., Macdonald M., Waidmann W. Numerical RANS simulation of cavitation in throttles – approaches and first results. 56-th international scientific colloquium Ulmenau University of Technology. Innovation in Mechanical Engineering – Shaping the Future. 2011. 56. P. 1–6.

    12. Lomakin V.O., Kuleshova M.S., Kraeva E.A. Fluid flow in the throttle channel in the presence of cavitation. Dynamics and Vibroacoustics of Machines. Procedia Engineering. 2015. 106. 27–35.

    13. Menter F. CFD Best Practice Guidelines for CFD Code Validation for Reactor-Safety Applications, EVOL-ECORA-D01. 2002. 46 p.

    14. Shur M.L., Spalart P.R., Strelets M., Travin A. A Hybrid RANS-LES Approach with Delayed-DES and Wall-Modeled LES Capabilities. Int. J. Heat Fluid Flow International Journal of Heat and Fluid Flow. 2008. 29 (6). 1638–1649.

    References

    1. Zhang, J.M., Qing, Y.A.N.G., Wang, Y.R., Xu, W.L., & Chen, J.G. (2011). Experimental investigation of cavitation in a sudden expansion pipe. Journal of Hydrodynamics, Ser. B, 23 (3), 348–352.

    2. Bilus, I., Morgut M., & Nobile, E. (2013). Simulation of Sheet and Cloud Cavitation with Homogenous Transport Models. International Journal of Simulation Modeling, 12(2), 94–106. DOI: 10.2507/IJSIMM12(2)3.229.

    3. Dular, M., & Coutier-Delgosha, O. (2009). Numerical modeling of cavitation erosion. International Journal for Numerical Methods in Fluids, 61(12), 1388-1410. DOI: 10.1002/fld.2003.

    4. Jablonskб, M., Kozubkovб, D., Himr. (2016). Methods of Experimental Investigation of Cavitation in a Convergent - Divergent Nozzle of Rectangular Cross Section. Measurement science review, 16(4), 197– 204.

    5. Luo, J., Xu, W.L., Niu, Z.P., Luo, S.J., Zheng, Q.W. (2013). Experimental study of the interaction between the spark-induced cavitation bubble and the air bubble. Journal of Hydrodynamics, Ser. B, 25(6), 895–902.

    6. Bilus, I., Bombek, G., Hočevar, M., Sirok, B., Cencic, T., & Petkovsek, M. (2014). The experimental analysis of cavitating structure fluctuations and pressure pulsations in the cavitation station. Journal of Mechanical Engineering 60(3), 147–157. DOI: 10.5545/sv-jme.2013.1462.

    7. Sou, A., Hosokawa, S., & Tomiyama, A. (2007). Effects of cavitation in a nozzle on liquid jet atomization. International Journal of Heat and Mass Transfer, 50 (17), 3575–3582.

    8. Yan, Z., Liu, J., Chen, B., Cheng, X., & Yang, J. (2015). Fluid cavitation detection method with phase demodulation of ultrasonic signal. Applied Acoustics, 87, 198–204.

    9. Ozonek, J., & Lenik, K. (2011). Effect of different design features of the reactor on hydrodynamic cavitation process. Wroclaw, Poland. International OCSCO World Press, 52 (2), 112–117.

    10. Margot, X., Hoyas, S., Gil, A., & Patouna, S. (2012). Numerical modeling of cavitation: validation and parametric studies. Engineering Applications of Computational Fluid Mechanics, 6(1), 15–24.

    11. Fuchs, M., von Dirke, M., Macdonald, M., & Waidmann, W. (2011). Numerical RANS simulation of cavitation in throttles – approaches and first results. 56-th international scientific colloquium Ulmenau University of Technology.

    12. Lomakin, V.O., Kuleshova, M.S., & Kraeva, E.A. (2015). Fluid flow in the throttle channel in the presence of cavitation. Dynamics and Vibroacoustics of Machines. Procedia Engineering, 106, 27–35.

    13. Menter, F. (2002). CFD Best Practice Guidelines for CFD Code Validation for Reactor-Safety Applica- tions, EVOL-ECORA-D01, 46 p.

    14. Shur, M.L., Spalart, P.R., Strelets, M., & Travin, A. (2008). A Hybrid RANS-LES Approach with De- layed-DES and Wall-Modeled LES Capabilities. Int. J. Heat Fluid Flow International Journal of Heat and Fluid Flow, 29 (6), 1638–1649.

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