Skip to main content
SpringerLink
Log in

Numerically Simulating the Formation and Motion of Water Films and Erosion-Hazardous Droplets in Flow-Through Parts of Steam Turbines

  • STEAM-TURBINE, GAS-TURBINE, STEAM-GAS PLANTS AND THEIR AUXILIARY EQUIPMENT
  • Published:
Thermal Engineering Aims and scope Submit manuscript

Abstract

A model for the process of coarse liquid particle formation in the flow-through parts of steam turbines is considered. A numerical approach is proposed to describe the formation and development of a water film on the surface of the interblade channels, and the main factors affecting the distribution of the film parameters along the curvilinear walls of the blades are presented. It is assumed that the only source of the water film is represented by liquid-phase particles deposited on the blade surfaces. The process of film detachment from the exit edge of the blade together with its subsequent destruction and the formation of large erosion-hazardous droplets is considered. The developed model has been integrated into the earlier proposed numerical approach to the description of the motion of liquid-phase particles and their interaction with solid surfaces. At the same time, an amendment has been introduced therein taking into account the presence of a water film when a liquid phase particle collides with a solid wall. The developed numerical method makes it possible to describe all the main gas-dynamic processes occurring in the course of motion for erosion-hazardous droplets in the interblade channels. This method has been tested using experimental studies on streaming wet-steam flow in a flat nozzle grating at different initial humidity of the working medium. Using the laser flux diagnostics system, velocities and sizes inherent in droplets beyond the grating along its spacing have been determined. The developed model provides a good agreement of these parameters with the experimental data in the places of the maximum concentration of coarse droplets. However, there is a significant discrepancy for some areas of the flow in the obtained results concerning the velocity distribution. The effect that the initial steam moisture exert on the characteristics of the water film on the blade surface is considered. It is established that the film thickness significantly affects the interaction between the droplets and the blade surface in the areas wherein the collision energy is small. These areas are characterized by a large angle between the velocity vector of the projectile droplet and that normal to the surface at the collision site.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
Fig. 7.
Fig. 8.

Similar content being viewed by others

REFERENCES

  1. M. E. Deich, “Some problems of efficiency and reliability of wet steam turbines,” Izv. Akad. Nauk SSSR. Energ. Transp., No. 1, 56–74 (1984).

  2. J. Young, K. K. Yau, and P. T. Walters, “Fog droplet deposition and coarse water formation in low-pressure steam turbines: A combined experimental and theoretical analysis,” J. Turbomach. 110, 163–172 (1988).

    Article  Google Scholar 

  3. G. A. Filippov, R. Nekker, and L. I. Seleznev, “To calculations of the occurrence of moisture in the flow parts of turbines,” Teploenergetika, No. 7, 9–14 (1977).

    Google Scholar 

  4. M. Hoznedl, L. Tajc, and L. Bednar, “Separation of the liquid phase from the stator blades of the last stage of a steam turbine,” in Proc. of Baumann Centenary Wet Steam Conf. Cambridge, 10–11 Sept. 2012.

  5. V. G. Gribin, A. A. Tishchenko, V. A. Tishchenko, I. Y. Gavrilov, I. Y. Sorokin, and R. A. Alexeev, “Experimental study of the features of the motion of liquid-phase particles in the interblade channel of the nozzle array of a steam turbine,” Power Tech. Eng. 51, 82–88 (2017).

    Article  Google Scholar 

  6. V. Gribin, I. Gavrilov, A. Tishchenko, V. Tishchenko, V. Popov, S. Khomyakov, and R. Alexeev, “Features of liquid phase movement in the inter-blade channel of nozzle blade cascade,” in Proc. IMechE Part A: J. Power Energy 232, 452–460 (2018).

    Article  Google Scholar 

  7. V. A. Tishchenko, R. A. Alekseev, and I. Yu. Gavrilov, “A model of the motion of erosion-hazardous droplets in steam turbines’ interblade channels,” Therm. Eng. 65, 885–892 (2018). https://doi.org/10.1134/S0040601518120108

    Article  Google Scholar 

  8. G. A. Filippov and O. A. Povarov, Moisture Separation in NPP Turbines (Energiya, Moscow, 1980) [in Russian].

    Google Scholar 

  9. S. Amelie, M. Meryem, H. Jean-Marc, D. Jean-Marc, and L. Michel, “A model for liquid films in steam turbines and preliminary validations,” in Proc. ASME Turbo Expo 2016: Turbomachinery Technical Conf. and Expo. (GT2016), Seoul, South Korea, June 13–17, 2016 (ASME, New York, 2016).

  10. A. Simon, J. M. Dorey, and M. Lance, “Development of a model for thin films and numerical sensitivity tests,” Proc. IMechE Part A: J. Power Energy. 232, 525–535 (2018).

    Article  Google Scholar 

  11. V. Petr and M. Kolovratnik, “Wet steam energy loss and related Baumann rule in low pressure steam turbines,” Proc. IMechE part A: J. Power Energy. 228, 206–215 (2014).

    Article  Google Scholar 

  12. J. A. Diez and L. Kondic, “Computing three-dimensional thin film flows including contact lines,” J. Comput. Phys., No. 183, 274–306 (2002).

  13. M. E. Deich and G. A. Filippov, Gas Dynamics of Two-Phase Media (Energoizdat, Moscow, 1981).

    Google Scholar 

  14. M. Trela, “A semi-theoretical model of stability of vertical falling liquid film,” Chem. Eng. Sci. 49, 1007–1013 (1994).

    Article  Google Scholar 

  15. H. Foucart, C. Habchi, J. Le Coz, and T. Baritaud, “Development of a three dimensional model of wall fuel liquid film for internal combustion engines,” SAE Technical Paper. No. 980133 (SAE Int., 1998).

  16. M. E. Deich, Gas Dynamics of Turbomachine Grids (Energoatomizdat, Moscow, 1996) [in Russian].

    Google Scholar 

  17. M. A. Friedrich, H. Lan, J. L. Wegner, J. A. Drallmeier, and B. F. Armaly, “A separation criterion with experimental validation for shear-driven films in separated flows,” J. Fluids Eng. 130, 051301 (2008).

    Article  Google Scholar 

  18. I. I. Kirillov, “Fragmentation of moisture films from the edges of nozzle blades of steam turbines,” Inzh.-Fiz. Zh. 15 (1), 85–90 (1968).

    Google Scholar 

  19. V. A. Tishchenko, Development and Implementation of Methods for Determining the Parameters of the Liquid Phase of a Wet-Steam Flow in the Elements of the Flow Parts of Turbomachines, Candidate’s Dissertation in Engineering (Moscow, 2014).

  20. M. Pilch and C. A. Erdman, “Use of breakup time data and velocity history to predict the maximum size of stable fragments for acceleration-induced breakup of liquid drops,” Int. J. Multiphase Flow. 13, 741–757 (1987).

    Article  Google Scholar 

  21. L. P. Hsiang and G. M. Faeth, “Near-limit drop deformation and secondary breakup,” Int. J. Multiphase Flow. 18, 635–652 (1992).

    Article  Google Scholar 

  22. Z. Han, Z. Xu, and N. Trigui, “Spray/wall interaction models for multidimensional engine simulation,” Int. J. Engine Res. 1, 127–146 (2000).

    Article  Google Scholar 

  23. I. Yu. Gavrilov, V. V. Popov, I. Yu. Sorokin, V. A. Tishchenko, and S. V. Khomyakov, “A contactless technique for determining the average sizes of erosion-hazardous droplets in polydisperse wet steam flow,” Therm. Eng. 61, 577–584 (2014). https://doi.org/10.1134/S0040601514080072

    Article  Google Scholar 

  24. V. Tishchenko and R. Alekseev, “Numerical modeling of the mechanism of coarse droplets deposition on surfaces of a steam turbine nozzle blade cascade,” J. Phys.: Conf. Ser., No. 1128, 012137 (2018).

Download references

Funding

The work was financially supported by the Russian Science Foundation (project no. 17-79-10180).

Author information

Authors and Affiliations

  1. National Research University Moscow Power Engineering Institute (NRU MPEI), 111250, Moscow, Russia

    V. A. Tishchenko & R. A. Alekseev

Authors
  1. V. A. Tishchenko
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. R. A. Alekseev
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to V. A. Tishchenko.

Additional information

Translated by O. Polyakov

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Tishchenko, V.A., Alekseev, R.A. Numerically Simulating the Formation and Motion of Water Films and Erosion-Hazardous Droplets in Flow-Through Parts of Steam Turbines. Therm. Eng. 66, 830–838 (2019). https://doi.org/10.1134/S0040601519110053

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0040601519110053

Keywords:

Search

Navigation