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Thermal Engineering

, Volume 64, Issue 5, pp 379–386 | Cite as

Wave structure and flow amplitude-frequency characteristics in the turbine nozzle lattice in the presence of phase transition

  • V. G. Gribin
  • I. Yu. Gavrilov
  • A. A. Tishchenko
  • V. A. Tishchenko
  • R. A. Alekseev
Steam Turbine, Gas Turbine, Steam-Gas Plants and Accessory Equipment
  • 24 Downloads

Abstract

This paper is devoted to the wave structure of a flow at its near- and supersonic velocities in a flat turbine cascade of profiles in the zone of phase transitions. The main task was investigation of the mechanics of interaction of the condensation jump with the adiabatic jumps of packing in a change of the initial condition of the flow. The obtained results are necessary for verification of the calculation models of the moisture-steam flow in the elements of lotic parts of the steam turbines. The experimental tests were made on a stand of the wet steam contour (WSC-2) in the Moscow Power Engineering Institute (MPEI, National Research University) at various initial states of steam in a wide range of Mach numbers. In the investigation of the wave structure, use was made of an instrument based on the Schlieren-method principle. The amplitude-frequency characteristics of the flow was found by measurement of static pressure pulsations by means of the piezo resistive sensors established on a bandage plate along the bevel cut of the cascade. It is shown that appearance of phase transitions in the bevel cut of the nozzle turbine cascade leads to a change in the wave structure of the flow. In case of condensation jump, the system of adiabatic jumps in the bevel cut of the cascade becomes nonstationary, and the amplitude-frequency characteristics of static pressure pulsations are restructured. In this, a change in the frequency pulsations of pressure and amplitude takes place. It is noted that, at near-sonic speeds of the flow and the state of saturation at the input, the low-frequency pulsations of static pressure appear that lead to periodic disappearance of the condensation jump and of the adiabatic jump. As a result, in this mode, the flow discharge variations take place.

Keywords

steam turbine supersonic flows phase transitions pressure pulsations 

References

  1. 1.
    M. Grübel, J. Starzmann, M. Schatz, T. Eberle, D. M. Vogt, and F. Sieverding, “Two-phase flow modeling and measurements in low-pressure turbines. Part 1 — Numerical validation of wet steam models and turbine modeling,” in Proc. ASME Turbo Expo 2014: Turbine Technical Conf. and Exposition (GT2014), Dusseldorf, June 16–20, 2014 (Am. Soc. Mech. Eng., 2014), Vol. 1B, paper no. GT2014-25244.Google Scholar
  2. 2.
    F. Bakhtar and K. Zidi, “Nucleation phenomena in flowing high-pressure steam: Experimental results,” Proc. Inst. Mech. Eng., Part A 203, 195–200 (1989).CrossRefGoogle Scholar
  3. 3.
    M. J. Moore, P. T. Walters, R. I. Crane, and B. J. Davidson, “Predicting the fog-drop size in wetsteam turbines,” in Proc. 4th Conf. on Wet Steam, Coventry, UK, Apr. 3–5, 1973 (Mech. Eng. Publ. Inst. Mech. Eng., London, 1973).Google Scholar
  4. 4.
    C. A. Moses and G. D. Stein, “On the growth of steam droplets formed in a laval nozzle using both static pressure and light scattering measurements,” Trans. ASME, Ser. I: J. Fluids Eng. 100, 311–322 (1978).CrossRefGoogle Scholar
  5. 5.
    S. Shigeki and J. Alexander, “White non-equilibrium unsteady wet-steam condensation modeling: computations for a steam turbine cascade and a nozzle,” in Proc. Baumann Centenary Conf., Cambridge, Sept. 10–11, 2012 (Univ. of Cambridge, Cambridge, 2012), paper No. BCC-2012-07.Google Scholar
  6. 6.
    S. Dykas, M. Majkut, and M. Strozik, “Non-equilibrium spontaneous condensation in transonic steam flow through linear cascade,” in Proc. 11th European Conf. on Turbomachinery Fluid Dynamics and Thermodynamics, Madrid, Mar. 23–27, 2015 (Von Karman Inst. for Fluid Dynamics, Rhode-St-Genèse, 2015), paper No. ETC2015-047.Google Scholar
  7. 7.
    O. Z. Emets, “Analysis of gas-dynamic flow structure and disturbing forces nature in the turbine K-1000-60/3000 rotor blades of low-pressure cylinder’s (LPC) last stage,” Zb. Nauk. Prats’ Sevastop. Nats. Univ. Yad. Energ. Promisl., No. 4, 23–29 (2013).Google Scholar
  8. 8.
    M. E. Deich, Gas Dynamics of Turbomachine Arrays (Energoatomizdat, Moscow, 1996) [in Russian].Google Scholar
  9. 9.
    V. Gribin, A. Tishchenko, and I. Gavrilov, “Experimental studies of supersonic steamflow in the flat nozzle blade cascade at different initial steam conditions,” in Proc. ASME Turbo Expo 2014: Turbine Technical Conf. and Exposition (GT2014), Dusseldorf, June 16–20, 2014 (Am. Soc. Mech. Eng., 2014), Vol. 1B, paper No. GT2014-26209.Google Scholar
  10. 10.
    M. E. Deich, A. V. Kurshakov, and V. M. Leonov, “Pulsation characteristics of the condensation process in vortex trails,” Izv. Akad. Nauk SSSR, Energ. Transp., No. 1, 93–105 (1985).Google Scholar
  11. 11.
    M. E. Deich, A. V. Kurshakov, and V. M. Leonov, “Condensation unsteadiness in nozzle arrays with tapered channels,” Izv. Akad. Nauk SSSR, Energ. Transp., No. 3, 47–61 (1986).Google Scholar
  12. 12.
    M. E. Deich and G. A. Filippov, Two-Phase Flows in Elements of Thermal Engineering Equipment (Energoatomizdat, Moscow, 1987) [in Russian].Google Scholar

Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • V. G. Gribin
    • 1
  • I. Yu. Gavrilov
    • 1
  • A. A. Tishchenko
    • 1
  • V. A. Tishchenko
    • 1
  • R. A. Alekseev
    • 1
  1. 1.Moscow Power Engineering Institute (MPEI, National Research University)MoscowRussia

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