0
Research Papers: Multiphase Flows

Numerical and Experimental Investigations of Steam Condensation in LP Part of a Large Power Turbine

[+] Author and Article Information
Włodzimierz Wróblewski

Institute of Power Engineering and Turbomachinery, Silesian University of Technology, Gliwice, Polandwlodzimierz.wroblewski@polsl.pl

Sławomir Dykas

Institute of Power Engineering and Turbomachinery, Silesian University of Technology, Gliwice, Poland

Andrzej Gardzilewicz

Institute of Fluid-Flow Machinery, Polish Academy of Science, Gdansk, Polandgar@imp.gda.pl

Michal Kolovratnik

 Czech Technical University in Prague (CTU), Prague, Czech Republickolovrat@fsid.cvut.cz

J. Fluids Eng 131(4), 041301 (Mar 09, 2009) (11 pages) doi:10.1115/1.3089544 History: Received October 30, 2007; Revised October 06, 2008; Published March 09, 2009

This paper presents the experimental investigations of steam flow with condensation in the blading system of the low-pressure (LP) part of a 360 MW turbine. To this end, special probes were used, which provided flow visualization opportunities including localization of the front of condensation, determining distributions of pressure, temperature, velocity, and flow angle in the inter-row gaps, measurements of water droplet concentration and sizes. The measurements have proved that the condensation process in the LP turbine might be of heterogeneous nature, depending on the concentration of chemical impurities in steam. The measurement results constituted the basis for computational fluid dynamics (CFD) flow calculations, which were performed using the time-dependent 3D Reynolds averaged Navier–Stokes equations coupled with two-equation turbulence model (k-ω SST) and additional conservation equations for the liquid phase. The set of governing equations has been closed by a “local” real gas equation of state. The condensation phenomena were modeled on the basis of the classical nucleation theory. The heterogeneous condensation model on the insoluble and soluble impurities was implemented into presented CFD code. The system of governing equations was solved by means of a finite volume method on a multiblock structured grid. The obtained numerical results and experimental data were compared and discussed.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Location of probes in the blade system of a 360 MW turbine LP part of Belchatow Power Plant: meridional section (a), cross section (b), and photo of measurement stand (c)

Grahic Jump Location
Figure 2

Plate probe for thermal and flow measurements (a) including the optical system (b)

Grahic Jump Location
Figure 3

Measurement radial parameters at the inlet fourth stage (a) and behind the last stage (b). Circumferential static pressure at the root stage behind the turbine (c).

Grahic Jump Location
Figure 4

Expansion lines in LP part of a 360 MW turbine

Grahic Jump Location
Figure 5

Measuring system of CTU extinction probe (a) and head of extinction probe (b)

Grahic Jump Location
Figure 6

Variation in transmittance measured at the blade midspan behind the L-0, L-1, and L-2 stages

Grahic Jump Location
Figure 7

Static pressure and flow angle distributions: (a) between the last two stages and (b) at the outlet

Grahic Jump Location
Figure 8

Wetness fraction at the midspan section: (a) homogeneous, (b) homoheterogeneous, and (c) heterogeneous condensations

Grahic Jump Location
Figure 9

Wetness fraction distributions: (a) between the last two stages and (b) at the outlet

Grahic Jump Location
Figure 10

Flow angle and static pressure distribution: (a) between the last two stages and (b) at the outlet

Grahic Jump Location
Figure 11

Wetness fraction contours at midspan section: global wetness fraction contours (homogeneous and heterogeneous) (a) and wetness fraction contours generated only due to the heterogeneous condensation (b)

Grahic Jump Location
Figure 12

Wetness fraction and mean droplet Sauter diameter: (a) between the last two stages and (b) at the outlet

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In