F4 - Steam turbines


Organizer: T. Turunen-Saaresti

Teemu Turunen-Saaresti is working as an Academy Research Fellow at Lappeenranta University of Technology. He and his research group are studying the effects of the turbulence and condensation in a turbomachinery mainly steam turbines. He is also active in research of the centrifugal compressors and Organic Rankine Cycle (ORC).



Contacts:
teemu.turunen-saaresti@lut.fi

Steam turbines play a vital role in the electricity generation as well as mechanical drives worldwide. Therefore, the improvements in the efficiency and safe operating range of steam turbines are important in order to achieve energy efficient usage of primary energy sources such as biomass, solar, geothermal, gas, oil, coal or nuclear. In most power stations the steam supplied to the steam turbine is superheated but as the expansion continues, wet expansion and condensation occurs in last stages of the turbine. The condensation and subsequent formation of liquid phase generate losses and potential damage to the components due to erosion. The expansion is therefore usually restricted to certain wetness level. The condensing flow is also affecting the thermodynamic, aerodynamic and last but not least the aeroelastic behaviour of the turbine. The challenges are further enhanced due to the fact that steam turbines are increasingly operated at off-design conditions due to the increased share of fluctuating energy sources (e.g. wind energy, photovoltaics) in electricity grids. Therefore, it is essential to understand the various aspects of steam turbine operation in order to design energy efficient, reliable and affordable turbines.
The steam turbine Forum/Session of the ISROMAC16 conference is targeted to introducing the latest developments in the design and the analysis of steam turbines. The forum topics include advances in measurement techniques, experimental facilities ranging from component rigs (nozzles, cascades, model turbines) to large-scale facilities and advances in numerical techniques covering both aero-thermodynamic aspects (e.g. wet steam modelling, turbulence modelling) and aeroelastic aspects.

Non-exhaustive list of suggested Topics:

- Experimental research on wet steam flow

- Measurements of steam properties

- Developments in the nucleation and droplet growth models

- Homogenous and heterogeneous nucleation

- Effects of turbulence

- Corrosion and erosion

- Thermodynamical losses

- Loss correlations

- Analysis of operation

- Flutter and forced response

- Diffuser flows

- Extreme off-design operation

- Load cycling of steam turbines