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Unsteady Flow Field and Coarse Droplet Measurements in the Last Stage of a Low Pressure Steam Turbine with Supersonic Airfoils Near the Blade Tip

[+] Author and Article Information
Ilias Bosdas

Laboratory for Energy Conversion, Department of Mechanical and Process Engineering, ETH Zurich, Switzerland
bosdas@lec.mavt.ethz.ch

Michel Mansour

Laboratory for Energy Conversion, Department of Mechanical and Process Engineering, ETH Zurich, Switzerland
michel.mansour@lec.mavt.ethz.ch

Anestis I. Kalfas

Department of Mechanical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
akalfas@auth.gr

Reza S. Abhari

Laboratory for Energy Conversion, Department of Mechanical and Process Engineering, ETH Zurich, Switzerland
rabhari@lec.mavt.ethz.ch

Shigeki Senoo

Mitsubishi Hitachi Power Systems, Ltd, 3-1-1, Saiwai, Hitachi, Ibaraki, 317-0073 Japan
shigeki1_senoo@mhps.com

1Corresponding author.

ASME doi:10.1115/1.4036011 History: Received July 26, 2016; Revised February 15, 2017

Abstract

The largest share of electricity production worldwide belongs to steam turbines. However, the increase of renewable energy production has led steam turbines to operate under part load conditions and increase in size. As a consequence long rotor blades will generate a relative supersonic flow field at the inlet of the last rotor. This paper presents a unique experiment work that focuses at the top 30% of stator exit in the last stage of an LP steam turbine test facility with coarse droplets and high wetness mass fraction under different operating conditions. The measurements were performed with two novel fast response probes. A fast response probe for three dimensional flow field wet steam measurements and an optical backscatter probe for coarse water droplet measurements ranging from 30 up to 110µm in diameter. This study has shown that the attached bow shock at the rotor leading edge is the main source of inter blade row interactions between the stator and rotor of the last stage. In addition, the measurements showed that coarse droplets are present in the entire stator pitch with larger droplets located at the vicinity of the stator's suction side. Unsteady droplet measurements showed that the coarse water droplets are modulated with the downstream rotor blade-passing period. This set of time-resolved data will be used for in-house CFD code development and validation.

Copyright (c) 2017 by ASME
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