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1

Adjustable (rotated) stator blade aerodynamics in adaptive control of extraction/condensing turbines

Lampart P.

Transactions of the Institute of Fluid-Flow Machinery

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2018

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nr 141

41--52

EN

Cogeneration of electric energy and heat as well as seasonal changes of the condenser pressure in low-pressure extraction/condensing turbines require adaptive control to adapt the geometry of the blading system to the changing ﬂow conditions. In this paper adaptive control is achieved by means of restaggering (rotating) adjustable stator blades. An increase of turbine eﬃciency and power coming from adaptive control is numerically estimated for a group of two exit stages of an extraction/condensing turbine of power 60 MW. The calculations are made with the help of a computer code FlowER – a 3D solver of turbomachinery ﬂows based on Reynolds-averaged Navier-Stokes equations for perfect gas.

2

Optimization of Tip Seal with Honeycomb Land in LP Counter Rotating Gas Turbine Engine

Wróblewski W., Dykas S., Bochon K., Rulik S.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2010

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Vol. 14, No 3

189-207

EN

The goal of the presented work is an optimization of the geometrical configuration of the tip seal with a honeycomb land, to reduce the leakage flow in the counter-rotating LP turbine of a contra-rotating open rotor aero-engine. This goal was achieved with the use of the Ansys-CFX commercial code and an in-house optimization procedure. The detailed studies including the mesh influence, the stages of the computational domain simplification, and geometry variants are discussed. The optimization process is based on a single objective genetic algorithm (SOGA). The automatic grid generation process and the CFD calculations are based on scripts prepared under the Ansys-ICEM and Ansys-CFX software. The whole procedure is written in the Visual Basic for Applications language (VBA), which allows a direct access to the CAD software with the use of macros and allows a proper connection between the CAD environment and the CFD software. The described algorithm allows parallel computing. In addition to the optimization studies, a sensitivity analysis was also performed. For this purpose, the Elementary Effects Method (EEM) was used. This paper was written within the DREAM European project (Validation of Radical Engine Architecture Systems) of the 7th Framework Program of the European Union.

3

Investigation of wet steam flow in LP steam turbine using a novel integrated probe: experimental results

Wang L., Cai X., Ouyang X.

Archives of Thermodynamics

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2002

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Vol. 23, no 4

49-57

EN

In low-pressure (LP) steam turbine, the wetness fraction of steam causes dangerous erosion of turbine blades and decrease of turbine efficiency. In the study of wet steam flow, wetness, droplet size and velocity are of the main concern. These parameters are closely correlated to the vapour phase of the flow field and have to be measured simultaneously. Following this line, a novel integrated probe system has been successfully developed, based on light scattering technique, correlation theory and common methods for flow field measurement. By using this system, experiment has been performed in a 200 MW and a 350 MW condensing steam turbine. Part of the results are presented and some newly detected phenomena are put forward and discussed.