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Publication Title | METHODS FOR DESIGN OF RADIAL-AXIAL TURBINES FOR ORC COGENERATION UNIT WORKING WITH MDM

Organic Rankine Cycle

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ЕНЕРГЕТИЧНІ ТА ТЕПЛОТЕХНІЧНІ ПРОЦЕСИ Й УСТАТКУВАННЯ

UDC 621.165:532.6

P. KLONOWICZ, PhD., R Associate at IFFM PAS, Gdansk;

R. RUSANOV, at IFFM PAS, Gdansk;

A. RUSANOV, D.Sc., Prof., Deputy Director for Science at IPMach NASU, Kharkov; P. LAMPART, D.Sc., Assoc. Prof., Head of the Centre of Heat and Power Engineering at IFFM PAS, Gdansk;

T. K. SUCHOCKI, , R Assistant at IFFM PAS, Gdansk;

J. SURWILO, , R Assistant at IFFM PAS, Gdansk

METHODS FOR DESIGN OF RADIAL-AXIAL TURBINES FOR ORC COGENERATION UNIT WORKING WITH MDM

The paper describes two methods of design of blading systems of radial-axial turbines for an Organic Rankine Cycle (ORC) cogeneration unit working with silica oil MDM. Preliminary design of the turbine flow part draws on methods of 1D calculation and pre-selection of basic geometric characteristics. Final design involves also methods for construction of 3D geometry and methods of 3D flow calculations of the turbine flow part. 3D numerical calculations of turbine flows are made with the help of the software package IPMFlow, developed based on the earlier codes FlowER and FlowER-U, or using the software complex ANSYS. 100 kW ORC turbine designs with the single-stage radial-axial turbine are elaborated in this paper.

Key words: cogeneration unit, Organic Ranking Cycle, CFD, radial-axial turbine

Introduction

A promising direction in the development of energy saving technologies is the use of low-power cogeneration plants working on low-boiling working fluids. Such plants can be used for disposal of low-temperature thermal waste and for work on renewable fuels such as different types of biomass.

An important element of the ORC cogeneration plant is turbine. The peculiarity of low-power ORC turbines, that is its relatively small size, makes a non-trivial task to achieve an acceptable level of gas-dynamic perfection.

Centripetal turbines are widely used whenever a compact design is required, for example in turbocompressors. This type of stage is characterized by a relatively high efficiency and can process relatively large enthalpy drops. A highly loaded stage, especially for large particle fluids like MDM, can process pressure ratios over 100 and according to some authors even up to 400 [1]. For this reason they are attractive from the point of view of microcogeneration, when an ORC system is used [2].

The paper describes two methods of turbine design, the first method was developed at the Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences (IFFM PAS) in Gdansk, the second – at the A.N. Podgorny Institute for Mechanical Engineering Problems of National Academy of Sciences of Ukraine (IPMach NASU) in Kharkov. In the first method the software package ANSYS is used for the numerical investigation of viscous flow in turbines A 3D turbulent flow model for the second method is realised in the program complex IPMFlow, which originates from the programs FlowER and FlowER-U. Also, examples of designs of flow parts of the radial-axial type turbines using these methods are presented.

© P. Klonowicz, R. Rusanov, A. Rusanov, P. Lampart, T.K. Suchocki, J. Surwilo, 2015

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ISSN 2078-774X. Вісник НТУ «ХПІ». 2015. No 16(1125) 67

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