Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Preliminary Design of a Centrifugal Turbine for Organic Rankine Cycle Applications

[+] Author and Article Information
Matteo Pini

e-mail: matteo.pini@mail.polimi.it

Giacomo Persico

Assistant Professor
e-mail: giacomo.persico@polimi.it
Laboratorio di Fluidodinamica delle Macchine,
Dipartimento di Energia,
Politecnico di Milano,
via Lambruschini 4,
20156 Milano, Italy

Emiliano Casati

Process and Energy Department,
2628 Delft, The Netherlands;
Laboratorio di Fluidodinamica delle Macchine,
Dipartimento di Energia,
Politecnico di Milano,
via Lambruschini 4,
20156 Milano, Italy
e-mail: E.I.M.Casati@tudelft.nl

Vincenzo Dossena

Associate Professor
Laboratorio di Fluidodinamica delle Macchine,
Dipartimento di Energia,
Politecnico di Milano,
via Lambruschini 4,
20156 Milano, Italy
e-mail: vincenzo.dossena@polimi.it

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received February 29, 2012; final manuscript received September 18, 2012; published online March 18, 2013. Assoc. Editor: Joost J. Brasz.

J. Eng. Gas Turbines Power 135(4), 042312 (Mar 18, 2013) (9 pages) Paper No: GTP-12-1066; doi: 10.1115/1.4023122 History: Received February 29, 2012; Revised September 18, 2012

Organic rankine cycles (ORC) are renowned to be attractive energy conversion systems for the thermal energy sources in the small-to-medium power range. A critical component in the ORC technology is the turbo-expander; the difficulties involved in the accurate thermodynamic modeling of organic fluids and, especially, the complex gasdynamic phenomena that are commonly found in ORC turbines may result in relatively low efficiency and in performance reduction at partial loads. In this perspective, a relevant path of development can be outlined in the evaluation of nonconventional turbine architectures, such as the radial-outward or centrifugal turbine. In the present work, a critical evaluation of the feasibility of multistage transonic centrifugal turbines for ORC systems is presented. To support this study, a two-step design procedure, specifically oriented to ORC turbines, was developed. The methodology includes a 1D mean-line code coupled to an external optimizer to perform a preliminary design of the machine. The selected configurations are then verified with a CFD (computational fluid dynamics)-based throughflow solver, able to deal with any flow regime and to treat fluids described by arbitrary equations of state. The overall procedure is applied to the design of two different turbines of the same target power of about 1 MW, the former representing a transonic six-stage turbine and the latter a supersonic three-stage turbine. The two machines are characterized by very different shape and comparable performances. The results are extensively discussed in terms of both overall data and detailed flow fields.

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Obernberger, I., Carlsen, H., and Biedermann, F., 2003, “State-Of-The-Art and Future Developments Regarding Small-Scale Biomass CHP Systems With a Special Focus on ORC and Stirling Engines Technologies,” Proceedings of the International Nordic Bioenergy Conference, Jyväskylä, Finland, September 2–5.
Prabhu, E., 2006, “Solar Trough Organic Rankine Electricity System (Stores). Stage 1. Power Plant Optimization and Economics,” National Renewable Energy Laboratory (US), Technical Report No. NREL/SR-550-39433.
Verneau, A., 1978, “Emploi des fluids organiques dans les turbines solaires (The Use of Organic Fluids in the Solar Turbines),” Entropie, 82, pp. 9–18.
Angelino, G., Gaia, M., and Macchi, E., 1984, “A Review of Italian Activity in the Field of Organic Rankine Cycles,” International VDI-Seminar (ORC-HP-Technology, Working Fluid Problems), Zürich, Switzerland, September 10–12, pp. 465–482.
Tabor, H., and Bronicki, L., 1964, “Establishing Criteria for Fluids for Small Vapor Turbines,” SAE National Transportation, Powerplant, and Fuels and Lubricants Meeting, Baltimore, MD, October 19–23.
Colonna, P., Guardone, A., Nannan, N. R., and Zamfirescu, C., 2008, “Design of the Dense Gas Flexible Asymmetric Shock Tube,” ASME J. Fluids Eng., 130, p. 034501. [CrossRef]
Spinelli, A., Dossena, V., Gaetani, P., Osnaghi, C., and Colombo, D., 2010, “Design of a Test Rig for Organic Vapours,” Proceedings of the ASME Turbo Expo (GT2010), Glasgow, UK, June 14–18, ASME Paper No. GT2010-22959. [CrossRef]
Macchi, E., 1977, “Design Criteria for Turbines Operating With Fluids Having a Low Speed of Sound,” Lecture Series 100 on Closed-Cycle Gas Turbines, Von Karman Institute for Fluid Dynamics, Rhode-Saint-Genèse, Belgium.
Macchi, E., and Perdichizzi, A., 1981, “Efficiency Prediction for Axial Flow Turbines Operating With Non-Conventional Working Fluids,” ASME J. Eng. Power, 103, pp. 712–724. [CrossRef]
Verneau, A., 1987, “Small High Pressure Ratio Turbines. Supersonic Turbines for Organic Rankine Cycles From 3 to 1300 kW,” Lecture Series 1987–07, Von Karman Institute for Fluid Dynamics, Rhode-Saint-Genèse, Belgium.
Hoffren, J., Talonpoika, T., Larjola, J., and Siikonen, T., 2002, “Numerical Simulation of Real-Gas Flow in a Supersonic Turbine Nozzle Ring,” ASME J. Eng. Gas Turbines Power, 124, pp. 395–403. [CrossRef]
Sauret, E., and Rowlands, A. S., 2011, “Candidate Radial-Inflow Turbines and High-Density Working Fluids for Geothermal Power Systems,” Energy, 36(7), pp. 4460–4467. [CrossRef]
Lozza, G., Macchi, E., and Perdichizzi, A., 1986, “Investigation on the Efficiency Potential of Small Steam Turbines of Various Configurations,” ACS, Washington, DC, pp. 1367–1373.
Wilson, D., 1984, The Design of High-Efficiency Turbomachinery and Gas Turbines, MIT Press, Cambridge, MA.
Ljungstrom, F., 1949, “The Development of the Ljungstrom Steam Turbine and Air Preheater,” Proc. Inst. Mech. Eng., 160, pp. 211–223. [CrossRef]
Dixon, S. L., and Hall, C. A., 2010, Fluid Mechanics and Thermodynamics of Turbomachinery, Elsevier, New York.
Lewis, R., 1996, Turbomachinery Performance Analysis, Arnold, London.
Persico, G., and Rebay, S., 2012, “A Penalty Formulation for the Throughflow Modeling of Turbomachinery,” Comput. Fluids, 60, pp. 86–98. [CrossRef]
Horlock, J. H., 1971, “On Entropy Production in Adiabatic Flow in Turbomachines,” ASME J. Basic Eng., 93, pp. 587–593. [CrossRef]
Craig, H. R. M., and Cox, H. J. A., 1971, “Performance Estimation of Axial Flow Turbines,” Proc. Inst. Mech. Eng., 185, pp. 407–424.
Persico, G., Rebay, S., and Osnaghi, C., 2011, “A Novel Package for Turbomachinery Throughflow Analysis,” Proceeding of the 9th European Turbomachinery Conference, Istanbul, Turkey, March 21–25.
Gaetani, P., Persico, G., and Osnaghi, C., 2010, “Effects of Axial Gap on the Vane-Rotor Interaction in a Low Aspect Ratio Turbine Stage,” J. Propul. Power, 26(2), pp. 325–334. [CrossRef]
Giles, M. B., 1990, “Stator/Rotor Interaction in a Transonic Turbine,” J. Propul. Power, 6(5), pp. 621–627. [CrossRef]


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Fig. 2

Meridional section of the optimized configurations

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Fig. 1

T-s diagram for the expansion process

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Fig. 3

3D blade arrangement of the optimized configurations

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Fig. 4

Absolute and relative Mach number, total enthalpy, and entropy axisymmetric field for the six-stage turbine

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Fig. 5

Absolute and relative Mach number, total enthalpy, and entropy axisymmetric field for the three-stage turbine



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