0
Research Papers

Numerical Investigation on the Performance of a Regenerative Flow Turbine for Small-Scale Organic Rankine Cycle Systems

[+] Author and Article Information
Ramin Moradi

Dipartimento di Ingegneria Astronautica,
Elettrica ed Energetica,
Sapienza Università di Roma,
Via Eudossiana 18,
Rome 00184, Italy
e-mail: ramin.moradi@uniroma1.it

Luca Cioccolanti

Centro di Ricerca su Energia, Ambiente e
Territorio,
Università Telematica eCampus,
Via Isimbardi 10,
Novedrate, CO 22060, Italy
e-mail: luca.cioccolanti@uniecampus.it

Enrico Bocci

Dipartimento di Fisica Nucleare, Subnucleare e
delle Radiazioni,
Marconi University,
Via Paolo Emilio 29,
Rome 00193, Italy
e-mail: e.bocci@unimarconi.it

Mauro Villarini

Dipartimento di Scienze Agrarie e Forestali,
Tuscia University of Viterbo,
San Camillo de Lellis, snc, Viterbo 01100, Italy
e-mail: mauro.villarini@unitus.it

Massimiliano Renzi

Facoltà di Scienze e Tecnologie,
Libera Università di Bolzano,
Piazza Università 5, Bolzano, BZ 39100, Italy
e-mail: Massimiliano.Renzi@unibz.it

1Corresponding author.

Manuscript received January 16, 2019; final manuscript received June 13, 2019; published online July 11, 2019. Assoc. Editor: Sunil Patil.

J. Eng. Gas Turbines Power 141(9), 091014 (Jul 11, 2019) (9 pages) Paper No: GTP-19-1015; doi: 10.1115/1.4044062 History: Received January 16, 2019; Revised June 13, 2019

In this study, the performance characteristics of a regenerative flow turbine (RFT) prototype have been investigated by means of a computational fluid dynamics (CFD) study. The prototype has been initially designed to be used in gas pipelines replacing expansion valves but, because of the intrinsic characteristics of this kind of expander, its use can be extended to other applications like the expansion process in small-scale organic Rankine cycle (ORC) plants. In the first part of this work, the numerical results of the CFD analysis have been validated with the experimental data reported in literature for the same turbine prototype. After the validation of the model, a detailed study has been carried out in order to evaluate specific features of the turbine, focusing the attention on the typical operating conditions of small-scale low-temperature ORC systems. Results have shown that the considered RFT prototype operates with higher isentropic efficiencies (about 32% at 6000 rpm) at lower mass flow rates, while the power output is penalized compared to other operating points. The numerical analysis has also pointed out the high impact of the losses in the leakage flow in the gap between the blade tips and the stripper walls. Therefore, the CFD analysis carried out has provided a thoughtful understanding of the performance of the expander at varying operating conditions and useful insights for the future redesign of this kind of machine for the application in small-scale ORCs.

FIGURES IN THIS ARTICLE
<>
Copyright © 2019 by ASME
Your Session has timed out. Please sign back in to continue.

References

Quail, F. J. , Scanlon, T. , and Strickland, M. , 2010, “ Development of a Regenerative Pump Impeller Using Rapid Manufacturing Techniques,” Rapid Prototyping J., 16(5), pp. 337–344. [CrossRef]
Meakhail, T. , and Park, S. O. , 2005, “ An Improved Theory for Regenerative Pump Performance,” Proc. Inst. Mech. Eng. Part, A, 219(3), pp. 213–222. [CrossRef]
Quail, F. , Stickland, M. , and Baumgartner, A. , 2011, “ A One-Dimensional Numerical Model for the Momentum Exchange in Regenerative Pumps,” ASME J. Eng. Gas Turbines Power, 133(9), p. 093001. [CrossRef]
Song, J. W. , Engeda, A. , and Chung, M. K. , 2003, “ A Modified Theory for the Flow Mechanism in a Regenerative Flow Pump,” Proc. Inst. Mech. Eng., Part A, 217(3), pp. 311–321. [CrossRef]
Yoo, I. S. , Park, M. R. , and Chung, M. K. , 2005, “ Improved Momentum Exchange Theory for Incompressible Regenerative Turbomachines,” Proc. Inst. Mech. Eng., Part A, 219, pp. 567–581. [CrossRef]
Badami, M. , and Mura, M. , 2010, “ Theoretical Model With Experimental Validation of a Regenerative Blower for Hydrogen Recirculation in a PEM Fuel Cell System,” Energy Convers. Manage., 51(3), pp. 553–560. [CrossRef]
Engeda, A. , and Raheel, M. , 2003, “ Theory and Design of the Regenerative Flow Compressor,” International Gas Turbine Congress, Tokyo, Japan.
Nejad, J. , Riasi, A. , and Nourbakhsh, A. , 2017, “ Performance Improvement and Parametric Study of Regenerative Flow Pump Considering the Modification in Blade and Casing Geometry,” Int. J. Numer. Methods Heat Fluid Flow, 27, pp. 1887–1906. [CrossRef]
Karlsen-Davies, N. D. , and Aggidis, G. A. , 2016, “ Regenerative Liquid Ring Pumps Review and Advances on Design and Performance,” Appl. Energy, 164, pp. 815–825. [CrossRef]
Quail, F. , Scanlon, T. , and Baumgartner, A. , 2012, “ Design Study of a Regenerative Pump Using One-Dimensional and Three-Dimensional Numerical Techniques,” Eur. J. Mech. B/Fluids, 31, pp. 181–187. [CrossRef]
Karlsen-Davies, N.-H. D. , Computational and Experimental Analysis of the Effects of Manufacturing Tolerances on the Performance of a Regenerative Liquid Ring Pump, Engineering Department, Lancaster University, Lancaster, UK, p. 204.
Raheel, M. , and Engeda, A. , 2002, “ Current Status, Design and Performance Trends for the Regenerative Flow Compressors and Pumps,” ASME Paper No. IMECE2002-39594.
Hollenberg, J. W. , and Potter, J. H. , 1979, “ An Investigation of Regenerative Blowers and Pumps,” J. Eng. Ind., 101(2), pp. 147–152. [CrossRef]
Muller , S. , 2004, “ Consider Regenerative Pumps for Low-Flow/Low-NPSH Applications,” Hydrocarbon Process, (2004), pp. 55–57. https://www.hydrocarbonprocessing.com/magazine/2004/august-2004/special-report-fluid-flow-and-rotating-equipment/consider-regenerative-pumps-for-low-flowlow-npsh-applications
Griffini, D. , Salvadori, S. , Carnevale, M. , Cappelletti, A. , Ottanelli, L. , and Martelli, F. , 2015, “ On the Development of an Efficient Regenerative Compressor,” Energy Procedia, 82, pp. 252–257. [CrossRef]
Bartolini, C. M. , and Salvi, D. , 1996, “ Experimental Analysis of a Small Prototype of Peripheral Turbine for Decompression of Natural Gas,” ASME Paper No. 96-GT-515.
Balducci, F. , 1992, Indagine Sperimentale Sul Campo Fluidodinamico Interno Alle Turbine a Canale Periferico, Energy Department, University of Ancona, Ancona, Italy, pp. 110–113.
Denton, J. D. , 2010, “ Some Limitations of Turbomachinery CFD,” ASME Paper No. GT2010-22540.
ANSYS®, “Academic Research CFD, Release 18.0”.
Muhammad, U. , Imran, M. , Lee, D. H. , and Park, B. S. , 2015, “ Design and Experimental Investigation of a 1 kW Organic Rankine Cycle System Using R245fa as Working Fluid for Low-Grade Waste Heat Recovery From Steam,” Energy Convers. Manage., 103, pp. 1089–100. [CrossRef]
ANSYS®, “Academic Research CFD, Release 18.0, ANSYS Fluent User's Guide,” p. 1571.
ANSYS®, “Ansys Fluent Theory Guide, Release 18.0, ANSYS Fluent Theory Guide”.
Badami, M. , and Mura, M. , 2012, “ Comparison Between 3D and 1D Simulations of a Regenerative Blower for Fuel Cell Applications,” Energy Convers. Manage., 55, pp. 93–100. [CrossRef]
Kanase, R. S. , Pise, A. T. , and Garje, P. C. , 2017, “ Experimental and CFD Analysis of Regenerative Pump,” 24th National and second International ISHMT-ASTFE Heat and Mass Transfer, Kathmandu, Nepal.
Karanth, K. V. , and Sharma, N. Y. , 2014, “ CFD Analysis of a Regenerative Pump for Performance Enhancement,” Third World Conference on Applied Sciences, Engineering & Technology, Kathmandu, Nepal, Sept. 27–29.
Maity, A. , Chandrashekharan, V. , and Afzal, M. W. , 2015, “ Experimental and Numerical Investigation of Regenerative Centrifugal Pump using CFD for Performance Enhancement,” Int. J. Curr. Eng. Technol., 5, pp. 2898–2903. http://inpressco.com/category/ijcet
Quail, F. , Scanlon, T. , and Stickland, M. , 2011, “ Design Optimisation of a Regenerative Pump Using Numerical and Experimental Techniques,” Int. J. Numer. Methods Heat Fluid Flow, 21, pp. 95–111. [CrossRef]
Quail, F. J. , Stickland, M. , and Scanlon, T. , 2010, “ Numerical and Experimental Design Study of a Regenerative Pump,” AIP Conf. Proc., 1220, p. 165.
Dixon, S. L. , and Hall, C. A. , 2010, Fluid Mechanics and Thermodynamics of Turbomachinery, 6th ed., Elsevier Inc., University of Cambridge, Cambridge, UK.
Denton, J. D. , 1993, “ Loss Mechanisms in Turbomachines,” J. Turbomach., 115(4), pp. 621–656. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

RFT and impeller: experimental apparatus (a) and (b) [17] and three-dimensional model (c) and (d)

Grahic Jump Location
Fig. 2

Half-section view of the RFT with dimensions

Grahic Jump Location
Fig. 3

Three-dimensional mesh domain of the RFT with zoom-in mesh structure of the leakage gap zone

Grahic Jump Location
Fig. 4

Variation of the outlet temperature with mesh density

Grahic Jump Location
Fig. 5

Comparison of outlet temperature (top) and isentropic efficiency (bottom) between CFD results and experimental data [17]

Grahic Jump Location
Fig. 6

Velocity vectors in a typical cross section plane in the channel at 3000 rpm (BM = 0.08) and 0.3 kg/s (m˙=0.054)

Grahic Jump Location
Fig. 7

Iso-pressure surfaces at 3000 rpm (BM = 0.08) and 0.3 kg/s (m˙=0.054)

Grahic Jump Location
Fig. 8

(a) position of sample points along the channel and (b) variations of total pressure along the channel at 3000 rpm (BM = 0.08) and different flow rates

Grahic Jump Location
Fig. 9

The total pressure ratio of the RFT at different working conditions

Grahic Jump Location
Fig. 10

Streamlines colored by the total temperature of the flow at 6000 rpm (BM = 0.16) and 0.2 kg/s (m˙=0.038)

Grahic Jump Location
Fig. 11

Isentropic efficiency by reduced mass flow rate in different BMs

Grahic Jump Location
Fig. 12

Power coefficient (ψ) by reduced mass flow rate in different BMs

Grahic Jump Location
Fig. 13

Relative entropy loss coefficient in three zones at 3000 rpm (BM = 0.079) and 0.3 kg/s (m˙=0.054)

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In