THERMAL SCIENCE

International Scientific Journal

COMPUTATIONAL FLUID DYNAMIC ANALYSIS AND VALIDATION OF THE SINGLE STAGE LOW PRESSURE ROTARY LOBE COMPRESSED AIR EXPANDER

ABSTRACT
Technologies using media with relatively low thermodynamic parameters are now being developed more and more widely. These technologies may be used in industrial processes in which waste media such as low pressure air or other gases are available. One of the technologies enabling the use of such gases is rotary lobe expander. Rotary lobe expanders are compressed gas-powered devices which produce electricity or mechanical energy. In terms of the nature of operation, these devices are similar to turbines, but have higher efficiency at lower operating pressure. Currently, they are applied in mines as engines or as drives for elevators. The paper covers the CFD model of the expander and its validation using the literature data on the industrial device. The mathematical model, geometry, the choice of the computational grid and the adopted boundary conditions were presented. Several simulations were carried out for the variable operational parameters of the device and an attempt was made to assess the correctness of the assumptions and developed model. Finally, the results with discussion are presented both in tabular and graphical forms.
KEYWORDS
PAPER SUBMITTED: 2018-12-15
PAPER REVISED: 2019-02-15
PAPER ACCEPTED: 2019-02-26
PUBLISHED ONLINE: 2019-09-22
DOI REFERENCE: https://doi.org/10.2298/TSCI19S4133K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 4, PAGES [S1133 - S1142]
REFERENCES
  1. ***, Armak GmbH - Motoren, www.armakmotor.de
  2. ***, GLOBE Benelux, www.globe-benelux.nl
  3. Sadiq, G. A., et al., CFD Simulations of Compressed Air Two Stage Rotary Wankel Expander - Parametric Analysis, Energy Convers. Manag., 142 (2017), June, pp. 42-52
  4. Norwood, Z., et al., Testing of the Katrix Rotary Lobe Expander for Distributed Concentrating Solar Combined Heat and Power Systems, Energy Sci. Eng., 2 (2014), 2, pp. 61-76
  5. Antonelli, M., Martorano, L., A Study on the Rotary Steam Engine for Distributed Generation in Small Size Power Plants, Appl. Energy, 97 (2012), Sept., pp. 642-647
  6. Antonelli, M., et al., Operating Maps of a Rotary Engine Used as an Expander for Micro-Generation with Various Working Fluids, Appl. Energy, 113 (2014), Jan., pp. 742-750
  7. Warren, S., Yang, D. C. H., Design of Rotary Engines from the Apex Seal Profile, Mech. Mach. Theory, 64 (2013), June, pp. 200-209
  8. Schiffer, J., Klomberg, S., CFD-Calculation of the Fluid Flow in a Rotary Lobe Pump - Evaluation of a Numerical Model Based on Measurement Results, Proceedings, 15th International Conference on Fluid Flow Technologies, Budapest, 2012, pp. 1-8
  9. Vande Voorde, J., et al., Flow Simulations in Rotary Volumetric Pumps and Compressors with the Fictitious Domain Method, J. Comput. Appl. Math., 168 (2004), 1, pp. 491-499
  10. ***, ANSYS Inc., ANSYS CFX
  11. Rocha, P.A.C., et al., k-ω SST (Shear Stress Transport) Turbulence Model Calibration: A Case Study on a Small Scale Horizontal Axis Wind Turbine, Energy, 65 (2014), Feb., pp. 412-418
  12. Menter, F. R., Review of the Shear-Stress Transport Turbulence Model Experience from an Industrial Perspective, Int. J. Comut. Fluid Dyn., 23 (2009), 4, pp. 305-316
  13. Zhang, D., et al., Study on Tip Leakage Vortex in an Axial Flow Pump Based on Modified Shear Stress Transport k-ω Turbulence Model, Thermal Science, 17 (2013), 5, pp. 1551-1555
  14. Shih, T.-H., et al., A New k-ε Eddy Viscosity Model for High Reynolds Number Turbulent Flows, Compurers Fluids, 24 (1995), 3, pp. 227-238
  15. Singh, P. J., Onuschak, A. D., A Comprehensive Computerized Method for Twin Screw Rotor Profile Generation and Analysis, Proceedings, International Compressor Engineering Conference, Purdue University, West Lafayette, Ind., USA, 1984, pp. 519-527
  16. He, W., et al., Influence of Intake Pressure on the Performance of Single Screw Expander Working with Compressed Air, Appl. Therm. Eng., 51 (2013), 1-2, pp. 662-669
  17. Ng, K. C., et al., A Thermodynamic Model for the Analysis of Screw Expander Performance, Heat Recover. Syst. CHP, 10 (1990), 2, pp. 119-133
  18. Nilsson, H. R., Rotor Device, US Patent No. US2975963A, United States Patent Office,
  19. Kasuya, K., et al., Male and Female Screw Rotor Assembly with Specific Tooth Flanks, US Patent No. 04401420, United States Patent Office
  20. Bowman, J. L., Helical Screw Rotor Profiles, US Patent No. 4412796, United States Patent Office
  21. Lee, H.-T., Screw-Rotor Machine with an Ellipse as a Part of its Male Rotor, US Patent No. 4890992, United States Patent Office
  22. Gulich, J. F., Centrifugal Pumps, Springer-Verlag, Berlin, 2014

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