THERMAL SCIENCE

International Scientific Journal

NUMERICAL ANALYSIS OF FLOW STRUCTURE AND ENERGY LOSS IN AN IMPELLER SIDE CHAMBER OF A MOLTEN SALT PUMP

ABSTRACT
The internal flow structure and the energy loss in the first stage impeller side chamber of a molten salt pump for solar thermal power generation were investigated numerically. The flow field in the model pump was simulated based on the RANS equation using the standard k-ε turbulence model. The results indicate that the rotating speed of core flow in the front impeller side chamber is higher than the tangential velocity at the maximal radius of the front shroud. However, the core flow in the rear impeller side chamber gives an opposite trend. Meanwhile, the radial velocity at the boundary-layer separation point on the front impeller side chamber stationary wall decreases initially and then increases with the radius while it only decreases in the rear impeller side chamber. For the energy loss, the percentage of the disk friction loss to total energy consumption reduces as the flow rate increases, while the absolute value of disk friction loss on the front shroud keeps almost constant and the loss on the rear shroud decreases with the increasing flow rate.
KEYWORDS
PAPER SUBMITTED: 2017-12-21
PAPER REVISED: 2018-06-18
PAPER ACCEPTED: 2018-06-18
PUBLISHED ONLINE: 2019-09-14
DOI REFERENCE: https://doi.org/10.2298/TSCI1904333J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE 4, PAGES [2333 - 2341]
REFERENCES
  1. Garbrecht, O., et al., CFD-Simulation of a New Receiver Design for a Molten Salt Solar Power Tower, Solar Energy, 90 (2013), 2, pp. 94-106
  2. Ortega, J., et al., Central Receiver System Solar Power Plant Using Molten Salt as Heat Transfer Fluid, Journal of Solar Energy Engineering, 130 (2008), 2, pp. 247-266
  3. Ayad, A. F., et al., Effect of Semi-Open Impeller Side Clearance on the Centrifugal Pump Performance Using CFD, Aerospace Science & Technology, 47 (2015), Dec., pp. 247-255
  4. Will, B. C., et al., Investigation of the Flow in the Impeller Side Clearances of a Centrifugal Pump with Volute Casing, Journal of Thermal Science, 21 (2012), 3, pp. 197-208
  5. Piesche, D. I., et al., Investigation of the Flow in the Impeller-Side Space of Rotary Pumps with Super-imposed Throughflow for the Determination of Axial Force and Frictional Torque, Acta Mechanica, 78 (1989), 3, pp. 175-189
  6. Wang, X. Y., et al., Numerical Study of Flow Characteristics in the Impeller Side Chamber of Centrifu-gal Pump, Transactions of the Chinese Society for Agricultural Machinery, 40 (2009), 4, pp. 86-90
  7. Liu, H. L., et al., Calculation of Disk Friction Loss of Centrifugal Pumps, Transactions of the Chinese Society of Agricultural Engineering, 22 (2006), 12, pp. 107-109
  8. Guelich, J. F., Centrifugal Pumps, Springer-Verlag, Berlin, Germany, 2014
  9. Daily, J. W., et al., Chamber Dimension Effects on Induced Flow and Frictional Resistance of Enclosed Rotating Disks, Journal of Basic Engineering, 82 (1960), 1, pp. 217
  10. Senoo, Y., et al., An Analysis on the Flow in a Casing Induced by a Rotating Disk Using a Four-Layer Flow Model, Transactions of the Japan Society of Mechanical Engineers, 98 (1976), 2, pp. 2462-2471
  11. Li, W., et al., Experimental Study of the New Method on Reducing Friction Losses of Disk, Journal of Hydrodynamics, 13 (1998), 1, pp. 65-70
  12. Yang, J. H., et al., Mathematical Model of Flow inside a Centrifugal Pump Casing, Transactions of the Chinese Society of Agricultural Machinery, 34 (2003), 6, pp. 68-72
  13. Shao, C. L., et al., Experimental Investigation of the Full Flow Field in a Molten Salt Pump by Particle Image Velocimetry, Journal of Fluids Engineering, 137 (2015), 10, ID 104501

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence