Numerical simulation of incompressible turbulent flow in shrouded disk system with radial outflow

Document Type: Research Paper

Authors

Mechanical Engineering Department, Semnan University, Semnan, Iran

10.22059/ees.2019.34607

Abstract

The flow behavior inside the shrouded disk system is of importance in appropriate design of turbomachinery cavities and turbine test cell hydraulics dynamometer. The turbulent incompressible flow is analyzed for the shrouded disk system with axial clearance. The flow core behaves as a Batchelor type structure when a weak inflow is imposed on the disk cavity. By increasing the inflow, the central core disappears and the tangential velocity distribution is changed to Stewartson type structure. The central core again reappears by increasing the Reynolds number. The moment coefficient of rotary disk depends on superimposed flow rate coefficient and dimensionless geometrical parameters. Moment coefficient increases with increasing inflow rate while the other parameters remain constant. The coefficient is reduced by increasing the Reynolds number. Moreover, it increases with both increasing rotary and stationary disks axial distance, and decreasing clearance ratio. The experimental results of a cavity with radial clearance are used to validate the accuracy of the simulation. The results of this analysis and its development can be used in the design of turbine test cell hydraulics dynamometers.

Keywords


[1] Daily J.W., Nece R.E., Chamber Dimension Effects on Induced Flow and Frictional Resistance of Enclosed Rotating Disk", Journal of Basic Engineering 82: 217-232(1960).

[2] Hu B., Brillert D., Dohmen H. J., Karl Benra F., Investigation on the Flow in a Rotor-Stator Cavity with Centripetal Through-Flow, International Journal of Turbomachinery, Propulsion and Power (2017).

[3] Kurokawa J., Sakuma M,, Flow in a Narrow gap along an Enclosed Rotating Disk with Through-Flow", JSME International Journal, Series II, 31(2): 243-25 (1988).

[4] Bayley F.J., Owen J.M., Flow between a Rotating and a Stationary Disc, Aeronautical Quarterly, 20: 333-354 (1969).

[5] Altmann D., Beitrag Zur Berechnung Der Turbulenten Strömung im Axialspalt Zwischen Laufrad und Gehäuse von Radialpumpen, Dissertation, TU Magdeburg (1972).

[6] Iacovides H., Toumpanakis, Turbulence Modeling of Flow in Axisymmetric Rotor-Stator Systems, 5th  International Symposium on Refined Flow Modelling and Turbulence Measurements, Paris, The International Association for Hydro-Environment Engineering and Research, 835-842 (1993).

[7] Haddadi S., Poncet S., Turbulence Modeling of Torsional Couette Flows, International Journal of Rotating Machinery, 2008: 2008, Article ID 635138, 27.

[8] Bayley F. J., Owen J. M., The Fluid Dynamic of a Shrouded Disk System With a Radial Outflow of Coolant, ASME Journal of  Engineering for Power , 92: 335 (1970).

[9] Phadke U. P., Owen J. M., An Investigation of Ingress for an Air-Cooled Shrouded Rotating Disk System With Radial Clearance Seals”, ASME Journal of Engineering for Gas Turbine and Power, 105: 178-182 (1983).

[10] Launder B., Poncet S,, Serre E., Laminar, Transitional and Turbulent Flows in Rotor-Stator Cavities, School of Mechanical, Aerospace & Civil Engineering, The University of Manchester (2010).

[11] Poncet S., Schiestel R., Chauve M.P., Turbulence Modelling and Measurements in a Rotor-Stator System with Throughflow, Engineering Turbulence Modelling and Experiments ETMM6, Elsevier (New-York) 761-770 (2005).

[12] Orszag S. A., Yakhot V., Flannery W. S., Boysan F., Choudhury D., Maruzewski J., Patel B., Renormalization Group Modeling and Turbulence Simulations", In International Conference on Near-Wall Turbulent Flows, Tempe, Arizona (1993).