International Journal of Fluid Machinery and Systems

한국유체기계학회 (Korean Society for Fluid machinery)
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Two-Way Coupled Fluid Structure Interaction Simulation of a Propeller Turbine

  • 심사 : 2010.12.14
  • 발행 : 2010.12.31
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초록

During the operation of a hydro turbine the fluid mechanical pressure loading on the turbine blades provides the driving torque on the turbine shaft. This fluid loading results in a structural load on the component which in turn causes the turbine blade to deflect. Classically, these mechanical stresses and deflections are calculated by means of finite element analysis (FEA) which applies the pressure distribution on the blade surface calculated by computational fluid dynamics (CFD) as a major boundary condition. Such an approach can be seen as a one-way coupled simulation of the fluid structure interaction (FSI) problem. In this analysis the reverse influence of the deformation on the fluid is generally neglected. Especially in axial machines the blade deformation can result in a significant impact on the turbine performance. The present paper analyzes this influence by means of fully two-way coupled FSI simulations of a propeller turbine utilizing two different approaches. The configuration has been simulated by coupling the two commercial solvers ANSYS CFX for the fluid mechanical simulation with ANSYS Classic for the structure mechanical simulation. A detailed comparison of the results for various blade stiffness by means of changing Young's Modulus are presented. The influence of the blade deformation on the runner discharge and performance will be discussed and shows for the configuration investigated no significant influence under normal structural conditions. This study also highlights that a two-way coupled fluid structure interaction simulation of a real engineering configuration is still a challenging task for today's commercially available simulation tools.

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참고문헌

  1. Cunha, F., Qian, R., Flemming, F., Chen, L. and Riedel, N., 2009, “Detailed Analysis of Flow Features in Propeller Turbines,” Waterpower XVI, Spokane, WA, USA.
  2. Hubner, B., Seidel, U. and Scherer, T., 2006, “Fluid-Structure Interaction with ANSYS and CFX - Investigation of Convergence Properties of Partitioned Solutions to Hydroelastic Systems,” 24th CADFEM Users’ Meeting, Stuttgart, Germany.
  3. Munch, C., Ausoni, P., Braun, O., Farhat, M. and Avellan, F., 2008, “Hydro Elastic Behavior of Vibrating Blades,” 24th IAHR Symp. on Hyd. Machinery and Systems, Foz do Iguassu, Brazil.
  4. Hubner, B., Seidel, U. and Roth, S., 2010, “Application of FLuid-Structure Coupling to Predict the Dynamic Behavior of Turbine Components,” 25th Symp. on Hyd. Machinery and Systems, Timisoara, Romania. https://doi.org/10.1088/1755-1315/12/1/012009
  5. ANSYS CFX Release 11.0, 1996-2006, Documentation, ANSYS Europe, Ltd.
  6. Gagnon, J.M., Illiescu, M., Ciocan, G.D. and Deschenes, C., 2008, “Experimental Investigation of Runner Outlet Flow in Axial Turbine with LDV and Stereoscopic PIV,” 24th IAHR Symp. on Hyd. Machinery and Systems, Foz do Iguassu, Brazil.
  7. Hubner, B., Aschenbrenner, T., Kachele, T., Suzuki, R., 2008, “Flow Prediction in Bulb Turbines,” 24th IAHR Symp. on Hyd. Machinery and Systems, Foz do Iguassu, Brazil.

피인용 문헌

  1. Fully coupled FSI analysis of Francis turbines exposed to sediment erosion vol.7, pp.3, 2014, https://doi.org/10.5293/IJFMS.2014.7.3.101
  2. Influence of fluid-structure interaction on vortex induced vibration and lock-in phenomena in long span bridges vol.10, pp.4, 2016, https://doi.org/10.1007/s11709-016-0353-y