İsmail BÖĞREKCİ, Pınar DEMİRCİOĞLU, Berkay SERT, Ahmet GÖGEBAKAN, Mujtaba ABBAKAR

INVESTIGATION OF STRESSES ON IMPELLER BLADES BY COMPUTATIONAL FLUID DYNAMICS (CFD) ANALYSES

Anahtar Kelimeler:

Blade thickness, CFD, FSI, Impeller, Von-Mises stress, Polytropic efficiency

INVESTIGATION OF STRESSES ON IMPELLER BLADES BY COMPUTATIONAL FLUID DYNAMICS (CFD) ANALYSES

This paper discusses how stresses on the impeller blades are affected by the temperature, pressure, and blade thicknesses. During operation, the impeller experiences many kinds of stresses caused by thermal, fluid, and mechanical effect. These may deform the impeller blades if the stresses are too high. The impeller used in this case study was provided by HAUS Centrifuge Technologies and this impeller was damaged in the field during the operation. Six different blade thicknesses were structurally analyzed, and the Von-Mises stresses were compared to the impeller material yield strength. The impeller with the least stress was then selected to perform the FSI analysis. It was then manufactured, and a performance test was performed using the ISO 5389 in a test facility. From the CFD results, it was observed that the polytropic efficiency and the discharge temperature was affected by the change in blade thickness. It was concluded that an increase in blade thickness reduces the stresses acting on the blade.

Keywords:

Blade thickness, CFD, FSI, Impeller, Von-Mises stress, Polytropic efficiency,

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1. Friedrich-Karl, B., Hans Josef, D., Ji, P., Sebastian S., Bo, W., “A comparison of one-way and two-way coupling methods for numerical analysis of fluid-structure interactions”, Journal of Applied Mathematics, Vol 2011, 2011.
2. Gu, Y., Pei, J., Yuan, S., Xing, L., Stephen, C., Zhang, F., Wang, X., “Effects of blade thickness on hydraulic performance and structural dynamic characteristics of high-power coolant pump at overload condition”, Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, Vol 232, Issue 8, 2018.
3. Lee, K., Huque, Z., Kommalapati, R., Han, S.E., “The Evaluation of Aerodynamic Interaction of Wind Blade Using Fluid Structure Interaction Method”, Journal of Clean Energy Technologies, Vol 3, Issue 4, Pages 270-275, 2015.
4. Gong, B.L., Jia, X.J., Wang, G.C., Liu, Z.W., “Study on application of CAE in a centrifugal compressor impeller”, Advanced Materials Research (AMR), Vol. 787, Pages 594-599, 2013. 5. ISO 5389 (2005) Turbo compressor- performance test code second edition, 2005.
6. Zheng, X., Ding, C., “Effect of temperature and pressure on stress of impeller in axial-centrifugal combined compressor”, Advances in Mechanical Engineering, Vol 8, Issue 6, Pages 1-11, 2016.
7. Zheng X, Jin L, Du T, Gan B, Liu F, Qian H., “Effect of temperature on the strength of a centrifugal compressor impeller for a turbocharger”, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol 227, Issue 5, Pages 896-904, 2012.
8. ISO 5167 (2003) Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full-Part 4: Venturi tubes, 2003.