Commenced in January 2007
Paper Count: 30172
Instability Problem of Turbo-Machines with Radial Distortion Problems
Abstract:In the upstream we place a piece of ring and rotate it with 83Hz, 166Hz, 333Hz,and 666H to find the effect of the periodic distortion.In the experiment this type of the perturbation will not allow since the mechanical failure of any parts of the equipment in the upstream will destroy the blade system. This type of study will be only possible by CFD. We use two pumps NS32 (ENSAM) and three blades pump (Tamagawa Univ). The benchmark computations were performed without perturbation parts, and confirm the computational results well agreement in head-flow rate. We obtained the pressure fluctuation growth rate that is representing the global instability of the turbo-system. The fluctuating torque components were 0.01Nm(5000rpm), 0.1Nm(10000rmp), 0.04Nm(20000rmp), 0.15Nm( 40000rmp) respectively. Only for 10000rpm(166Hz) the output toque was random, and it implies that it creates unsteady flow by separations on the blades, and will reduce the pressure loss significantly
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1078691Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1157
 CAMPOS-AMEZCUA R., KHELLADI S., BAKIR F., CZERWIEC Z.M., SARRAF C., REY R., "Numerical Analysis of Unsteady Cavitating Flow in an Axial Inducer", Part A: J. Power and Energy, 2010, 224 (2), 223-238.
KHELLADI S., KOUIDRI S., BAKIR F., REY R.
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 Obikane Y., Kaneko M., Kakioka M, Ogura K."Image Analysis of Fine Structures of Supercavitation in the Symmetric Wake of a Cylinder", WASET, proceedings, Paris, June 24, 2011