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Static analysis on rotor of the vertical turbine used for offshore platforms |
ZHANG Jinfeng1*, SONG Haiqin1, ZHANG Fan1, YANG Zhijun2, LAI Liangqing1 |
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Shanghai Fire Research Institute of Emergency Management Department, Shanghai 200032, China |
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Abstract In order to investigate the static characteristics of the vertical turbine rotor, the type XBC18-178-240LC3 vertical turbine was chosen as the study object. First of all, a three-dimensional mathematical model of fluid flow in the vertical turbine and a physical model for the rotor system of the vertical turbine were generated by Creo according to design parameters and the flows of the vertical turbine with three-stages were simulated numerically by CFX under six conditions of 0.20Qd, 0.65Qd, 1.00Qd, 1.20Qd, 1.40Qd and 1.50Qd. Then, the physical model was imported into ANSYS Workbench and constraints were ad-ded to it according to the actual running environment. Finally, the numerical simulation results of flow field were imported into the physical model of the structure to realize the unidirectional fluid-structure interaction and then the static characteristics on the rotor system of the vertical turbine with the prestress were analyzed. It is demonstrated that the fluid pressure inside the impeller increases as the stage of the impeller increases and decreases as the flow increases; the maximum of the total deformation is located at the edge of the rear cover of the third-stage impeller and the maximums of the equivalent stress and equivalent strain are located at the intersection of the edge of the rear cover and the blade outlet in the third-stage impeller, which decrease with the increase of the flow; the maximum of equi-valent stress of the rotor is 118.23 MPa under four conditions of 0.20Qd, 0.65Qd, 1.00Qd and 1.50Qd, which is smaller than its allowable stress(250 MPa)and meets strength requirement;the pump′s working speed of 1 485 r/min is less than its first-order critical speed of 0.85 times, which meets the dynamic design requirement. Therefore, the vertical turbine of XBC18-178-240LC3 model meets the design and use requirements under safe operating conditions.
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Received: 18 March 2020
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