Flow and performance study on centrifugal pump for a left entricular assistant device
碩士 === 南台科技大學 === 機械工程系 === 95 === The impeller type left ventricular assist device (LVAD) uses rotating impeller pumping blood. It mainly falls two categories. They are the one with centrifugal type impeller and that with axial-flow impeller. The study concentrates on centrifugal type impeller desi...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/10850165214109234476 |
| Summary: | 碩士 === 南台科技大學 === 機械工程系 === 95 === The impeller type left ventricular assist device (LVAD) uses rotating impeller pumping blood. It mainly falls two categories. They are the one with centrifugal type impeller and that with axial-flow impeller. The study concentrates on centrifugal type impeller design of the LVAD.We initially design three casing model with different outlet width and eccentric geometries in rotating impeller condition. the research chooses the best model in efficiency among them.then we design two clearance type of parallel gap between impeller and casing.Flow analysis around the impeller is performed by using the finite volume method to solve the fully incompressible three-dimensional Navier-Stokes equations. We adopt the software of CFX 4.3 and ANSYS-CFX-10 to simulate the flow pattern and shear stress under different flow conditions. Results provide a comprehension of flow velocity, pressure and shear stress distribution of the flow domain for the designs.Performances of the two designs are evaluated by the comparison of the corresponding flow rate - rotation speed - pressure curves. On the other hand, shear stress is evaluated and a detailed comparison of the shear stress field of the two designs is demonstrated as well.
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