Cfd analysis of a centrifugal pump impeller with and without cavitating flow conditions
Başlık çevirisi mevcut değil.
- Tez No: 796631
- Danışmanlar: DR. ZEESHAN RANA
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Blade number, Cavitation, Centrifugal pump, Computational fluid dynamics, Impeller
- Yıl: 2016
- Dil: İngilizce
- Üniversite: Cranfield University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 127
Özet
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Özet (Çeviri)
Centrifugal pumps have a substantial role in the industrial and domestic areas. In order to improve the performance and the lifetime of pumps, it is necessary to analyse the flow fields in pumps. With the improvements of the computational fluid dynamics methods, researchers carried out numerous numerical studies on centrifugal pumps. The studies include different topics such as the prediction of cavitation, performance improvement with the design optimisation techniques, effects of blade number on performance of centrifugal pumps. In this thesis, the analysis of a centrifugal pump impeller was conducted using CFD methods. The 7 blade impeller was generated using the software ANSYS Vista CPD (Centrifugal Pump Design) and BladeGen. Different structured grids with the element numbers ranging from 62,500 to 1,000,000 were created using ANSYS TurboGrid. Also, near wall grid resolution was investigated using different y+ values ranging from 1 to 100. Firstly, the simulation were performed without cavitating flow condition and effects of grid resolutions and turbulence models were investigated applying the standard k-ɛ model, the standard k-ω model, the RNG k-ɛ model and the SST k-ω model. The obtained head rise of the pump were evaluated and compared with each other and the design point head value. The validation and verification processes were carried out and the grid containing half million elements with y+ 20 and the SST k-ω model was selected for further investigations due to its accurate and consistent results. Secondly, effect of number of blade was examined with the blade numbers of 4, 5, 6 and 7 comparing the head and the efficiency results. Then the simulations were done for cavitation predictions. The characteristic cavitation curves for different number of blades were presented and finally the flow features in the impeller was analysed using the pressure and the vapour volume fraction distributions and the isosurfaces.
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