| The conoid suction side of the centrifugal pump is investigated in this paper based on the CFD numerical simulation and experimental test, and the flow characteristic closed by the inlet of the impeller is studied. The research on the relationship between the structure and shape of the suction chamber and the performance of centrifugal pump is carried out, also.The main works are as follows:1. Based on the development course of CFD (Computational Fluid Dynamic) and Pro/ENGINEERING, the numerical simulation method for interior flow state in centrifugal pump is built up, described as:the software of Pro/E for modeling, Gambit for meshing, and Fluent for simulations. The 3D models of there types of anti-corrosion chemical process pump as HCZ 50-160,65-160,150-250 are built by Pro/E, and blocking meshing method is applied to mesh the entity fluid field, and the simulation numerical method suit for centrifugal pump is determined.2. The interior flow state is studied in the cylindric (50-160), the tapered (65-160) and the diverging (150-250) suction side, relatively. With different flow mess, racial and axial position, the variation trend of 3D velocity components is studied. The flow state could be described as 3D spiral flow with racial and axial recirculations.3. The relationship between the shape of suction side and the performance of centrifugal pump was studied. Compared to tapered or diverging suction side, the same centrifugal pump with the cylindric model has higher performance. According to the conclusion above, new-type suction side is presented, described as cylindric section and coniod section. With the new-type suction side applied, the hydraulic performance is improved.4. The effective solution to weaken the prerotation and back flow in suction side is the built-in baffles. With different number, location, axial and radial length of the baffles in suction chamber, CFD numerical simulation is applied to predict the variation trend of performance parameters of centrifugal pump. According to the performance curve and the flow state in the chamber, the optimum baffle came out:the radial length is 1/4D0 (inlet diameter), and the 3/4 of the length of chamber is the value range of axial length for the baffle. And, two baffles should be put closed by inlet of the impeller.5. The experimental test of the centrifugal pump with different shape of suction chamber is reported. The test methods are explained by introducing structure of testing facility and data acquire system. With effective data processing methods, the results of 6 compassion programmes are concordant with the prediction data. |
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