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To find the relationship between the vane angles and the impeller performance the optimum vane angle is achieved step by step. Three CAD models are modeled with the vane angles between existing and optimum values. These models are analyzed individually to find the performance of the impeller. From the outlet flow conditions, obtained from the CFD analysis, it is evident that the reduced outlet recirculation and flow separation cause the improved efficiency. By changing the outlet angle the efficiency of the impeller is improved to 59%.

The impeller was analyzed in the rotating frame of reference and the flow outside the impeller was analyzed in the stationary frame of reference. All simulations were carried out using water as the pumping liquid. At the inlet of the impeller the total pressure and the flow direction were specified whereas at the outlet the mass flow rate was fixed based on the condition to be investigated. Solver should be selected in such a way that the type of analysis needed is validated properly by the solver. To analyze the mixed flow impeller the type of analysis used is moving frame of reference.

Computational fluid dynamics analysis of a mixed flow pump impeller

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As the flow entering the impeller eye, it is diverted into the blade-to-blade passage. Due to the unsteady effect developed at upstream, the flow entering the passage is no longer tangential braudoa.in to the leading edge of impeller blade. Increased flow velocity can be observed at the blade inlet due to the blockage of the flow, whereas on the contrary the pressure is reduced .

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This analysis type is valid one to analyze the mixed flow impeller as the impeller is the rotating part with rotation rate rpm. For every analysis the reports were generated to obtain the area averaged values of pressure and velocity in the outlet of the impeller. These outlet flow conditions were used to calculate the head developed, power rating and efficiency o f the impeller. To improve the efficiency of mixed flow pump, Computational Fluid Dynamics analysis is one of the advanced tools used in the pump industry. A detailed CFD analysis was done to predict the flow pattern inside the impeller which is an active pump component. From the results of CFD analysis, the velocity and pressure in the outlet of the impeller is predicted. These outlet flow conditions are used to calculate the efficiency of the impeller.

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These parts are important while analyzing a pump because mechanical energy is transferred into fluid energy by the active pump components. The geometry of a mixed flow pump impeller is highly complex in nature. The mixed flow geometry consists of several features among those following geometric features are important as they have direct effect on overall pump performance . The top 10 solar panel manufacturers in India will help to transform India’s solar industry, especially over the next 4-5 years. The country’s power sector is looking to invest about $225 billion by the end of 2022. Boundless opportunities surrounding power generation, distribution, transmission and manufacturing of solar equipment are held by these top 10 solar panel manufacturing companies in India. The government of India is also helping the cause by lowering solar power tariffs, from INR 15 /Kwh in 2009 to INR 2.44/ Kwh in 2017.

Further downstream the contours become smooth between the blades and the pressure increases continuously towards the exit of the computational domain. The isobar lines (Fig. 9) are not all perpendicular to the pressure side of the blade inside the impeller passage, this indicated that there could be a flow separation because of the pressure gradient effect. The hydraulic test was done on existing impeller and the results are compared with modified impeller CFD results. The k -e turbulence model can be used to analyze the mixed flow impeller and area averaged value of pressure and velocity can be used to calculate the head, efficiency and power rating of the impeller . To find the performance of modified impellers averaged velocities were taken (Dupont, 2003; Miner, 2001). A typical submersible pump consists of impeller, diffuser, riser, discharge adapter, intermediate bowl and shaft is shown in Fig. The active pump components of a mixed flow pump are mixed flow impeller and guide vanes.

But the internal flow conditions cannot be predicted by the experimental results. From the CFD analysis software and advanced post processing tools the complex flow inside the impeller can be analyzed. The complex flow characteristics like inlet pre-swirl, flow separation and outlet recirculation cannot be visualized by the experimental way of pump test. But in the case of CFD analysis the above flow characters can be visualized clearly. Moreover design modification can be done easily and thus CFD analysis reduces the product development time and cost. Mixed flow pumps are widely used for water transportation or as cooling water pumps in power stations.

The calculated value of efficiency from the empirical relations is 55%. The optimum inlet and outlet vane angles are calculated for the existing impeller by using the empirical relations. The CAD models of the mixed flow impeller with optimum inlet and outlet angles are modeled using CAD modelling software ProE WF3.