# Performance prediction of a centrifugal pump working in direct and reverse mode using Computational Fluid Dynamics

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3 map of the static pressure at the near-tongue region, obtained at impeller mid-span, for the 60%, 100%, and 130% of pump rated flow. The relative velocity vectors are also included in the figure. It is observed that the static pressure increases continuously along the impeller passageways from the inner to the outer region as energy is transmitted due to the impulse of the blades. The pressure reaches higher values at the lowest flow rate while decreasing with increasing flow rates, as expected for a centrifugal pump (see Fig. 2). A low pressure region is noted near the tongue for the 60% flow rate. This region is located between the tongue and the impeller, as can be seen in the top image. In contrast, the highest flow rate (130% of rated) shows a low pressure region close to the exit duct and, additionally, a high pressure region between tongue and impeller. The flow progresses smoothly through this volute region at nominal flow rate. observed that there is a region located near the blade pressure side (dashed circle) where the flow reverses direction, thus constituting a re-circulating bulk of fluid. This recirculation provokes a pressure drop that changes pressure direction in the last portion of the blade (i.e. there is a higher pressure on the suction side than on the pressure side). In consequence, this blade does not transmit energy to the fluid in its last portion when passing near the tongue. Fig. 4. Instantaneous map of static pressure at the near-tongue region and relative velocity vectors for three test flow rates (reverse mode of operation). Fig. 3. Instantaneous map of static pressure at the near-tongue region and relative velocity vectors for three test flow rates (direct mode of operation). The relative velocity vectors show that there is a good guidance of the flow along the passageways for medium and high flow rates, showing streamlines adhered to the blade walls. At the lowest flow rate, in contrast, it is Fig. 4 presents equivalent results for similar flow rates of those shown in Fig. 3. In the present case, however, the pump operates in reverse mode (centripetal turbine). As noted, the pressure diminishes from the outer to the inner section of the impeller due to the continuous transmission of energy from fluid to blades. The net head across the impeller increases with increasing flow rates, as expected for a centripetal turbine (see characteristics of Fig. 2). While the pressure seems quite uniform at the tongue region for the 60% flow rate, it can be seen that there is a

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### PEMP RMD M.S. Ramaiah School of Advanced Studies

Radial Turbines Session delivered by: Prof. Q.H. Nagpurwala 1 Session Objectives This session is intended to introduce the following: Types of radial gas turbines Constructional features Radial gas turbines