50 ISSN (Print): 1844-6116 ISSN (Online): 2501-8795 https://www. jmte.eu Journal of Marine Technology and Environment DOI: 10.53464/JMTE.01.2023.08 ¶ (11 t) ¶ (11pt) ¶ (11 ¶ (11 t) NUMERICAL SIMULATION OF CENTRIFUGAL PUMP ¶ (11 p SCUPI Andrei-Alexandru 1 , PANAITESCU Mariana 1 & PANAITESCU Fanel-Viorel 1 ¶ (11 t) 1 Constanta Maritime University, Faculty of Naval Electro-Mechanics, 104 Mircea cel Batran Street, 900663, Constanta, Romania, e-mail address: andrei.scupi@gmail.com ¶ (11 p) ¶ (11 p) Abstract : Centrifugal pumps are most commonly used pumping devices in industry their being fit for pumping water. There are several types of centrifugal pumps, their differences in construction is due to their size and how cloggy the pumped water is. In the paper it was simulated a 2D centrifugal pump of small size used in daily activities. The simulation, performed with CFD (ANSYS-Fluent), was made for different inlet velocities of water. Different parameters, such as inlet pressure, outlet pressure, maximum velocity and flow rate, were calculated and graphically represented against inlet velocity. Also, graphical representation of pressure distribution and velocity distribution inside the impeller were presented for a better comprehension of the physical phenomena. Key words : centrifugal pump, numerical simulation, finite element analysis. 1. INTRODUCTION Hydraulic turbo-generators (turbo-pumps), creates an energy transfer at the impact between the rotor blades and the fluid flow, increasing the kinetic moment of the fluid. [2] The fluid passes through the suction zone, enters the rotor, where a kinetic energy is imprinted on it, transforms it into potential energy in the spiral chamber and exist through the discharge zone. [1] We will consider a 2D section of a centrifugal pump. It functionality, working principle and energy conversion its better visualized in two dimensions. In Figure 1 is shown a representation of a centrifugal pump, Bernoulli’s equation. Figure 1 Representation of a centrifugal pump where: 1 – inlet zone (ring); 2 – impeller; 3 – blade; 4 – spiral chamber; 5 – diffuser. The spiral chamber has the property to convert kinetic energy into potential energy. The continuity equation (1) tells us that the flow rate is constant no matter the section. Of course, this equation has certain limitations and applicability. [1] . 1 const S v Q    (1) In the same time, Bernoulli’s equation (2), under pressure form, shows that and decrease of dynamic pressure will result an increase of static pressure, or vice versa. [1] . 2 2 const p v s    (2) Since velocity is decreasing due to the increase of section, it means the dynamic pressure will decrease hence the static pressure will increase. The latter is necessary the overcome the loss of pressure due to friction. The larger the section of the spiral chamber on the outlet part, the smaller the velocity, the bigger the static pressure will be. Hence, designing the centrifugal pump depends on its industrial purposes. 2. CENTRIFUGAL PUMP SIMULATION 2.1 Centrifugal pump characteristics: Centrifugal pumps have a wide range of applications and they can vary in size from a few of centimetres in