Conceptual Framework of Centrifugal Pumps towards Industrial Revolution

In recent years, researchers have put a considerable effort to increase the eff iciency in a centrifugal pump .The current scenariointhe impeller design interest has considerably increased in recent years in various publication, statingthe pump eff iciency, pump performance, impeller design, modif ication the vane angle through CFD analysis has consideration to elaborate the conceptual frame work of a centrifugal pumps. Key wordsCentrifugal pumps, CFD, Eff iciency, Failure analysis, Impeller design, Numerical analysis, Optimization ———————————————————— Introduction-S.C.M. Yu(2000)Investigated the flow patterns within the impeller passages of a centrifugal blood pump of which different types of blade geometry have been tested including the radial straight blade and backward swept blade designs. Both designs can achieve a head of about 100 mm Hg at the design point Jong-Soo Choi(2005) experimented large-scale flow instabilities in a pump rotor and the process of noise generation on the unsteady flow field and mechanism of a centrifugal turbomachine has been performed.The jet-wake flow pattern found in the impeller blade passages induces a strong vorticity field near the trailing edge of each blade.The rotating discharge instability in the impeller discharge is very similar in its behavior to the phenomenon known as rotating stall found in centrifugal impellers and diffusers. The surface pressure spectrum measured at the trailing edge of each blade revealed a cluster of peaks, which were identified with integer mode numbers. Ismaier (2009) proposed Centrifugal pumps generate in piping systems noticeable pressure pulsations of which the dynamic interaction between water hammer and pressure pulsations was presented. Different measurements at this testing facility show that pulsating centrifugal pumps can damp pressure surges generated by fast valve closing.Centrifugal pumps generate especially in part load and at high pump speed noticeable pressure pulsations. These pressure pulsations can interact with pressure waves caused for example by fast valve closing AhNemdlh.Dieter-Heinz Hellmann(1999) stated the application of a centrifugal pump for desalination and ————————————————  Selvarasu.A, PG student, Department of Mechanical Engineering, Anna University of Technology, Coimbatore, India, PH-+919786029045. E-mail: [email protected]  Kanthavel.K, Assistant professor, Department of Mechanical Engineering,Anna University of Technology, Coimbatore, India  Krishnaraj.R, JRF(professional), Department of Mechanical Engineering,AnnaUniversityof Technology, Coimbatore, India power plants, and the energy usage and the maintenance costs during the operation of the pump was reduced .Daniel Wolfram(2010)observed that low circumferential Mach number the sound of isolated centrifugal fan impellers was dominated by distinctive tones at blade passing frequency (BPF) and integer multiples. This led to the preliminary conclusion that the BPF related tones are exclusively flow-induced. Based on hot-wire and blade pressure fluctuation measurements and a subsequent correlation analysis, coherent flow structures different from those associated with the principal azimuthal flow pattern due to the blades were detected. More likely the vortex structure detected here is related to the draft tube vortex found in water turbines or in the intake of pumps. PunitSingh (2010)concluded that a methodological approach has to be employed for using the optimization routine in field projects and to collect accurate operational data. R.Barrio (2011) experienced a significant radial load when operating at off-design conditions. Its average magnitude can be reasonably estimated at the design stage by existing formulas.The total radial load on the impeller of centrifugal pumps under different operating conditions can be reasonably estimated by means of the numerical simulation of the unsteady flow with an appropriate CFD code. It was observed that the maximum amplitudeof the unsteady torque can reach a magnitude of about 45% of theaverage value when operating at the lower flow rates). Ramazanbavindir (2011) explained the design of water pumping control system in the production plants and implemented an experimental setup in a laboratory. These plants contain harsh environments in which chemicals, vibrations or moving parts exist that could potentially damage the cabling or wires that are part of the control system.The proposed architecture and results demonstrate the feasibility of using IWLAN protocols to communicate effectively with PLCs. The system was tested using an industrial application and it had a very satisfactory performance. R. Spence(2009) proposed numerical model International Journal of Scientific & Engineering Research, Volume 3, Issue 2, February -2012 2 ISSN 2229-5518 IJSER © 2012 http://www.ijser.org of an entire double entry, double volute centrifuge pump to conduct a parametric study covering four main geometric parameters. Conceptual investigation