Design of Impeller Blade of Mixed Flow Pump: A Comparative Analysis

Design of Impeller Blade of Mixed Flow Pump: A Comparative Analysis

Divya Zindani, Apurba Kumar Roy, Kaushik Kumar
Copyright: © 2018 |Pages: 30
DOI: 10.4018/978-1-5225-3401-3.ch003
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Abstract

Mixed flow pumps have got a wide range of application such as that in irrigation, flood control, dewatering and power station cooling systems. A number of design templates have been in use to design the mixed flow pump impeller blades including free vortex theory and mean stream line theory. Here blade of the impeller of the mixed flow pump has been designed using Mean stream line theory and the free vortex theory and stresses arising due to static loading conditions has been obtained for both the cases. Comparison analysis for the equivalent stresses developed due to structural loading using various materials for the blade was undertaken. It was found that the stress for the blade designed using mean stream line theory is always on the higher side in comparison to that designed using free vortex theory. Further, out of the four materials of construction, titanium and copper were found to be suitable for blade designed using free vortex theory and the mean stream line theory respectively.
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Background

A pump is a device, which converts mechanical energy to hydraulic energy. Based on the impeller configuration and specific speed the pump is classified traditionally as radial flow, axial flow and mixed flow pump. A mixed flow pump is a centrifugal type of pump which works on the rotary mechanism. In a Mixed flow pump head is developed partially by centrifugal action and partially by lift of the vane on liquid. The liquid enters axially and discharges in radial and axial direction. These pumps have got a wide range of application having been applied to large scale liquid transfer tasks. Increased efforts are being made to extend the range of mixed flow pumps. However, their design and performance prediction process is still a cumbersome task, mainly due to the great number of geometric parameters

Over the period of time the “impeller blade design of mixed flow pump” has been carried out according to the various templates. Wislicenus (1947), initiated the design of a mixed flow pump impeller. Myles (1965), Stepanoff (1957), Neumann (1991), Gahlot and Nyiri (1993), have suggested the different design procedures for designing mixed flow pumps. Varchola and Hlbocan (2012), used the experimental results of an internal impeller flow to create a geometrical design of a mixed flow pump.

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