DESIGN AND ANALYSIS OF IMPELLER BLADE FOR AXIAL FLOW PUMPS

Abstract

Flows in hydro pumps are three-dimensional, complex and unsteady. Several flow phenomena dominate the performance, efficiency, noise and vibrations of these machines, and as a result must be accurately predicted. Flow analyzer are used to give a deeper insight into the underlying physics and enables one to identify and understand the predominant dynamic mechanisms, both steady and unsteady, which must be controlled and manipulated to enhance the performance design. In an analysis, an accurate description of both the local spatial and temporal organization of the flow is essential. Computational Fluid Dynamics (CFD) in industry has come to play a crucial role in predicting and analyzing fluid flows. This development has been driven by the availability of robust in-house and commercial CFD codes and by the massive increase in affordable computer speed and memory. This leads to a steady reduction in the costs of simulations compared to prototyping and model experiments. A design of axial pump is carried out and analyzed to get the best performance point. The design and performance analysis of axial pump are chosen because it is the most useful mechanical rotodynamic machine in fluid works which widely used in domestic, irrigation, industry, large plants and river water pumping system. In this paper, the pump the head and flow rate of this pump are 8 m and 1000 m3/hour and the speed is 1400 rpm. The performance analysis of axial pump is carried out after designing the dimensions of axial pump. So, impeller friction losses, disk friction losses and recirculation losses of centrifugal pump are also considered in performance analysis of axial pump. The Predicted Head and efficiency is compared with analytical results and it shows the good agreement.