The objective of this paper is to present 3-D numerical and experimental study of the effect of blade angle on the cavitation phenomenon. The numerical computation in cavitating flow carried out using the Navier-Stokes code (CFD-ACE+ 2008) is presented. The governing equations are discretized on a structured grid using an upwind difference scheme. The numerical simulation used the standard K-Îµ turbulence model to account for the turbulence effect. Pressure distribution and vapor volume fraction were obtained numerically at variable blade angles. Also the performance curve of the axial pump was obtained at variable blade angles 60Â°, 70Â° and 80Â°. The numerical and experimental results showed that the cavitation phenomenon appeared at blade angle 60Â° only. The computational code has been validated by comparing the predicted numerical results with the experimental ones. Besides, the predicted void growth and cavitation distribution on the impeller blade agreed with those visualized with high speed camera. The cavitation phenomenon is an important cause of wear and damages in turbo machines. Cavitation occurs during the flow of water in the presence of regions of high flow velocity when local static pressure decreases below the vapor pressure. Calculation of incipient cavitation is simple as one has just to find the lowest pressure indicating the cavitation inception once this lowest pressure reaches the vapor pressure. [Mostafa NH, Adel M (2012) Effect of Blade Angle on Cavitation Phenomenon in Axial Pump].
Last date updated on July, 2014