Numerical Simulation of Cavitation in Mixed Flow Pump

The purpose of this study is to investigate the performance and three-dimensional behavior of the flow in a mixed flow pump and the way cavitation phenomenon is affected by different parameters such as fluid temperature, pump speed and flow rate. Computational fluid dynamic software FLUENT wasutilized to simulate the whole flow field of the pump. RNG k-ε model combined with standard wall functions was chosen to deal with the turbulent feature of the problem. The studied pump had fourblades mounted on a conical hub which formed the rotary part and nine static vanes afterward as thestationary part. So the rotor-stator interaction was treated with a Multiple Reference Frame (MRF) technique. The flow rates and pump speed were the key parameters for investigation. While the flow rates variation and the pump revolution changed cavitation occurrence widely, the temperature variations caused by weather changes during a year had little effect on cavitation. The cavitation region which is defined by the saturation pressure in that temperature was shown for various cases on a blade

Keywords:

Mixed-flow Pump , Multiple Reference Frame , Computational Fluid Dynamics , Cavitation