| Jet pump is a sort of fluid machinery using for mass and energy transfer, which has been widely used in many industrial fields due to its unique advantage, e.g. high reliability, no rotatable parts involved, easy installation and maintenance.In this study, the commercial available CFD software FLUENT is employed to analyze the flow field inside the jet pump and then clarify the pump structure and working parameters on the working performance. Moreover, the performance of the cavitation-prevent device is also investigated based on the obtained results. The detailed contents of this study are listed as following:1. The jet pump performance curve and optimum area ratio equation derived from the momentum and energy equation provide reference to the design and performance analysis of the jet pump of a cavitation-prevent device.2. The flow field inside the jet pump is modeled by the aid of FLUENT to study the pressure and velocity variation of the flow inside the jet pump. The effect of choke inlet falloff angle on the pump performance is also examined and it is found that the falloff angle ranging between 20°and 45°has no significant on the jet pump efficiency and small falloff angle contributes to the occurrence of cavitation.3. Based on the simulation results, the investigation on the effect of working pressure, ejector pressure and outlet pressure on the performance of an injector pump with the cross-section ratio of 6/11 is conducted. Moreover, the relationship between the outlet pressure, suction height and the flow rate is also studied at the condition of unchanged pump lift.4. A model for predicting the performance of the cavitation-prevent device is developed based on the internal flow field and performance analysis of the jet pump. Additionally, the working law of the cavitation-prevent device under variable working condition is also studied.
|
PDF Full Text Request