A computational model on the basis of the combination of the full cavitation model and the modified re-normalization group (RNG) k-ε turbulence model are used to simulate the cavitating flow in a centrifugal pump at ...A computational model on the basis of the combination of the full cavitation model and the modified re-normalization group (RNG) k-ε turbulence model are used to simulate the cavitating flow in a centrifugal pump at a low flow rate. A filter function is introduced for the RNG k-ε turbulence model in order to consider the compressibility in the cavitating flow. The calculated values of the net positive suction head available (H NPSHa ) agree well with the experimental measurements. The cavities in the impeller are obtained and their evolvement with H NPSHa are revealed.展开更多
The paper refers to the analysis of interactions between the impeller and the vaned diffuser based on the air model of a radial flow pump.The study deals with a numerical simulation of the flow for a full 360°ent...The paper refers to the analysis of interactions between the impeller and the vaned diffuser based on the air model of a radial flow pump.The study deals with a numerical simulation of the flow for a full 360°entire impeller and diffuser.The task is carried out closely under the design operating conditions and for one particular position of the impeller blade with respect to the diffuser frame.Among all the results,the focus is mainly on the flow pattern at the exit part inside the impeller facing the diffuser vanes.The results are compared to the available PIV measurements.展开更多
基金supported by the National Natural Science Foundation of China (51176088 and 51179090)the National Basic Research Program of China (2009CB724304)the Open Research Fund Program of State Key Laboratory of Hydroscience and Engineering (sklhse-2012-E-02)
文摘A computational model on the basis of the combination of the full cavitation model and the modified re-normalization group (RNG) k-ε turbulence model are used to simulate the cavitating flow in a centrifugal pump at a low flow rate. A filter function is introduced for the RNG k-ε turbulence model in order to consider the compressibility in the cavitating flow. The calculated values of the net positive suction head available (H NPSHa ) agree well with the experimental measurements. The cavities in the impeller are obtained and their evolvement with H NPSHa are revealed.
文摘The paper refers to the analysis of interactions between the impeller and the vaned diffuser based on the air model of a radial flow pump.The study deals with a numerical simulation of the flow for a full 360°entire impeller and diffuser.The task is carried out closely under the design operating conditions and for one particular position of the impeller blade with respect to the diffuser frame.Among all the results,the focus is mainly on the flow pattern at the exit part inside the impeller facing the diffuser vanes.The results are compared to the available PIV measurements.
