초공동 고속 캐비테이션 터널 구동펌프 개발

Abstract

In order to develop the driving pump for High-speed Cavitation Tunnel(HCT) which can experiment the super-cavitating submerged body, KRISO decided on the pump specification, designed the mixed-flow pump on the basis of the existing waterjet pump and predicted the performance of the design pump using commercial CFD code (CFX-10). After the manufacture and installation of the driving pump, KRISO conducted the trial-test for HCT, analyzed the pump performance and compared trial-test results to those of design stage. The trial-test items for the HCT driving pump are measurements of output current/voltage at the inverter of the driving pump and the flow velocity in the HCT test section using LDV system. The testresults showed the decrease in the flow rate of about 4.6% and the increase in pump head of about 8%, compared with those of the pump specification. The performance of the driving pump is predicted using CFX-10 with measured flowrates andpump rotational velocities. Though there is some difference between trial-test and calculated results due to inadequate motor data, it is thought that the tendency is right. It is found that CFX-10 is useful to predict a mixed-flow pump.