분리형 날개 지지격자 후방 봉다발에서의 유동 구조 측정

An experimental investigation of the flow structures in rod bundles with the air test model for the split vane spacer grid has been performed. Three dimensional velocity distributions and turbulent intensities over a central subchannel are measured at the Reynolds number of 120,000 by using pitot tube and hot wire anemometry. The rods were arranged in a square array with a pitch to diameter ration of 1.33. The strong cross flow appears in the gap region of central subchannel in rod bundle with split vane spacer grid. The parameters of turbulent intensity, turbulent diffusion coefficient, cross flow factor and swirl factor reduced from measurement are consistent with the previous test results.