When a pump station is built, the pump sump is very important, which directly affects the efficiency and safety of the pump station. The most important thing is to reduce the vortex in the flow of the sump, because the vortex is the primary reason which could cause vibration, cavitation and the decrease of the efficiency of the pump station. All of these can exacerbate the performances of pump. Although the flow conditions in the sump are very tomplex and it is impossible to avoid fully the vortex, the vortex generally distribute around the pump bell, their generation relies on the construction of the sump and the pump bell, and their generation is also related to the moving conditions of the pump. So we have designed a model pump sump with special dimensions in order to reduce the vortex in the flow of the sump. The propose of our experiment is to measure the internal flow field in the model of closed pump sump with special dimensions under five typical conditions of the pump with PIV. The PIV technology is an important mean among the flow measurement instruments, its result appears roundly the overall flow status in the measurement side, overcoming the limits that traditional measurement could only measures one-point. By PIV we have obtained the datum about the velocity distribution, streamline distribution, velocity variance, turbulent kinetic energy and so on. Now we know the distribution of the vortex in the whole flow field in the sump from these datum. On the base of all these work, we have done some improving design, adding a T-type baffle below the pump bell to reduce the possibility that the vortex generates, we have done again the experiment to check the effect of this model with improving design with PIV, the results and the data we have got certify that this model pump suction sump with a T-type baffle has good performances under kinds of conditions, it is important for reducing vibration, decreasing cavitation and increasing efficiency of pump station.
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