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Many experiments have proven that with increasing silt and gas(out-of-phase media)content in water,the cavitation characteristics change and the cavitation pressure increases.Currently,many large reservoirs in China are polluted by total phosphorus(TP)and other chemical contaminants because of the use of phosphate fertilizer runoff from agriculture.However,research regarding how chemical pollutants(in the form of out-of-phase media)affect the cavitation pressure characteristics of water is sparse.In this paper,the Goupitan Hydropower Station,the largest hydropower reservoir on the Wujiang River,which is heavily polluted by TP,is taken as an example to evaluate the effects of chemical pollution on water cavitation pressure characteristics.In this study,the cavitation pressure characteristics of polluted and clean water are compared.The results show that the cavitation pressure of water polluted by chemicals is larger than that of clean water.In a hydraulic power generation system,cavitation and cavitation erosion are likely to occur earlier in runners when the fluid is polluted.These results are of great importance to further studies of cavitation theory and can directly influence the arrangement of turbines in practical engineering. 相似文献
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韦金石 《南方冶金学院学报》1997,18(1):75-80
在求旋转体积的古鲁金定理的启发下,本文给出了沿一条曲线,用它的法平面去截一个立体,算出了截得图形的面积,再应用曲线积分来计算此立体的体积的方法。 相似文献
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JinShi Chang 《中国科学E辑(英文版)》2009,52(6):1804-1808
The experiment result in this article shows that the initial and critical cavitation pressure of pure water are both increasing
along with the increase of height above sea level, and the ionization strength of cosmic rays in the lower aerosphere is the
crucial factor which influences the cavitation pressure of pure water. The author concludes the relationship between the cavitaion
pressure of pure water and the height above sea level. Moreover, air particles in water caused by the radiation of cosmic
rays can exist in the water for a long time and will not escape. 相似文献
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