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气液两相流供水管道停泵水锤计算及防护研究 被引量:6
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作者 王彤 赵红斌 +5 位作者 李钟毓 王晴怡 康炳卿 刘欢 许德伦 洪磊 《人民黄河》 CAS 北大核心 2023年第6期117-122,132,共7页
为对输水管道内气液两相流时停泵水锤工况进行模拟研究,根据水锤基本理论,通过对系统内气液两相流流态的合理简化,搭建水锤计算模型,选取工程实例,进行最不利工况下的模拟计算。结果表明:突然停泵会在管道中产生严重的断流弥合水锤现象... 为对输水管道内气液两相流时停泵水锤工况进行模拟研究,根据水锤基本理论,通过对系统内气液两相流流态的合理简化,搭建水锤计算模型,选取工程实例,进行最不利工况下的模拟计算。结果表明:突然停泵会在管道中产生严重的断流弥合水锤现象,最大超压约71 m;管道含气5%时比不含气状态的水锤压力水头高出10~40 m,且水锤波周期变长,收敛性更差。针对工程实例进行水锤防护分析,对“快关止回阀+气压罐”“缓闭止回阀+气压罐”“缓闭止回阀+箱式双向调压塔”3种防护措施进行比较,得出采用“缓闭止回阀+箱式双向调压塔”可以有效缓解管网水锤压力、保障管网正常稳定运行的结论。 展开更多
关键词 气液两相流 停泵水锤 水锤计算模型 水锤防护
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Calculation of Significant Wave Height Using the Linear Mean Square Estimation Method 被引量:2
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作者 GAO Yangyang YU Dingyong +1 位作者 LI Cuilin xu delun 《Journal of Ocean University of China》 SCIE CAS 2010年第4期327-332,共6页
Significant wave height is an important criterion in designing coastal and offshore structures.Based on the orthogonality principle, the linear mean square estimation method is applied to calculate significant wave he... Significant wave height is an important criterion in designing coastal and offshore structures.Based on the orthogonality principle, the linear mean square estimation method is applied to calculate significant wave height in this paper.Twenty-eight-year time series of wave data collected from three ocean buoys near San Francisco along the California coast are analyzed.It is proved theoretically that the computation error will be reduced by using as many measured data as possible for the calculation of significant wave height.Measured significant wave height at one buoy location is compared with the calculated value based on the data from two other adjacent buoys.The results indicate that the linear mean square estimation method can be well applied to the calculation and prediction of significant wave height in coastal regions. 展开更多
关键词 significant wave height linear mean square estimation method orthogonality principle
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