消力池导墙脉动壁压的正交分解与低阶近似

Proper orthogonal decomposition and low dimensional approximation of the wall-pressure fluctuation acting on the apron of the stilling pond

为进一步了解水流作用于消力池导墙上脉动压力的特性,通过模型实验获得了作用于消力池导墙上的脉动壁压信号,讨论了消力池导墙脉动壁压的统计特性。将正交分解与低阶近似方法引入到消力池导墙脉动壁压的研究中。实验与计算结果表明,作用于消力池导墙上的脉动压力强度的最大值与上、下游水位差有关,而且消力池导墙上脉动压力时均信号可以用正交分解进行描述。

The wall pressure fluctuation acting on the apron of the stilling pond was studied experimentally in order to understand its characteristics. The statistic characteristics of it were studied in the paper. Moreover, the method of proper orthogonal decomposition and low dimensional approximation was used to the research. The results of model test and calculation made it clear that the intensity maximum of the wall-pressure fluctuation was related with the difference of the water level between upstream and downstream. In addition, the time-average signals of wall-pressure fluctuation acting on the apron of the stilling pond could be described with the method of proper orthogonal decomposition.