紊流边界层脉动壁压研究

INVESTIGATION OF THE FLUCTUATING WALL-PRESSURE OF TURBULENT BOUNDARY LAYER

通过试验获得了紊流边界层脉动壁压信号,讨论了不同雷诺数条件下水流脉动壁压的统计特性,并对实测的脉动壁压进行了正交分解与低阶近似的研究.计算结果表明,紊流边界层的脉动壁压可用正交分解进行描述,其特征值随阶数的增加而减小,说明雷诺数越高,紊流中含能模态的激发越多.对脉动壁压进行低阶近似所须的阶数也与雷诺数的大小有关.

Based on the signal of the fluctuating wall-pressure of turbulent boundary layer by experiment,the statistical characteristics of the fluctuating wall-pressure of turbulent boundary layer of the flows with different Re were disscussed in this paper.And the proper orthogonal decomposition and low dimensional approximation method was used for the experimental data.The results showed that the fluctuating wall-pressure of turbulent boundary layer could be discribed with the proper orthogonal decomposition method.The characteristic value decreased when the modes increased.And the modes needed in the low dimensional approximation was related with Re.