【摘要】 本文介绍用热膜流速仪对洩水孔进水口前立轴漩涡区的时均、瞬时、脉动流速的量测成果,提出该漩涡区的切向、径向、轴向时均流速分布规律与相应曲线;通过数据处理与分析,归纳出在不同的进水口相对淹没深度H/D和相对水深h/H的情况下,半径为Υ的涡面上三向瞬时流速的概率密度统计值、功率谱、自相关、互相关;最后分析了脉动流速的紊动强度、优势频率及相关特性。更多还原

【Abstract】 In this Paper the results measured through a hot-film velocity meter for the transient, time-average and fluctuation velocities of flow in the region of the vertical-axis vortex in front of intakes and the laws and curves of distribution on the tangential radial and axial time-average velocities in this region are presented; by analyzing the data of the statistical values of probability density, power spectrum, autocorrelation and cross-correlation of the three-dimensional transient velocities distributed on the surface of the vortex with a radius r under various relative submergences H/D and relative depths h/H (r, H, h and D shown in Fig.1) are summarized out; finally, the turbulence intensity, the predominant frequency and the correlation characteristics for the fluctuating velocities are analyzed.更多还原