风生流水动力特性试验研究

从以往对太湖和其他浅水湖泊的研究来看,水流走向主要受湖泊表面的风向支配,主要运动形式是由风驱动而形成的风生流。为了研究浅水湖泊风生流的基本特性,构建了一套模拟风生流的水槽试验装置,模拟了15m/s风速下的风生流,并采用高采样频率PIV系统对风生流水动力特性进行了精细的测量,获得了风生流的垂向流场信息。试验表明该系统测量结果符合风生流的形成规律,具有模拟风生流的能力。通过不同流程处、相同风速下风生流时均流场、水平流速、涡量、紊动切应力和紊动强度垂线分布的对比,分析了风生流的水动力特性。风生流水槽试验的结果可以为今后进一步深入研究浅水湖泊风生流提供基础数据。

Experimental study on hydrodynamic characteristics of wind-driven flow

According to the previous research on Taihu Lake and other shallow lakes, the water movement is mainly affected by the direction of the wind. The form of the water movement is mainly the wind-driven flow . In order to study the basic characteristics of the wind-driven flow in shallow lakes, we established a flume experiment device to simulate the wind-driven flow at the 15 m/s wind speed. The PIV system with high sampling frequency was used to measure the precise hydrody namic characteristics of the wind-driven flow, and obtained the vertical flow field information of the wind-driven flow . The test showed that the measurement results of the system conformed to the formation law of wind-driven flow , and has the ability to simulate the wind-driven flow. By contrasting the vertical distribution of time-averaged flow field, horizontal velocity , vortex, turbulent shear stress, and turbulent intensity at different distances at the same wind speed, we analyzed the hydrodynamic charact eristics of the wind-driven flow. The results of this experiment can provide basic data for the further study on the hydrodynamic characteristics of shallow lakes.