【摘要】 振动格栅是一种研究紊流特性的有效实验手段.以往研究大都在水箱中对振动格栅紊流特性进行实验研究,为能模拟天然河道中的紊流,研究天然河道中紊流特性,利用ADV技术在水槽中对振动格栅紊流进行了实验研究.研究结果表明:均方根速度与格栅振动频率成线性关系;均方根速度与距格栅中平面的距离成幂指数关系衰减;几何系数与水的自由运动空间成正比关系.更多还原

【Abstract】 Oscillating-grid is an effective experimental method to study the characteristics of turbulence.The previous researches have been done experiments mostly in the water tank.In order to simulate turbulence of flow in river and research its characteristics,the characteristics of turbulence are studied by experiments in the water channel with ADV technique.The research results indicate that R.M.S.velocity linearly relates to the oscillating-grid frequency;R.M.S.velocity decays by power exponent relates to the distance from the grid midplane;and the relationship between the geometrical factors and the free movement space of water is direct proportion.更多还原