分层流体中栅格湍流的特性

The present experimental study investigates the properties and evolutions of grid turbulence in stratified fluid. By moans of computer image proccesing of particle streak pattern and relavent statistics, it is possible to obtain the flow structure details, turbulence decay of kinetic energy, various turbulent lengthscales, dissipation rate and spectrum. The experimental results further confirm the conclusion that the stratification of fluid mainly supre-sses the vertical turbulent velocity (increases its de...