Particle Response to Fluid Turbulence: A Novel Approach to Measuring in the Particle-Lagrangian Coordinate System

这是C.Rogers(塔夫茨大学)和J.Eaton(斯坦福大学)。提出了一种实验-数值模拟相结合的方法来取代LDV系统中的控制体积，将其视为湍流场中的粒子。LDV系统将使用主动控制回路。确定了粒子-拉格朗日坐标系中流体速度的自相关，以及同一点上粒子和流体的脉动速度之间的关联。所得数据与目前仅适用于低雷诺数湍流的直接数值模拟结果相似。所得结果可用于两相流中各种理论和数值模拟的校正。简化了实验条件：只模拟点状颗粒，颗粒不影响流动，试验区域为二维，考虑了颗粒形状和尾迹的影响。本项目可能在理解和模拟各种工业过程中的高雷诺数下的分散两相流方面取得重大进展。

This is a collaborative project between C. Rogers (Tufts U.) and J. Eaton (Standford U.). A combined experimental-numerical simulation approach is proposed to displace the masuring control volume of an LDV system as it were a particle in a turbulent field. The LDV system will use an active control loop. The fluid velocity autocorrelations in a particle-Lagrangian reference frame, and the correlations between the fluctuating velocities of the particle and the fluid at the same point, will be detrmined. The obtained data are similar to the results derived from direct numerical simulations, which currently are feasible only at turbulent flow with low Reynolds numbers. The results may be useful to calibrate various theories and numerical simulations in tow phase flows. The conditions of the experiment are simplified: only point particles are simulated, particles do not affect the flow, the testing domain is two- dimensional, the effects of particle shape and wake are considered. The present project may lead to significant advances in understanding and modeling disperse two-phase flow at high Reynolds numbers of interest in various industrial processes.