The turbulent flow in open channel is tested with laser - doppler anemometer , in which the longitudinal time average velocity and fluctuating velocity of turbulent flow in open channel under the conditions of the sudden changes of roughnesses at different water depths are measured 摘要通過激光測速儀,對壁面糙率突變時的明渠紊流進行試驗,測量了糙率突變不同水深情況下明渠紊流的縱向時均流速和脈動流速。
Under different positions of a tripping wire or speeds of the side jet , the controlled experiments were made , including the receptivity of the shear layer near jet exit to acoustic excitations , the spatial development of fluctuating velocity and the profiles of mean velocity 在不同絆線位置或不同旁射流流速條件下,研究了射流出口臨近剪切層對聲激勵的感受性,脈動流速向下游的空間演化及平均流速剖面。