壁面处湍流速度梯度脉动的测量对于深入了解壁面附近湍流的结构和传热、传质是很重要的.本文叙述了电化学法测量的原理,介绍了用一半圆电极对同时测量壁面上二维湍流速度梯度脉动的方法和测量结果.在直径0.194m的充分发展圆管湍流中,用碘和碘化钾溶液作为流动介质,半圆电极对直径为5×10~-4m,测得壁面处轴向和周向速度梯度的湍流脉动强度分别为0.3—0.33和0.11—0.12. The measurement of turbulent velocity gradient pulsation at the wall surface is very important for understanding the structure and heat and mass transfer of turbulent flow near the wall.In this paper, the principle of electrochemical measurement is described, Turbulent velocity gradient pulsation method and measurement results in the full diameter of 0.194m tube turbulence, with iodine and potassium iodide solution as the flow medium, the semicircle electrode diameter of 5 × 10 ~ -4m, measured at the wall surface axial and The turbulence intensity of the circumferential velocity gradient was 0.3-0.33 and 0.11-0.12, respectively.