高坝挑流冲刷坑中掺气水流的流速量测及其特性分析

Measurement and Analysis of Aerated Flow Velocity in Scour Hole of High Dam Jet Flow

本文研究了利用热膜技术量测掺气水流的时均流速和紊动结构有关的技术问题，首次成功地量测了三峡溢流坝模型冲坑中掺气水流的时均流速与脉动流速，并对脉动流速和脉动压强的相关关系作了分析研究，把目前冲坑水流特性的研究推进了一步。

This paper deals with the measurement of time averaged velocity of aerated flow and its turbulent structure by using the hot film technology.This technique is successfully applied for the first time to the measurement of time averaged velocity and impulsive velocity of aerated flow in the scour hole for the Three Gorge spillway dam model.The regression relation between impulsive velocity and impulsive pressure is discussed.The technique proposed in this paper has promoted the current research on fluid flow characteristics in scour holes.It has theoretical and practical significance for the study of energy dissipation mechanism in aerated flow.