自由流速度是一个交通工程术语，指不受上下游条件影响的交通流运行速度。
随着风洞宽高比的减小，断面内中垂线上的气流摩阻速度与自由流速的比值以及受风洞边壁影响的气流厚度均增大。
Both the ratio of friction velocity to free stream wind velocity and the thickness of airflow are subject to the sidewall effect, showing the increase trend with the decreasing aspect ratios.
首先应用自由尾流分析技术来计算旋翼尾迹和发动机绕排流空间的洗流速度。
First, free wake analysis was carried out to calculate the rotor wake geometry and the downwash around the engine jet space.
前言： 目的：探讨自由基、脑血流速度与蛛网膜下腔出血后脑血管痉挛的关系。
Objective: To investigate the relationship of free radical, cerebral blood flow velocities and cerebral vasospasm (CVS) following subarachnoid hemorrhage (SAH).
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