The effective barrier to indoor storm hit, with wind rain, due to the reflection of the airflow, even if the air conditioning is not turn off the screen, can be a free exchange of fresh air.
有效阻隔风雨对室内的侵袭，具有防风挡雨的功能，由于气流的反射作用，即使开空调也不用关闭纱窗，可自由交换新鲜空气。
Angle of ATTACK, the Angle of the wing chord in relation to the free stream airflow as it moves forward through the air.
迎角，机翼翼弦在空气中向前运动时与自由气流之间的夹角。
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.
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。
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