几种矩形二维柱体节段模型上脉动力的测量

Measurements of Fluctuating Force on 2-Dimensional Models of Rectangular CylinDers

本文运用一种气动力直接测量方法在风洞的平滑流中测量了几种不同高宽比的二维矩形柱体上的脉动力，给出了它们的脉动升力系数的均方根值及斯特洛哈数，测量到在高宽比为０．７的柱体上有旋涡脱落诱发的顺风向脉动力。当风速变化时，顺风向脉动力的主导频率等于脉动升力频率或为其倍频。

A strain balance was used to measure fluctuating force on several rectangular cylinder models in smooth flow.RMS lift coefficients and Strouhal Numbers of these models are given.Linear relationships between H/B and RMS lift coefficients,and also Strouhal Number were found Fluctuating force in along-wind direction caused by vortex-shedding is observed on the model with 0.7H/B. The frequencies of along-windfluctuating forces are equal to or double those of cross-wind fluctuatingforces for different wind speeds.