Systematic study of error sources in supersonic skin-friction balance measurements
Systematic study of error sources in supersonic skin-friction balance measurements
复制标题
超声速表面摩擦平衡测量误差源的系统研究
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
J. M. Allen
中科院分区：
文献类型：
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作者：
J. M. Allen
进行了一项实验研究，以调查潜在的误差来源，获得的数据与自归零，力矩测量，皮肤摩擦平衡。天平安装在超音速风洞的侧壁上，在一定间隙尺寸和元件伸出量范围内，对天平输出的三种力（表面摩擦力、唇缘力和偏心法向力）进行了独立测量。平衡数据与这三个独立测量力的总和之间的相对良好的一致性验证了所使用的三项模型。没有发现小的间隙尺寸的优势;事实上，较大的间隙是优选的。元件与周围测试表面的完美对准导致非常小的平衡误差。然而，如果小的突出误差是不可避免的，没有优势，发现在周围的测试表面，而不是上面的元素略低于。
An experimental study was performed to investigate potential error sources in data obtained with a self-nulling, moment-measuring, skin-friction balance. The balance was installed in the sidewall of a supersonic wind tunnel, and independent measurements of the three forces contributing to the balance output (skin friction, lip force, and off-center normal force) were made for a range of gap size and element protrusion. The relatively good agreement between the balance data and the sum of these three independently measured forces validated the three-term model used. No advantage to a small gap size was found; in fact, the larger gaps were preferable. Perfect element alignment with the surrounding test surface resulted in very small balance errors. However, if small protrusion errors are unavoidable, no advantage was found in having the element slightly below the surrounding test surface rather than above it.