The mean speed characteristics of several X-type v'/U-meters having widely varied dimensions were measured in order to verify assumptions usually made regarding the range of linear characteristics for meters of this type.ududUsing the same meters, and other meters with intermediate sizes, values of v'/U were measured in the turbulent fields behind three grids. Comparison of the results gave a qualitative indication of the effect of meter size on turbulence measurements.ududA length correction for the X-type meters used was derived and the turbulence values corrected, with the result that all meters gave approximately the same answers.ududHowever, even after application of the length correction, it was found that in the turbulent field behind grids (generally assumed to be isotropic) v'/U was consistently lower than u'/U at a given distance behind the grid. This result is the same as that described by Corrsin in ref. (4) where no length correction was applied.ud
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机译：测量了几种尺寸变化很大的X型v'/ U型仪表的平均速度特性，以验证通常针对此类仪表的线性特性范围所做的假设。 ud ud使用相同的仪表，以及其他在中等大小的仪表中，在三个栅格后面的湍流场中测量了v'/ U值。结果的比较给出了仪表尺寸对湍流测量的影响的定性指示。 ud ud得出了所用X型仪表的长度校正并校正了湍流值，结果所有仪表给出了大致相同的答案 ud ud但是，即使在应用长度校正之后，也发现在网格后面的湍流场（通常假定为各向同性）中，v'/ U在网格后面的给定距离处始终低于u'/ U 。该结果与参考文献Corrsin中描述的结果相同。 （4）没有应用长度校正的地方。
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