论文部分内容阅读
1 概要 最近,美国地质调查局(USGS)对世界上通用于河流测量的几种流速仪性能进行了野外与实验室比测。进行比测的流速仪具体情况如下:水平轴式流速仪分别来自德国、联合王国(英国)和中华人民共和国;垂直轴式流速仪与电磁式流速仪来自美国。本报告总结的结果是有关流速仪重复性、线性及斜流角度响应的实验室比测和初步的野外比测。从比测结果来看,随着水流速度增加和水流与旋桨轴向夹角增加,所有比测流速仪都存在着对实际流速的高估或低估问题。在
1 Summary Recently, the United States Geological Survey (USGS) conducted a field-to-lab test of several of the world's current-flow meter properties commonly used in river measurements. The specific conditions of the anemometer for comparison are as follows: The horizontal axis type flow meters are from Germany, the United Kingdom (United Kingdom) and the People's Republic of China respectively; the vertical axis type flow meters and the electromagnetic type flow meters are from the United States. The results summarized in this report are laboratory measurements and preliminary field measurements of the velocity, repeatability, linearity and skew angle response. From the comparison results, with the increase of water flow rate and the increase of the axial angle between water flow and propeller axis, all ratio anemometers have the problem of overestimation or underestimation of the actual flow rate. in