矩形渠道平板量水装置测流试验研究.

The irrigation area is the key technology for the precision irrigation and charging of the irrigation area. Based on the momentum theorem, this paper designed a new type of device for measuring water flow in open channel. This paper explored the difference of hydraulic properties among different shape flats, and looked for the optimal geometric shape of flat. Using statics analysis on flats in narrow and deep rectangular open channel uniform flow, we found that the relationship between quantity of flume and opening angle of testing flat had a single value corresponding. Combined with experiment outcome in laboratory, for different geometries and shrinkage ratios flats we extrapolated the half theoretical and half empirical formula of flow and range of application. Compared experiment results of designed testing flat, such as, flow range, the measurement error, head loss and flow stability, we concluded that T-shape flat with shrinkage ratio of 0.5 to 0.6 was recom mended. [ABSTRACT FROM AUTHOR]