Abstract：In order to improve the flow measurement accuracy of the new ultrasonic square measuring flume under the condition of non-submerged outflow, hydraulic contraction sections were added before and after the square flume and hydraulic formula was introduced to assist the flow measurement. Finally, the flow error comparison test was carried out with the triangular weir. Results show that the flow measurement error of square channel without contraction section is less than 8% under the condition of submerged outflow; the flow measurement error of square channel with contraction section is less than 8% when the flow rate is greater than 0.1 m3/s, and the calculation error of flow formula in the contraction section is less than 5% when the flow rate is less than 0.1 m3/s. The method of flow measurement assisted by contraction section and hydraulic formula can improve the accuracy of flow measurement of square channel under the condition of non-submerged outflow, furthermore, the applicability of the square channel is improved. It lays a foundation for the application of ultrasonic square measuring flume in actual water measurement. This new type of flume with high precision, strong adaptability and simple flow measurement can save the manpower and material resources needed for open channel water measurement, and promote the construction process of information water measurement in irrigated areas.
付博,何新林*,陈金水,赵丽,邓小来,辛博. 新型超声波方形量水槽测流误差试验研究[J]. 排灌机械工程学报, 2021, 39(4): 372-378.
FU Bo,HE Xinlin*,CHEN Jinshui,ZHAO li,DENG Xiaolai,XIN Bo. Experimental study on flow error of a new type of ultrasonic square flume. Journal of Drainage and Irrigation Machinery Engin, 2021, 39(4): 372-378.
