Verifica di campo del misuratore a cilindri in un canale rettangolare a fondo orizzontale

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Abstract

[automatically translated] The measuring cylinder is a simple tool for the determination of the water flow in flow in a rectangular channel. The instrument consists of two half-cylinders with vertical axis placed in adherence to the channel walls so as to determine a partial obstruction to the outflow. The shrinking presence causes a regurgitation upstream where the measurement of the tie rod allows, by means of a special report, to determine the fluid flow rate. In memory it is presented with a field verification of the meter roller site operation in the experimental area of Sparacia in Sicily. The gauge is inserted in a channel zero slope of 12 cm wide and is characterized by a throttling ratio equal to 0.5. Downstream of the measuring cylinder is placed in a venturi for channels for measuring the flow rate flowing out. The guy values are obtained using an ultrasonic level meter. The surveys, conducted with temporal patterning minute, refer to the period December 2004 - March 2012. The first memory shows the comparison between these measures and the proposed report Baiamonte and Iron (2007), obtained through dimensional analysis and the incomplete dell'autosimilitudine approach, highlighting a systematic underestimation of the flow and, consequently, the need for recalibration. Subsequently it presented a check of proposed report from Carollo et al. (2015), which derives from the application of Bernoulli's theorem between the upstream section of the instrument and that the critical state where it is established, in the cases of meter semi-modular behavior. In particular, Carollo et al. (2015) have postulated that, due to the linearity of a power loss, the control section does not coincide with the restricted section but, in this respect, is moved further downstream where the current regains the linearity characteristics. According Carollo et al. (2015), compared to the restricted section, the width of the control section increases with the ratio between the water depth upstream and the width of the narrow section. The analysis of field measurements confirmed the validity proposed by Carollo et al. (2015). the width of the control section increases with the ratio between the water depth upstream and the width of the narrow section. The analysis of field measurements confirmed the validity proposed by Carollo et al. (2015). the width of the control section increases with the ratio between the water depth upstream and the width of the narrow section. The analysis of field measurements confirmed the validity proposed by Carollo et al. (2015).
Original languageItalian
Pages195-204
Number of pages10
Publication statusPublished - 2015

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