Calibration of Critical Nozzles Against Another One Connected in Series and Its Application.
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概要
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Two of several critical nozzles were connected in series to calibrate the downstream one at low pressure against the upstream one kept at the atmospheric pressure. The measured discharge coefficients of Venturi nozzles machined by super-accurate lathes distributed along a fitted curve, which had been measured with homologous nozzles using a constant volume tank system at the atmospheric pressure, with deviations of less than ±0.04%. The discharge coefficient of quadrant nozzles had a smaller Reynolds number dependence than those of Venturi nozzles. Stability of the critical flow of the downstream nozzles was measured with varying their downstream pressure in the same configuration. Flow rates of all the nozzles with the throat diameters of 0.5-13.4mmφ with the Reynolds number of 1.7×103-8.6×104 did not vary more than ±0.02% when they are in the critical condition. Their critical pressure ratios decreased suddenly from certain values near the theoretical ones to 0.5 when the Reynolds numbers are decreased, but they remained at around 0.5 with the Reynolds number down to 1.7×103. Detachable diffusers for short nozzles were shown to be effective to make their characteristics similar to those with integrated diffusers in spite of a small step at the contact plane. A new method to test a flowmeter at various volume flowrates by using only one critical nozzle is shown to be possible by controlling the pressure at the upstream of the nozzle.
- 公益社団法人 計測自動制御学会の論文
公益社団法人 計測自動制御学会 | 論文
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