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Title: The Performance Of Flow Nozzles At High Reynolds Number
Author: Michael Reader-Harris, Jeff Gibson, David Hodges, Ian Nicholson, Ronnie Rushworth
Source: Flomeko 2007
Year Published: 2007
Abstract: Throat-tapped flow nozzles are used for power-station performance tests, and the accuracy of measurements is therefore of great importance because of the major financial implications of mis-measurements. The performance of Venturi tubes in high-pressure gas has proved to be different from what had been expected on the basis of calibrations in water at lower Reynolds number15. The aim of this project was therefore to calibrate throat-tapped flow nozzles in water and gas and to compare the results with those given in ASME PTC 6 and thus to see how well extrapolation from a water calibration to higher Reynolds number works. Wall tappings were also inserted so that data taken with wall tappings could be compared with those taken with throat tappings. The aim of this part of this work was to check the uncertainty claim for the discharge-coefficient equation for low-ratio long-radius nozzles in ISO 5167-37.

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