A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Venturi-tubes: improved shape
Three Venturi tubes have been manufactured, and four Venturi tubes calibrated in water and high-pressure gas. All were of diameter 100 mm and had diameter ratio 0.6, but they had different profiles for the convergent The data have been presented against a function of throat-tapping-hole Reynolds number. The agreement between water and gas data is very good. The standard deviation of the data about the best-fit line has been determined for each set of the new data and for each set of data from previous projects with the same diameter and diameter ratio but different convergent profiles. The best convergent profile has been determined to be one with a 10.5 deg included angle with sharp comers on the basis that it gives the lowest standard deviation of the data about the fitted line. Two other venturi tubes with this particular profile have already been calibrated in water and gas; when they were evaluated in the same way the standard deviations of the data about best-fit lines were low. Moreover, for all three the slope of the line fit was very similar. It has therefore been decided that additional Venturi tubes of diameter 50 mm and 150 mm should be manufactured with a 10.5 deg included angle and sharp comers where the convergent meets the throat and the upstream cylinder. The three Venturi tubes manufactured within this project had single pairs of tappings of diameter 1 mm (except for one Venturi tube), 2 mm, 6 mm, and 8 mm and four pairs of tappings of diameter 4 mm. Data could be colleded with a single pair of 4 mm tappings or using all four pairs connected in triple-Ts. All the work to determine the best profile used 4 mm tappings in triple-Ts. The same process of evaluation used to determine the best profile showed that 8 mm tappings and, to a lesser extent, 6 mm tappings gave- performance than small sizes. Moreover, the data colleded with different tapping hole sizes helped to confirm that an equation based on a static-hole-error model is appropriate. The additional Venturi tubes to be manufactured will therefore have a single pair of tappings of diameter 2 mm and four pairs of tappings of diameter 4 mm.
Venturi-tubes: improved shape
Three Venturi tubes have been manufactured, and four Venturi tubes calibrated in water and high-pressure gas. All were of diameter 100 mm and had diameter ratio 0.6, but they had different profiles for the convergent The data have been presented against a function of throat-tapping-hole Reynolds number. The agreement between water and gas data is very good. The standard deviation of the data about the best-fit line has been determined for each set of the new data and for each set of data from previous projects with the same diameter and diameter ratio but different convergent profiles. The best convergent profile has been determined to be one with a 10.5 deg included angle with sharp comers on the basis that it gives the lowest standard deviation of the data about the fitted line. Two other venturi tubes with this particular profile have already been calibrated in water and gas; when they were evaluated in the same way the standard deviations of the data about best-fit lines were low. Moreover, for all three the slope of the line fit was very similar. It has therefore been decided that additional Venturi tubes of diameter 50 mm and 150 mm should be manufactured with a 10.5 deg included angle and sharp comers where the convergent meets the throat and the upstream cylinder. The three Venturi tubes manufactured within this project had single pairs of tappings of diameter 1 mm (except for one Venturi tube), 2 mm, 6 mm, and 8 mm and four pairs of tappings of diameter 4 mm. Data could be colleded with a single pair of 4 mm tappings or using all four pairs connected in triple-Ts. All the work to determine the best profile used 4 mm tappings in triple-Ts. The same process of evaluation used to determine the best profile showed that 8 mm tappings and, to a lesser extent, 6 mm tappings gave- performance than small sizes. Moreover, the data colleded with different tapping hole sizes helped to confirm that an equation based on a static-hole-error model is appropriate. The additional Venturi tubes to be manufactured will therefore have a single pair of tappings of diameter 2 mm and four pairs of tappings of diameter 4 mm.
Venturi-tubes: improved shape
Venturi-Rohre: verbesserte Form
Reader-Harris, M. (author) / Brunton, W. (author) / Hodges, D. (author) / Nicholson, I. (author)
2003
15 Seiten, 18 Bilder, 4 Tabellen, 11 Quellen
Conference paper
English
Pressure losses in venturi tubes
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