Abstract
The development of fluid-meter nozzles for the precise measurement of turbine condensate during performance tests in central stations has been stimulated by the fact that in a number of cases the usual weigh-tank installations have not been made. A group of flow nozzles which has been used in such cases is described in this paper. The results of the calibrations of these nozzles are presented and compared with those of some other experimenters.
The calibration results show that the flow coefficients of all the nozzles of the group can be represented as a single function of Reynolds’ number with an accuracy of a little better than ±½ per cent in flow coefficient.
The comparison of the calibration results with those on other nozzles shows that the nozzles with a gradual approach curve and an appreciable length of cylindrical throat have coefficients which change less abruptly with changing Reynolds’ numbers than nozzles with rapidly curving approach and short parallel throat.
