The article describes experimental and numerical investigation of discharge coefficient of end-holed nozzles. Experiments have been held on a national standard of mass flow rate at Federal State Unitary Enterprise “All-Russian Research Institute of Flow Metering”. As a result a dependence of discharge coefficient of end-holed nozzle and orifice on Reynolds number and relative diameter has been acquired. Numerical investigations have been held using contemporary CFD methods. Article contains results of mathematical modeling of discharge coefficient of ISA 1932 nozzle for a standard mounting thus proving the ability of its calculation within uncertainty of an appropriate standard. Also article gives the comparison of the result of numerical modeling and experimental investigation. Deviation of the calculated vales on and experimental values for a turbulence models with a standard set of constants for a Reynolds number more than 105 does not exceed 1,5 %. Better A satisfactory agreement between the experimental and calculated data has been obtained by modifying constants in turbulence models.
расход газа, торцевое сопло, эталон массового расхода газа, коэффициент истечения, неопределенность измерений, число Рейнольдса, относительный диаметр, математическое моделирование, модели турбулентности, стандартное сопло, gas flowrate, end-holed nozzle, mass flowrate standard, discharge coefficient, measurement uncertainty, Reynolds number, relative diameter, mathematic modeling, turbulence model, standard nozzle
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