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Title: The Influence Of Stagnation Pressure On Discharge Coefficient Of The Sonic Nozzle
Author: Peijuan Cao Chunhui Li Han Zhang
Source: Flomeko 2016
Year Published: 2016
Abstract: FLOMEKO 2016, Sydney, Australia, September26 - 29, 2016 Page 1 The i nfluence of stagnation pressure on discharge coefficient of the sonic nozzle Peijuan Cao 1 , 2 , Chunhui Li 1 , Han Zhang 1 1 National Institute of Metrology (NIM), caopj @nim.ac.cn , Beijing, P. R. China 2 Hebei University, Baoding, P. R. China E - mail (corresponding author): lich@nim.ac.cn Abstract W ithin the stagnation pressure of (0.12.5) MPa , t he discharge coefficients of the sonic nozzles with throat diameter of (1.92112.444) mm were investigated . T he experimental results showed that: ? T he discharge coefficient could be change d 2% for the same nozzle at d ifferent stagnation pressure ? Except for the smallest sonic nozzle , the boundary layer transition from laminar to turbulent all occurred. Unlike previous studies that the boundary layer transition tak ing place at the Reynolds number of between ( 1 E+062E+06) , t he boundary layer transition showed obviously advance for some nozzle s , which showed significantly relationship with the throat diameter. Based on the experimental results of 16 nozzle s , the curve fitting between the Reynolds number for the transition of the boundary layer and the throat diameter was conducted. When the curve fitting was extrapolated to NMIJ - 2013s results, the consistency wa s very good, as shown in

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