音速ノズル流出係数のレイノルズ数依存性の簡易相対測定法

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  • Simplified Method to Measure the Reynolds Number Dependence of the Discharge Coefficient of a Critical Nozzle
  • オンソク ノズル リュウシュツ ケイスウ ノ レイノルズスウ イゾンセイ ノ カンイ ソウタイ ソクテイホウ

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A novel method to measure the Reynolds number dependence of the discharge coefficient of a critical nozzle relatively against the other critical nozzles is proposed. The method uses three or more series connections of 2 nozzles among the reference and the test nozzles. The two constants, which control the Reynolds number dependence of the discharge coefficient, are derived from comparing the pressure between nozzles in these series connections. The upper condition is kept constant near a reference condition, therefore realization of the facility and performance of the measurement are quite simple. The only instrument the method requires is a pressure gauge which has only a linearity in a narrow range. Its sensitivity is measured utilizing a stable pressure ratio generated by a series connection of two critical nozzles. All of the measured pressure are appeared as ratios in the equations to calculate the two constants, therefore error caused by a zero-shift of the pressure gauge is negligible. An uncertainty analysis and realized measurements on critical nozzles of different designs confirmed its high accuracy in very short measuring time.

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