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Title: Experimental Study On Critical Back Pressure Ratio Of Sonic Nozzle At Low Reynold Number
Author: Heming Hu, Chi Wang, Lishui Cui, Chunhui Li, Tao Meng
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: Sonic nozzle is the most common standard flow meter in gas flow calibration facilities, and it is necessary to test the critical back pressure ratio for nozzles whose throat Reynold numbers are smaller than 2105 , because the critical back pressure ratio is directly related to the accuracy of the facilities. A test system based on nozzle in series method has been built, with the pressure measurement instead of the mass flow rate measurement, to determine the critical back pressure ratio accurately and efficiently. Experimental results show that the critical back pressure ratio is smaller than the designed value for nozzles at low throat Reynold number, and that the smaller the throat Reynold number, the lower the critical back pressure ratio. Probable premature unchoking phenomena can cause further decrease of the critical back pressure ratio, and the degree of the ratio decease is related to the manufacturing level of the nozzles, which also explains the necessity of critical back pressure ratio test

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