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Title: The Critical Back Pressure Ratio Of Sonic Nozzles - The Correlation With Diffuser Geometry And Gas Composition
Author: Bodo Mickan, Rainer Kramer,Chunhui Li
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: The critical backpressure ratio (CBPR) of sonic nozzles is one of the parameters which are important for the correct application. The CBPR indicates the minimum pressure loss achievable during the use of a nozzle in a test configuration. The conventional design of sonic nozzles, especially those of nozzles according to the ISO 9300, with conical divergent sections (diffusers) is specified to optimize this CBPR. It is a well-known fact that the individual CBPR of a nozzle depends on many parameters such as diffuser angle, length of diffusers, size of nozzle, operating pressure and gas composition. Another well-known fact concerning the CBPR of sonic nozzles is the phenomena of the premature unchoking which occurs especially in applications of small sonic nozzles

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