The method of force defect coefficients was developed by Jobson and improved by Bragg to calculate compressible discharge coefficients for axisymmetric orifices from the more easily computed or measured incompressible values. This method has been adapted to deal with two-dimensional flow, and the analysis for a particular case, that of compressible jet flow emerging from an asymmetric straight-sided orifice, has been completed.
Predictions of jet angle and thickness have been calculated for a range of orifices, and these are shown to compare well with experimental measurements.
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