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There are many applications where a compressible gas flows through an orifice or a nozzle. This complex process has been examined for long time. Nevertheless current one or two dimensional mathematic and semi-empirical theories that predict a flow of a compressible gas through an orifice during an unsteady discharge from a vessel are only partially successful. It is impossible to treat all factors that might affect such a discharge. An experimental examination of a compressible gas flow through an orifice is still important part for evaluation and prediction of a discharge coefficient. This paper brings an idea for setup an apparatus on which a broad range of properties of an orifice can be tested. Several groups of properties were tested on different types of orifices and the results are presented.

Measuring a Discharge Coefficient of an Orifice for an Unsteady Compressible Flow