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This paper presents a new experimental bench which allows the characterization of different fast switching valves in terms of flow rate and free air jet generation. By using this new bench, it is possible to study the different phenomena that may occur in the inner and outer circuits from the source up to the free jet. The different sensors positioned at key points along the air circuit allow the determination of the flow characteristics as well as the dynamic behavior of the different components during the generation of the pulsed air jets. By the tests performed with a fast spool-sleeve valve, it was possible to determine its flow characteristics (sonic conductance and critical pressure ratio). These values were used to build an average mass flow rate curve which is compared to the one measured by using a flowmeter during dynamic tests. This comparison enables to evaluate the limit frequency up to which the steady state flow characteristics can be used to estimate the average mass flow rate during dynamic operation. The next step consists in exploring the jet in a 3D space by using a 5-hole probe which provides the information on pressure, temperature and velocity necessary to determine the most suitable zone to perform object sorting with the jet. Also its unsteady behavior can be observed allowing the identification of the limit frequency at which the jet efficiency starts to decrease.

Fast switching pneumatic valves: experimental bench for flow and pulsed air jet characterizations