A NEW HIGH SUPPLY PRESSURE PNEUMATIC FLAPPER-NOZZLE WITH LINEAR BEHAVIOR

In order to optimize the devices which incorporate flapper-nozzle syst ems, the behavior of these systems must be completely modeled theoreti cally. However, the complexity of the flow between the nozzle and the flapper generally requires an empirical calibration of the discharge c oefficients. In this article we will propose two types of flapper-nozz le designs which make completely theoretical determination of steady f low possible. This is required for device optimization. The second des ign makes it possible to obtain strictly linear behavior, which offers several advantages compared to classic devices. The results of experi mental testing correspond closely to the theoretical predictions.