A New High Supply Pressure Pneumatic Flapper-Nozzle With Linear Behavior

Abstract

In order to optimize the devices which incorporate flapper-nozzle systems, the behavior of these systems must be completely modeled theoretically. However, the complexity of the flow between the nozzle and the flapper generally requires an empirical calibration of the discharge coefficients. In this article we will propose two types of flapper-nozzle designs which make completely theoretical determination of steady flow possible. This is required for device optimization. The second design makes it possible to obtain strictly linear behavior, which offers several advantages compared to classic devices. The results of experimental testing correspond closely to the theoretical predictions.