Modelling of the Operating Circuit of Main Nozzle for Air-jet Looms

摘要

This work relates to the development of a simplified analytical model describing the driving circuit of a main nozzle for air-jet looms. The model is intended as an instrument to quickly evaluate the influence of various parameters, such as pipe dimensions, valve regulations and opening/closing timing of valves, on air consumption and performance. A lumped parameter model of the system, based on the knowledge of sonic conductance and critical pressure ratio of all components, was implemented. The flow characteristics needed for simulation were experimentally determined, according to the Standards. In order to validate the model, numerical results were compared to experimental ones. The modelling methodology described is general and can be applied to circuits other than that studied herein.