Study of the Pressure Distribution on Nozzle Inner Wall

The nozzle,of which the efficiency has direct effects on the performance(such as endurance and speed) of watercraft,is an energy conversion component.Based on the features of isobaric surfaces,a pressure distribution model of the nozzle inner wall is built by utilizing the principle of conservation of energy.Simulation and experimental studies are carried out to investigate the inner wall pressure distributions of two kinds of nozzles(cylindrical nozzle,conical nozzle).Comparison analyses are performed among the results of the model,the simulation and the experiment.The results show ① the pressure decreases sharply near the outlet of the nozzle and the larger the diameter,the smaller the pressure gradient;② the pressure gradient of the cylindrical nozzle is larger than that of the conical nozzle;③ the pressure distribution can be well reflected by the model.