| There are a lot of resources in the ocean,and with the continuous development of land resources,the aircraft are gradually being applied to marine exploration and development.Most of the existing aircrafts use the propeller as the power drive,however,the propeller has the disadvantages of being easily overloaded and easily cavitation,people start to develop the water jet propulsion device to solve the problems of the propeller.Based on the principle of water jet propulsion,this paper designs and researches a new type of hydraulic jet propulsion device.First of all,according to the principle of water jet propulsion,the general plan of the new type of water jet propulsion device for the aircraft was determined.The determination of the total layout of the aircraft mainly determines the maximum resistance of the aircraft through determination of the craft’s shape,and then determines the layout scheme of the booster pump.The layout of the aircraft’s spout is determined through the aircraft movement requirements.Secondly,the key parameters of the propulsion device are determined according to the master plan of the aircraft.The key parameters of the propulsion device include the selection of booster pump,the optimal design of the spout,the matching of the solenoid valve and the energy analysis.The matching of booster pump mainly calculates the resistance under three conditions of direct flight,horizontal flight and deep flight by means of computational mechanical simulation.At the same time,the selection of booster pump is confirmed according to the similar theory of aircraft and fluid loss theory.According to the simulation of fluid,the optimal parameters of the nozzle are determined according to the isokinetic core,shrinkage radius and aspect ratio of the nozzle.The optimal parameters of the nozzle are as follows: the nozzle is curved,the radius is 260 mm and the aspect ratio is l/d=0.5,at the same time,the diameter and wall thickness of the three axial nozzles were determined by the calculation formula.The selection of the solenoid valve is determined by the maximum flow and the maximum pressure head of each branch of the pipeline.Finally,the energy is studied and analyzed,and a reference suggestion for energy selection is put forward.Thirdly,according to the hydraulic propulsion device of the aircraft,the movement of the aircraft is studied and analyzed.According to computational mechanics,this paper calculates and analyzes the craft’s straight-line motion and swerve motion,determines the parameters of the speed and resistance parameters of the aircraft’s direct-flight motion and swerve motion.Based on the dynamic equations of the aircraft,Under the condition of the thrust parameter equation,the compound motion is considered,and the motion control equation between two arbitrary points is determined,which lays the foundation for the follow-up hydraulic propulsion system of the aircraft.Finally,the performance of the inflow channel affects the performance of the whole propulsion device.In this paper,the numerical simulation of the inflow channel is carried out by mechanics calculation.The optimal performance parameters of the inflow channel are calculated as the tilting angle is 30,the lip height is 30 mm,water intake is square,lip and slope of the nozzle are second-order Bezier curves with a control point of 0.1. |
