Design Of Power System For Self-Driving Cleaning Vehicle Device And Study Of Fan Nozzle

Clean and tidy car appearance not only improves the image of the city,but also avoids the impact of dust on vehicle safety.Manual car cleaning is common,but it is inefficient and easy to scratch the car body.;Automatic cleaning of the car washing machine is characterized by complex equipment,large footprint,non-removable.Combining with the actual situation,a self-driving car cleaning device is designed.The main principle of the device is to use the drum to overhead the car and transfer the kinetic energy of the car tire to the pump.The purpose of cleaning the car is achieved through the fan-shaped nozzle installed on the spray rack.As the final actuator of the device,the reasonable jet performance of the fan-shaped nozzle is very important to the cleaning effect.Therefore,this paper studies the jet performance of the fan-shaped nozzle by using CFD simulation software FLUENT.The main research contents are as follows:(1)The development of China's automobile industry and the current situation of Huainan car wash industry are analyzed,the differences between domestic and foreign car wash modes are introduced,their advantages and disadvantages are analyzed,and the main research contents of this paper are put forward.(2)In order to clean the car without external power supply,the drum is designed as an energy transfer device,and the pump,belt,cylindrical cam,bevel gear and cleaning system are preliminarily designed and selected.(3)Based on the relevant principles of hydrodynamics and water jet technology,a three-dimensional physical model of slotted sector nozzle was established,and the flow field inside and outside the sector nozzle was analyzed by CFD simulation software FLUENT.On the internal axis of the nozzle,the jet velocity and dynamic pressure increase rapidly,reaching the maximum near the nozzle outlet.On the external axis of the nozzle,the jet velocity decreases slowly and the dynamic pressure decreases rapidly.On the plane which is a certain length from the nozzle origin and perpendicular to the axis of the nozzle,the jet pressure shows a small dynamic pressure near the axis.From the axis to the outside,the dynamic pressure first increases and then increases.The characteristic of reduction.(4)Six different parameters were selected to analyze the influence of these parameters on the jet performance by single variable method.In order to select the optimal cleaning parameters,the orthogonal test method was used to study the optimal parameters.The results show that the displacement of V-shaped groove,the angle of V-shaped groove and the inlet pressure have great influence on the flow rate and impact force,the displacement of V-shaped groove has great influence on the effective cleaning width,and the displacement of V-shaped groove and the angle of V-shaped groove have great influence on the minimum dynamic pressure near the wall axis.Considering all factors,the optimum parameters are selected as the half angle of V-shaped groove is 40 degrees,the offset of V-shaped groove is 0 mm,the ratio of length to diameter of outlet section is 4,and the inlet pressure is 7.5 MPa.Figure [58] table [18] reference [60]...