Simulation Research And Analysis On Underwater Heat Pipe Heat Dissipation System Of Amphibious Vehicle

Amphibious vehicles have excellent maneuverability and can not only drive on land like ordinary vehicles,but also sail on water like ships.Among them,the water speed of amphibious vehicles is an important indicator to measure the performance of amphibious vehicles,and improving its sailing speed is an important development direction in recent years.The sailing speed of amphibious vehicles can be increased in two ways: the first is to increase the speed by reducing the sailing resistance;the second method is to increase the speed by improving the power of the engine,and the engine power is limited by the vehicle.cooling performance.At present,the heat dissipation capacity of the heat dissipation system of the amphibious vehicle is difficult to meet the heat dissipation requirements of the engine,and the power performance of the engine is affected.Therefore,it is necessary to study the underwater heat dissipation system of the amphibious vehicle engine.In order to solve the problem that the heat dissipation capacity of the existing underwater heat dissipation system of an amphibious vehicle cannot meet the heat dissipation requirements of the engine,three kinds of heat pipe heat dissipation system for underwater heat dissipation of the amphibious vehicle engine are designed according to the operating parameters and heat dissipation requirements of the amphibious vehicle,which has a certain reference value for improving the heat dissipation capacity of the existing amphibious vehicle and developing a new amphibious vehicle.In order to clarify the influence of the designed heat pipe heat dissipation system on the sailing resistance of the amphibious vehicle,the computational fluid dynamics simulation analysis method is used,and the simulative calculation model of the sailing resistance of the amphibious vehicle is established,and the fluid volume fraction model and the Realizable k-εturbulence model are used to calculate the sailing resistance of the amphibious vehicle.The calculation results show that the heat pipe heat dissipation system will slightly increase the sailing resistance of the amphibious vehicle.In order to analyze the flow field and heat transfer inside the designed heat pipe heat dissipation system,a new computational fluid dynamics simulation analysis method for the heat pipe heat dissipation system was proposed,and the heat pipe heat dissipation system was divided into homogeneous heat dissipation modules,and then the method was used to analyze the heat dissipation module.Single and multiple heat dissipation modules are simulated to obtain the flow field and heat transfer in the heat pipe heat dissipation system.In order to verify the heat dissipation capacity of the designed heat pipe heat dissipation system,a heat dissipation system test equipment was built to test its heat dissipation capacity according to the design scheme of the heat pipe heat dissipation system and the working conditions parameters.The test results verify the correctness of the calculation results of heat dissipation.The heat pipe heat dissipation system can meet the requirements of underwater heat dissipation of the amphibious vehicle engine.Considering the influence of the heat pipe heat dissipation system on the sailing resistance of amphibious vehicles and the cooling performance of the heat pipe heat dissipation system,a better design scheme is selected.