Design Optimization And Flow Field Analysis Of High-Speed Axial Piston Pump

The high-speed axial piston pump is the core element of the aviation hydraulic system,and under high-pressure and high-speed working conditions,the oil is stirred at high speeds,resulting in significant churning losses that directly affect its efficiency and reliability.Therefore,this study focuses on reducing the churning losses of the high-speed axial piston pump through the use of a insert and investigating the flow field inside the pump housing when the insert is installed.By analyzing the flow state of the oil within the housing and establishing an churning loss theoretical model,the design parameters of the insert and the mapping relationship between churning losses and heat dissipation effects are obtained.The optimal design of the insert structure is proposed to improve the efficiency and reliability of the high-speed axial piston pump.Firstly,by comparing different insert structures for the high-speed axial piston pump,a insert structure that is cost-effective and practical and can reduce pump energy loss is identified,providing the foundation of the research.Secondly,the flow field inside the housing of the high-speed axial piston pump with the insert installed is studied.The rules of oil churning losses with speed changes and the churning losses generated by the rotational components of the pump in the oil are analyzed.A theoretical model of churning losses for the high-speed axial piston pump with the insert installed is established to guide the design of the insert flow path.Thirdly,a numerical simulation model of the flow field inside the pump housing with the insert installed is established.The fluid domain of different insert flow paths is simulated,and the simulation results are compared in terms of flow field streamline maps,temperature fields,and churning loss torque data.The insert flow path shape that is superior to the smooth cylindrical insert is selected.The churning loss concentrated parameter model is improved using the simulation results,and the genetic algorithm toolbox of MATLAB is used to solve the churning loss concentrated parameter model,obtaining the optimal design of the insert flow path shape.Finally,a simulated pump structure is designed to eliminate the difference in friction pair dry working condition torque values.The optimized insert flow path design is tested on a high-speed axial piston pump test bench,and the experimental data is compared with the simulation results,verifying the feasibility of the genetic algorithm optimized insert flow path design and providing a method and ideas for optimizing the insert flow path design.